IO2 



LABORATORY MANUAL FOR VERTEBRATE ANATOMY 



nans 



jugal 



maxilla 



suborbitals 



frontal 

 postfrontat 

 postorbitals 

 squamosal 

 parietal 

 preopercular 

 supratemporal 



posttemporal 

 opercular 



nans 





rostal plates 



postfrontal 



spiracle 



parietal 



squamosal 



prespiraculars 

 preopercular 



-spiracular 



spiracle 



parietal 



subopercular 

 opercular 



postspiraculars 

 supratemporals 

 posttemporal 



nasal 

 naris 



adnasal 



ethmonasal 



maxilla 



posttemporal 



parietal 

 squamosal 

 . supratemporals 



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.) 



