222 TRANSACTIONS OF THE AMERICAN PHILOSOPHICAL SOCIETY 



'' - f-occ.con 



„ ^ phar.br 



p phar.Br.inf 



Tylosu 



rus 



Fig. 100. Tylosurus acus. Details of skull. A. Top view. B. Top view of occiput much enlarged. C. Posterior view 

 of pharyngo-branchials. 



fr sphpf -^r" ^^ ^pM 



Halocypselus evolans 



Fig. 101. Halocypsflus evolans. 



