GREGORY: FISH SKULLS 



399 



these have perhaps enveloped or replaced the great horn-like spike of Jntennarius, which 

 represents the second dorsal fin-ray. In this species the forward growth of the pseudo- 

 rostrum has necessitated the bracing and readjustment of all the supporting bone beneath it. 

 Thus the orbital rims of the frontals have been stiffened and the lateral ethmoid ridges have 

 been greatly strengthened and rotated forward; 



(4) possibly the forms with a short rostrum have been derived from those with a 

 long rostrum, such as Ogcocephalus vespertilio; 



meth 

 ^- a*vt /orvc./r 



Chaunax coloratus 



Fig. 271. Chaunax. After Garman. A. Side view of skull. B. Front view of fish. C. Top view of skull. 



(5) the mouth parts of the sea-bats are relatively small and apparently have been 

 derived by reduction from a more normal condition. Nevertheless the premaxillae retain 

 long ascending processes, which pass upward between the maxillae in the normal way; 



