MAMMALIA 



California Mammals 



Class Mammalia. Mammals 



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

 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 corpuscles; 

 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. 



Sulxlass Monodelphia. 



Anterior cerebral commissure small; corpus callosum large; 

 episternum wanting ; coracoid very 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 hori-zontally ; 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 larg-e 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, pul> 



