102 



LABORATORY MANUAL FOR VERTEBRATE ANATOMY 



Darts 



postfrontal ~~f~i 

 postorbitals S^L. 



squamosal L^ 



parietal 

 preopercular 

 supratemporal 



post temporal 

 opercular 



mesethmoid 

 premaxilla 

 adnasal 

 nasal 

 maxilla 

 orbit 

 frontal 

 postorbital 



.prespiraculars 

 preopercular 



-spiracular 

 spiracle 

 parietal 

 subopercular 

 opercular 



postspiraculars 

 supratemporals 

 posttemporal 



rostal plates 



prefrontal 

 frontal 



orbit 

 supraorbital 



postfrontal 



spiracle - 

 parietal 



squamosal 



opercular 

 supratemporal 



dermal 



occipitals 



posttemporal 



nasal 

 naris 



adnasal 

 ethmonasal 



maxilla 



frontal 



supraorbitals 



orbit 

 postfrontal 



preoperculars 

 (cheek plates) 



parietal 

 squamosal 

 . supratemporals 



opercular 

 epiotic 



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 (Lepidostcus). 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.) 



