AET. 15 ANATOMY OF THE EARED AND EARLESS SEALS HOWELL 101 



MUSCLE DIFFERENCES 



Before the discussion of the functional differences between the 

 Otariidae and Phocidae is undertaken it will be necessary to digest 

 the more significant of the muscle differences and to tabulate them 

 in condensed form, so that the variations may the more easily be 

 grasped. Certain of the myological differences between the animals 

 dissected are of such a character that it is difficult to compare them 

 in words, especially concisely. Many of the muscles showing slight 

 differences or of a character which are deemed relatively unimpor- 

 tant are omitted from the table and from the discussion. It is de- 

 sirable to match muscular conditions of the Pinnipedia with one 

 of the fissipeds, and solely because the domestic cat is far better 

 know^n than any other this is selected for the purpose, and the 

 nomenclature of its muscles reduced to terms comparable to those 

 used for the pinnipeds. In the following table, then, those muscles 

 are listed which have been found to differ in their origins or inser- 

 tions, and the conditions in the cat (C) are given, followed by those 

 in Zaiophus (Z) and the Phoca (P), 



