﻿0P1II0LEPI8 PAUCISPINA. 



57 



Radial shields irregular, rounded, triangular, rather larger than primary 

 plates ; length to breadth, .9 : .5 ; they are separated without by a 

 broadly triangular group of three scales, of which the two outer ones 

 are two or three times as large as the inner one, and within by a group 

 of little scales, in the midst of which stands the outermost primary 

 plate of the brachial row. Intei^brachial spaces below closely covered 

 with large scales similar to those above, but rather smaller and flatter ; 

 between these there are some little angular scales, which, however, do 

 not completely separate them. Arm-spines two, stout, rounded, taper- 

 ing, extremely short ; length less than .2""'-. Tentacle-scales two ; near 

 tip of arm only one ; stout, thick, set close together, and forming an 

 oval figure. Color, in alcohol : below, whitish ; above, yellowish white, 

 with some bands of dark greenish on the arms, and a few markings of 

 the same color on the disk. 



Variations. — The arms generally are not more than twice the diam- 

 eter of the disk in length ; the largest specimen I have seen had a disk 

 of 7"° , and arms of 14.5""°-. I have seen none smaller than 3.8°""- ; and 

 this one showed all the adult characters, except that the inside tentacle- 

 scale was not fully developed. The color of the living animal is said to 

 be yellowish, reddish, or grayish, with dark-green arm-bands. 



This species has been found by Mr. Riise at St. Thomas, and by Prof 

 Agassiz and Mr. Wurdeman on the coast of Florida, Avhere Say, also, 

 originally discovered it. It differs from other species in having only 

 two very short arm-spines. 



LIST OF SPECIMENS. 



Original Number 



Whence obtained. 



204 

 205 

 206 



Museum of Comparative Zoology. 



St. Thomas, W. I. 



Florida. 



West Indies. 



Cape Florida. 



Smithson 

 4 St. Thomas, W. I. 

 3 St. Thomas, W. I. 

 2 St. Thomas, W. I. 



Apr. 



A. H. Riise. 

 G. Wurdeman. 

 University Museum, 



Copenhagen. 

 G. Wurdeman. 



A. H. Riise. 

 A. H. Riise. 

 A. H. Riise. 



