ANATOMY or THE EARED AND EARLESS SEALS HOWELL 



83 



flie most medial of the divisions and also small. It arose apparently 

 from the last three lumbars and inserted slenderly upon the pectineal 

 process. Conditions have been essentially similar in the other pin- 

 nipeds dissected, including a small Phoca vituliTm by Miller; but in 

 tlie cjise of a large specimen of this species the same author stated 

 that this muscle was enormous and much larger than the psoas major, 

 M"hich seems to indicate that an error was made in either one o^ 

 the other. 



M. psoas magnus (tigs. 11, 12, 13, 24) in the Zalophus was less robust 

 at the original but larger at the insertional end than the minor 



raUAD. LUWB 



■PS.Q^S 3^ 



— ?SO^S /A\MOK 



'PSOAS fANGNUS. 



IL1ACU?>. 



5ABT0BIUS 

 RECTUS FEJ-NOT^iS' 

 ?ECT1ME-US 

 ADDUCTOTt ANTICU5 

 ADDUCTO'RELS 

 ADDUCTOTT POSTICUS 



&EME.L. IHFEK 

 SEfA\TEJHD(NOSUS> 



SEfAi rAE^^BR^Nos'JS 



k 



Fig. 24. — Ventral aspect of the muscles extending from the 

 in.vomin'ate boxe (stippled) to the posterior limb of za- 

 LOPHUS (Z) AND PHOCA HISPIDA (P) 



division. Origin was from the last two lumbars and the extreme 

 anterior sacrum. It passed beneath (dorsad of) the minor and be- 

 tween the rectus femoris and pectineus, and inserted tendinously 

 upon the lesser trochanter. It is difficult to understand the condi- 

 tions in Miller's A'/'ctocephalus^ or in his other pinnipeds for that 

 matter. In my Phoca there was no difficulty about the insertion 

 which was with the iliacus upon the medial tuberosity of the tibia. 

 In this tender specimen, however, origin was entirely inseparable 

 from a great mass of muscle extending from the thorax to insert 

 chiefly upon the ventral part of the medio-cranial face of the ilium. 

 About any such insertion in his specimens ^Miller mention'^ nothing. 



