102 



LABORATORY MANUAL FOR VERTEBRATE ANATOMY 



nesethmoid 



premaxilla 

 ad nasal 

 nasal 

 maxilla 

 orbit 

 frontal 

 postorbital 



post temporal 

 opercular 



prespiraculars 

 preopercular 



spiracular 

 spiracle 

 parietal 

 subopercular 

 opercular 



postspiraculars 

 supra temporals 

 posttemporal 



ClfC-jk nasal 



*) CJ naris 



rostal plates 



prefrontal 



frontal 



orbit 



posttemporal 



posttemporal 



Fig. 34. — Dermal scales (superficial bones of the skull) of the head of some ganoid fishes. A } 

 Amia. B, Polypterus. C, sturgeon (Acipenser). D, gar pike (Lepidosteus). The arrangement of 

 some of "these scales, which in teleosts become the bones of the dorsal surface of the skull, greatly resembles 

 that of the dorsal skull bones of the land vertebrates, and these scales have received the same names 

 as the skull bones, although the strict homology is doubtful. (After Goodrich in Part IX of Lankester's 

 Treatise on Zoology, courtesy of the Macmillan Company.) 



