214 



W. HAROLD LEIGH-SHARPE 



and Mustelus, nor a pera, which has been defined for Mustelus in 

 Memoir II. On their inner edge, near the tip, is a slot whose 

 cavity leads neither forwards nor backwards. 



The glands of the Batoidei are, as far as this investigation has 

 gone, of the same type. This has already been described in 



Cl.Gl. 



8- 



6- 



2- 



SLa. 



Fig. 15 Torpedo marmorata. CI. Gl., clasper gland; A., apopyle; H., hypo- 

 ^yl^; SI. 1., slot; SI. 2., s\it. 



detail for Raia circularis, q. v.. Memoir I, pp. 260 to 262. Briefly, 

 the gland is an elongated bilobed body, with a longitudinal 

 groove, containing a single row of papillae; superficially it 

 resembles a date-stone and is confined to the dorsal side of the 

 siphon sac. The duct of the siphon is thus also the duct of the 

 gland, and debouches in this and the following genera at thg 



