202 



W. HAEOLD LEIGH-SHARPE 



The male examined is 68 cm. in length, the fish in each sex 

 being measured to the extremity of the whip-like tail. The 

 claspers are not obvious, being covered in the natural position 

 by the pelvic fins, as seen on the (observer's) right in figure 3. 



16 



-12 



cm. 



Fig. 2 Pristiurus melanostomus. A., apopyle; H., hypopyle; S., siphon; 

 Bh., rhipidion. 



They are of a type wholly different from Callorhynchus and the 

 elasmobranchs, since each bifurcates into an external and an 

 internal radius. At the bifurcation of the radii is the apopyle. 

 Whilst the fish is very smooth, the clasper radii are fiercely 

 denticled, though lacking at the tip the dermal hooklets so 

 characteristic of the fossil Squaloraja (Memoir III, p. 193). 



