Virtual Museum of Art | Virtual Museum of History | Virtual Public Library | Virtual Science Center | Virtual Museum of Natural History | Virtual War Museum
   You are in: Museum of Natural History >> Aquatic Hall >> DOLPHINS





American’s Four United Republics: Discovery-Based Curriculum

For More Information go to America's Four United Republics Curriculum


 


Delphinida.—This family includes the Dolphins, Porpoises, and Narwhal, and is characterized by usually possessing teeth in both jaws

 

Delphinida.—This family includes the Dolphins, Porpoises, and Narwhal, and is characterized by usually possessing teeth in both jaws : the teeth being numerous, and conical in shape. The nostrils, as in the last family, are united, but they are placed further back, upon the top of the head. The single blow-hole or nostril is transverse and mostly crescentic or lunate in shape. The head is by no means so disproportionately large as in the former families, usually forming about one-seventh of the entire length of the body.

Dolphin illustration copyright Stanley L. Klos

Fig. 214.—The common Dolphin (Jielphinus delphis).

The most noticeable members of this family are the true Dolphins, the Porpoises, and the Narwhal.

The Dolphins have an elongated snout, separated from the head by a transverse depression. The common Dolphin (Delphinus ddphis, fig. 214) is the best-known species. It averages from six to eight feet in length, and has the habit of swimming in flocks, often accompanying ships for many miles. The female, like most of the Cetacea, is uniparous. The Dolphin occurs commonly in all European seas, and is especially abundant in the Mediterranean.

The common Porpoise (Phocana communis) is the commonest and smallest of all the Cetacea, rarely exceeding four feet in length. The head is blunt, and is not produced into a projecting muzzle. The Porpoise frequents the North Sea, and is commonly seen off our coasts. Another British species is the Grampus (Phocana orca), but this is much larger, attaining a length of from eighteen to twenty feet. Nearly allied to the Grampus is the so-called "Caing" Whale, or, as it is sometimes termed, the " Bottle-nosed" Whale (Globicephaltts or Phoaena globiceps). This species occurs not uncommonly round the Orkney and Shetland Islands, and attains a length of as much as twenty-four feet . It is gregarious in its habits, and is often killed for the sake of its oil.

 

Dolphin Birth

Closely allied to the true Dolphins are two curious Cetaceans, belonging to different genera, but both inhabiting fresh waters. One of these is the Gangetic Dolphin (Platanista Gangetica), which inhabits the Ganges, especially near its mouth. This singular animal is characterised by the great length of its slender muzzle, and by the small size of the eyes. It attains the length of seven feet, and the blow-hole is a longitudinal fissure, and therefore quite unlike that of the typical Delphinida. The other fresh-water form is the Inia Boliviensis, which inhabits the rivers of Bolivia, and is found at a distance of more than two thousand miles from the sea. In its essential characters it differs little from its marine brethren, and it attains a length of from seven (female) to fourteen feet (male). The last of the Ddphinida is the extraordinary Narwhal or Sea-unicorn (Monodon monoceros). The Narwhal is an inhabitant of the Arctic seas, and attains a length of as much as fifteen feet, counting in the body alone. The dentition, however, is what constitutes the great peculiarity of the Narwhal. The lower jaw is altogether destitute of teeth, and the upper jaw in the females also exhibits no teeth externally, as a general rule at any rate, though there are two rudimentary incisors which do not cut the gum. In the males, the lower jaw is likewise edentulous, but the upper jaw is furnished with two molar teeth concealed in the gum, and with two incisors. Of these two upper incisors, that of the right side is generally rudimentary, and is concealed from view. The left upper incisor, on the other hand, is developed from a permanent pulp, and grows to an enormous size, continuing to increase in length throughout the life of the animal. It forms a tusk of from eight to ten feet in length, and it has its entire surface spirally twisted. As an abnormality, both the upper incisors may be developed in this way so as to form projecting tusks; and it is stated that the tusk is occasionally present in the female. The function of this extraordinary tooth is doubtless offensive. - Manual of Zoology  by HENRY ALLEYNE NICHOLSON edited by Stanley L. Klos.

 


Start your search on DOLPHINS.


America's Four United Republics Exhibit - Click Here


Unauthorized Site: This site and its contents are not affiliated, connected, associated with or authorized by the individual, family, friends, or trademarked entities utilizing any part or the subject's entire name. Any official or affiliated sites that are related to this subject will be hyper linked below upon submission and Evisum, Inc. review.

Copyright© 2000 by Evisum Inc.TM. All rights reserved.
Evisum Inc.TM Privacy Policy

Search:

About Us

 

 

Image Use

Please join us in our mission to incorporate America's Four United Republics discovery-based curriculum into the classroom of every primary and secondary school in the United States of America by July 2, 2026, the nation’s 250th birthday. , the United States of America: We The People Click Here

 

Childhood & Family

Click Here

 

Historic Documents

Articles of Association

Articles of Confederation 1775

Articles of Confederation

Article the First

Coin Act

Declaration of Independence

Declaration of Independence

Emancipation Proclamation

Gettysburg Address

Monroe Doctrine

Northwest Ordinance

No Taxation Without Representation

Thanksgiving Proclamations

Mayflower Compact

Treaty of Paris 1763

Treaty of Paris 1783

Treaty of Versailles

United Nations Charter

United States In Congress Assembled

US Bill of Rights

United States Constitution

US Continental Congress

US Constitution of 1777

US Constitution of 1787

Virginia Declaration of Rights

 

Historic Events

Battle of New Orleans

Battle of Yorktown

Cabinet Room

Civil Rights Movement

Federalist Papers

Fort Duquesne

Fort Necessity

Fort Pitt

French and Indian War

Jumonville Glen

Manhattan Project

Stamp Act Congress

Underground Railroad

US Hospitality

US Presidency

Vietnam War

War of 1812

West Virginia Statehood

Woman Suffrage

World War I

World War II

 

Is it Real?



Declaration of
Independence

Digital Authentication
Click Here

 

America’s Four Republics
The More or Less United States

 
Continental Congress
U.C. Presidents

Peyton Randolph

Henry Middleton

Peyton Randolph

John Hancock

  

Continental Congress
U.S. Presidents

John Hancock

Henry Laurens

John Jay

Samuel Huntington

  

Constitution of 1777
U.S. Presidents

Samuel Huntington

Samuel Johnston
Elected but declined the office

Thomas McKean

John Hanson

Elias Boudinot

Thomas Mifflin

Richard Henry Lee

John Hancock
[
Chairman David Ramsay]

Nathaniel Gorham

Arthur St. Clair

Cyrus Griffin

  

Constitution of 1787
U.S. Presidents

George Washington 

John Adams
Federalist Party


Thomas Jefferson
Republican* Party

James Madison 
Republican* Party

James Monroe
Republican* Party

John Quincy Adams
Republican* Party
Whig Party

Andrew Jackson
Republican* Party
Democratic Party


Martin Van Buren
Democratic Party

William H. Harrison
Whig Party

John Tyler
Whig Party

James K. Polk
Democratic Party

David Atchison**
Democratic Party

Zachary Taylor
Whig Party

Millard Fillmore
Whig Party

Franklin Pierce
Democratic Party

James Buchanan
Democratic Party


Abraham Lincoln 
Republican Party

Jefferson Davis***
Democratic Party

Andrew Johnson
Republican Party

Ulysses S. Grant 
Republican Party

Rutherford B. Hayes
Republican Party

James A. Garfield
Republican Party

Chester Arthur 
Republican Party

Grover Cleveland
Democratic Party

Benjamin Harrison
Republican Party

Grover Cleveland 
Democratic Party

William McKinley
Republican Party

Theodore Roosevelt
Republican Party

William H. Taft 
Republican Party

Woodrow Wilson
Democratic Party

Warren G. Harding 
Republican Party

Calvin Coolidge
Republican Party

Herbert C. Hoover
Republican Party

Franklin D. Roosevelt
Democratic Party

Harry S. Truman
Democratic Party

Dwight D. Eisenhower
Republican Party

John F. Kennedy
Democratic Party

Lyndon B. Johnson 
Democratic Party 

Richard M. Nixon 
Republican Party

Gerald R. Ford 
Republican Party

James Earl Carter, Jr. 
Democratic Party

Ronald Wilson Reagan 
Republican Party

George H. W. Bush
Republican Party 

William Jefferson Clinton
Democratic Party

George W. Bush 
Republican Party

Barack H. Obama
Democratic Party

Please Visit

Forgotten Founders
Norwich, CT

Annapolis Continental
Congress Society


U.S. Presidency
& Hospitality

© Stan Klos

 

 

 

 


Virtual Museum of Art | Virtual Museum of History | Virtual Public Library | Virtual Science Center | Virtual Museum of Natural History | Virtual War Museum