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 neighborbood. 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, 
