THE ELASMOBRANCH PISHES 



61 



Fig. 68. Crauiiim of lUiinohatis productus, lateral view. (Chester vStoek, orig.) 



Fig. 69. Skull of liaja clavata (articulate). (Modified from W. K. Parker.) 



a.pr., antorbital process; f-II, optic foramen; f.IV, trochlear foramen; f.VII, foramen 

 for hyomandibular l^ranch of facial nerve; Ji.md., hyomandibula; 7)id., mandible; o.f., orbi- 

 tal fissure; po.o., postorbital process; p-q., palatoquadrate ; pr.o., preorbital process; s.o., 

 supraorbital crest; sp.c, spiracular cartilage. 



