360 



W. HAROLD LEIGH-SHARPE 



The present memoir deals with the following species: 



1. Galeus vulgaris 360 



2. Mustelus vulgaris 365 



3. Lamna cornubica 367 



4. Rhina squatina 373 



16 



14 



12 



lO 



Fig. 1 Galeus vulgaris, with an enlarged view of the terminal portion of the 

 clasper to the right. S., siphon; //., hypopyle; Ps., pseudosiphon; Fl., flap; Rh., 

 rhipidion. 



GALEUS VULGARIS 

 The toper or tope 



In both Galeus and Mustelus the siphons attain enormous 

 dimensions. In the specimen of Galeus vulgaris taken at 

 Plymouth in July, 1918, upon which the following observations 



