376 



SYSTEMATIC ZOOLOGY 



is one of the commonest baleen whales. It migrates southward 

 during the autumn and northward in the spring. In the winter 

 the females enter lagoons along the shore to bring forth their 

 young. These whales are from twelve to thirteen meters in 

 length. Another whale of interest which occurs in the Pacific 

 off the coast of California is the sulphur-bottom, interesting 

 because it is the largest living animal ; it is said to attain a 



Fig. 368. Balaiia mystecetus, the whalebone wtiaie ; skull with whalebone. (From Claus 



and Scugwiuk's Text-book.) 



length of about thirty meters. The whale which has been the 

 longest hunted, and yields the most oil and the most and best 

 whalebone, is the Greenland whale or bowhead. A good-sized 

 individual of this species measures fifteen meters in length, 

 though they have been taken nearly twenty meters long. It 

 lives only in icy waters. The right whale of the North Pacific 

 is a trifle larger, and is also extensively hunted. 



Order 4. Ungulata 



The Ungulata ( Lat. itngula, claw or hoof) have the digits, of 

 which there may be from one to five, provided with horny hoofs 

 or blunt nails. They include such types as the horse, tapir, 

 rhinoceros, pig, camel, deer, cattle, and the elephant. All are 

 terrestrial animals except the hippopotamus, which is amphibious 

 in habit, and almost all are herbivorous. The teeth are hetero- 

 dont, but the dentition is often incomplete, some teeth being 

 absent from one or both of the jaws, and the clavicle is usually 

 lacking. The Ungulata are sometimes divided into two groups, 

 the first or true Ungulata comprising all the animals with well- 

 developed hoofs, either entire or cloven, and the second consist- 



