170 



Annals of the Carnegie Museum. 



Raja hinoculata may be easily separated from all other rays found 

 on the western coast from San Diego to Puget Sound by the compara- 

 tively shallow notch in the posterior edge of the ventrals. From 

 seventy-five to one hundred specimens were observed, and this char- 

 acter was not found to vary materially betweenindividuals just hatched 

 and those over six feet in length. When the outer edge of the ventral 



Fig. 3. Raja binoculata. Male. 52 in. long. From Puget Sound. 



fin is held so that it extends at a right angle with the inner edge, the 



notch in the posterior edge almost disappears. In treating the ventral 



of the other species in the same way a deep rounded notch remains. 



The rostral cartilages join only at their anterior fourth, while in Raja 



