SEXUAL CHARACTEES — ELASMOBRANCH FISHES 



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a raspberry-shaped protuberance, grooved on the outer side of 

 the middle Hne, owing to the presence of a raised external fleshy 

 pad, and bearing attenuated, movable, dermal hooklets, as 

 shown in the inset, strikingly like those of the fossil Squaloraja 



8- 



cm. 



Fig. 13 Rhinochimaera atlantica. CL, posterior clasper; Cav., position of 

 cavity of clasper; Ant. CL, anterior clasper; Pch., pouch of anterior clasper; 

 D. H., dermal hooklets; R., enlarged view of the posterior (distal) end of the 

 right clasper. 



(Memoir III, fig. 3). The hooklets, which point anteriorly, and, 

 when not erected, lie flat against the protuberance, appear to 

 be more numerous than in Squaloraja, there being at least six 

 principal ones on each side of the groove, besides other minute 

 subsidiary ones which grade into scale-like forms; doubtless, 

 some are not preserved in the fossil. There is no frontal clasper. 



