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W. HAROLD LEIGH-SHARPE 



together, but here and there two or three papillae are passive, I 

 gather that all the gland components are not in a state of 

 activity simultaneously. I regret I have not obtained such 

 results as yet in R. circularis. 



Fig. 19 Raia blanda, the right clasper in, A., the normal position, B., the 

 erect position. A., apopyle; H., hypopyle; Rh., rhipidion; Ps.. pseudosiphon; 

 Sg., signal; S/i.. shield; 5/i., sentinel; *Sp., spike; St., sentina. 



I have not yet met with skates in copula, but a reliable au- 

 thority informs me that in these larger species only one clasper 

 is inserted at a time. 



The specimens of R. clavata were from We^anouth, Plymouth, 

 and other parts of the English Channel. 



