SEXUAL CHARACTERS ELASMOBRANCH FISHES 



MYLIOBATIS AQUILA 



217 



The eagle-ray 



The specimen investigated (fig. 19), captured at Madeira, 

 measures 75 cm. in length and 46 cm. at the greatest breadth 

 across the pectoral fins. The flesh of the inner edge of the clasper 



C1.G1. 



Fig. 19 Myliobatis aquila. CI. Gl., clasper gland; H., hypopyle; Pe., pent; 

 Rh., rhipidion. 



is drawn up into a ridge-like fold, the pent, not so pronounced as 

 in Trygon. The clasper is stouter, but otherwise resembles 

 Trygon more closely than any other two genera approximate to 

 each other. The rhipidion is situated more anteriorly, but 

 resembles that of Trygon in being hard and shell-hke with a 

 knife-blade edge. The clasper gland is as in Torpedo (fig. 20). 



