﻿OPIIIOPIIRAGMUS. 



131 



This species is distinguished from A. geminata by the shape of the 

 mouth-sliields and of the upper and lower arm-plates, and in having the 

 mouth-papilljE of the same size ; from A. chilensis, by having two 

 tentacle-scales instead of one. 



No. 1063 is from Puget Sound, and may be another species. The 

 spines are blunter, the under scales of the disk larger and less crowded, 

 and the under arm-plates rather more rounded. More specimens will 

 settle the question. 



LIST OF SPECIMENS. 



Whence obtained. 



230 

 354 



3luseum of Comparative Zoology. 



12+ 



California. 

 Mendocino, Cal. 

 Monterey, Cal. 

 Gulf of Georgia. 



Smithsonian Institution. 



Puget Sound. 

 Monterey, Cal. 



Alex Agassiz. 

 Mr. Sayla. 

 Alex. Ajiassiz. 



Dr. Kennerly. 

 Mr. Sayla. 



OPHIOPHRAGMUS* Lyman. 



Disk small and delicate, furnished with uncovered radial shields, and 

 covered with naked scales ; the scales along the edge of the disk are 

 turned up, so as to make a little fence. Teeth. No tooth-papilla3. Six 

 mouth-papilliE to each angle of the mouth. Arms slender, even, more 

 or less flattened. Arm-spines short and regular, arranged along the 

 sides of the side arm-plates. 



O^ts, snake ; ippayfxos, hedge. 



