230 



W. HAROLD LEIGH-SHARPE 



be expected of a genus surviving from so geologically ancient 

 times. •* 



Situated in the clasper, anterior to the apopyle and leading 

 posteriorly into it, is a blindly ending cavity whose boundaries 

 are indicated by a dotted line in figure 10, and which is much 

 more simple than that of Notidanus, and on about the same 

 developmental level as that of Callorhynchus. 



Cav 



'^J 



Fig. 10 Cestracion philippi. A., apopyle; Hi/., position of hypopyle; Ha., 

 hamus; Cr., crumena; Rh., rhipidion; Cav., boundary of cavity of the clasper 

 indicated in dotted outline; S., siphon. 



PRISTIOPHORUS CIRRATUS 



The saw-fish shark 



A mature specimen of this species, taken at Tasmania in 1885, 

 was examined, 109 cm. in length, a portion of the anterior end 

 of the saw having been broken off and not included in this 

 measurement. 



As regard the claspers and their accessory structures, this 

 animal bears a surprising likeness to Cestracion, although their 



