MAMMALIA 11 



California Mammals 



Class Mammalia. Mammals 



Young- born alive and nourished by milk secreted in mammas ; 

 lungs and heart contained in a thorax separated from the ab- 

 dominal viscera by a diaphragm ; heart four chambered ; circula- 

 tion complete; blood warm, with red non-nucleated coi-puscles; 

 body usually covered with hairs; mouth usually furnished with 

 teeth ; never more than two pairs of limbs, both pairs always pres- 

 ent except in some aquatic species. 



Subclass Monodelphia. 



Anterior cerebral commissure small; corpus callosum large; 

 episternum wanting ; coracoid vei-y feebly developed, not con- 

 nected with a sternum; urogenital and intestinal openings not 

 combined ; a placenta ; young well developed when born. 



Order Cete. 



WHALES, DOLPHINS, PORPOISES, ETC. 



Fore limbs fin-like, without distinct fingers and without 

 nails; hind limbs absent; pelvis rudimentary; no clavicles; tail 

 widened horizontally ; neck short, the vertebrae more or less fused ; 

 nostrils opening on top of the head as spiracles ; eyes small ; no 

 external ear; skin hairless; habitat marine. 



Cetaceans are mammals that are fishlike in form and adapted 

 to life in oceans, seas and large rivers. Like all mammals cet- 

 aceans breathe by means of lungs and suckle their young, which 

 are born well developed. 



The only book containing full and accurate accounts of the 

 habits of our species is the "Marine Mammals of the Northwest- 

 ern Coast of North America," by Captain C. M. Scammon, pub- 



