AET. 15 AXATOMY OF THE EAEED AND EAELESS SEALS HOWELL 11 



ventrad almost paper thin, allowing the animal to look straight up 

 with ease. In some of the Phocidae (as StenorhyncKus) the inter- 

 orbital septum is not more reduced than in the sea lion, the skull is 

 long and narrow and the orbit is not especially large. In the Phoca 

 Mspida, as previously mentioned, the zygomatic width is relatively 

 great and the orbit proper, large. The size of the eye has resulted 



premax . 



TmPORAUS 

 HHOfAB. WTIC 

 SEfA (SPIN. CAR 

 OBUa. SUPER 

 PECT CAT? POST ACCES?i.- 



CtPHMWUt^tHN\. 

 p- VAUIAE.V\0TRKPEX\U5 



RtcT.Cfp.posT. ^^^3. 



RtCTXKP. POS>T.rA\HOR 



occipital 



Fig. 3. — Doksal view of the skdll of Phoca hispida, showing areas of muscle 

 attachments and (in small type) names of bones 



in the forcing caudad of the postorbital process of the zygoma to a 

 point immediately caudad of the malar-squamosal suture, while in 

 Zaiophus (and some phocids, as Stenorhynchus) this process is 

 located considerably craniad of this suture. 



Within the orbit it is seen that the excessive thinness of the inter- 

 orbital septum of Phoca hispida has crowded the ethmoturbinals to 



