SQUALID^. 



157 



Notidanus (Cut.). One dorsal, over the anal ; 

 teeth of the upper jaw triangular, of the lower jaw 

 saw-like ; six gill-openings. 



N. griseus. Fig. 233 ; ^n.s. 



233 



234 



235 



Mustelus (Cuv.). Smooth Hound. As Galeus, 

 but the teeth are flat, as in the Raiada. 



M. leevis. Fig. 234 ; ^ n. s. 



Zyg(B7ia (E-isso). Hammer-head, Head flat 

 produced on each side, with the eyes at the ex- 

 tremities ; fins as in Galeiis. 



Z. malleus. Fig. 235 ; -^^ n. s. 



