Fig. 79. 



Figs. 79 and 80.— The skull of Squatina viewed from above (Fig. 79), and from the side 

 (Fig. 80). — a, vomerine region ; b, prefrontal ; c, post-orbital ; d, post-auditory pro- 

 cesses ; c, occipital condyles; /, occipital foramen; (J, suspensorium ; A, upper den- 

 tigerous arch; *", k, I, labial cartilages; Afn, mandible; An, auditory chamber; Or, 

 orbit; 2V, nasal chamber ; Op, opercular cartilaginous iilaments ; Br, branchiostegal 

 rays ; Hy, hyoideah arch. 



