MUSEUM OF COMPARATIVE ZOOLOGY. 237 



If it is found to be the case that the rostral cartilage remains undeveloped 

 in larger specimens, this species will have to be placed in the subgenus Mala- 

 corrhina. 



Dasibatis sabina. 



Many of these rays were found among the multitudes of dead fishes along 

 the shores of Key West and islands in the neighborhood. Like the sharks and 

 trunk-fishes (Ostracion) they seemed to possess much more vitality than the 

 majority of the bony fishes. It was not an uncommon occurrence to find them 

 struggling along in a feeble, half-paralyzed way, fully aware of their danger, 

 but unable to make the efforts necessary for escape. In all likelihood they had 

 been swept down from the bays and rivers of the mainland by the currents. 



March 15th, 1881. 



