10 



OniTOOEKAMIS ALBIDA. 



I> cription of an Individual, — Diameter of disk, 9 mm . Width of arm with- 

 out spines, 3 mm -. Length of arm, 32 mm '. Mouth-papilla 1 thirteen to each 

 Fig gg angle, all similar, blunt, rounded, spiniform; the outer ones 



largest, and all standing on the jaws, except the outer one 

 on either side, which touches the side mouth-shield. Mouth- 

 shields longer than broad, oval with a peak inward ; length 

 to breadth, 1.0 : 1. Side mouth-shields meeting within, 

 strongly bent outwards. Under arm-plates hexagonal, with 

 an angle towards each side ; lateral sides re-enteringly 

 curved ; length to breadth, 1 : 1.2. Side arm-plates not 

 prominent, and not meeting either above or below. Upper 

 arm-plates rudely hexagonal, wider than long ; length to 

 breadth, 1 : 2. The first two or three are small, and more or less distorted 

 by the encroachment of irregular supplementary scales or plates. Disk 

 covered with large plates, whereof a portion only arc sur- 

 rounded by smaller ones. On the back and in t lie centre 

 a conspicuous rosette of the six large primary plates, partly 

 separated by some minute ones; from these radiate single 

 lines of plates in each interbrachial space, separated by 

 smaller ones from the radial shields. The interbrachial 

 spaces below are covered by large imbricated plates and wide genital scales. 

 Radial shields wide, triangular, strongly diverging, touching by their outer 

 ends; separated by a wedge of a large and a small scale ; length to breadth. 

 2.1: 1.8. Ann-spines four, short, rounded, tapering, of about equal lengths, 

 1.2 mn \ Tentacle-scales rounded, standing close together on the side arm- 

 plate; and outside them is a lip or little ridge. 

 Color, in alcohol, white. 



Hassler Expedition j Barbadoes, LOO fathoms. Dr. William Stimpson j Cape 

 San Antonio, ( iuba, 1- I fathoms. 



Fig. 86. 



Ophioceramis albida. 



Amphgfhotu albida, Ljcitoman. Ophinroidea Vlventla, 81 1. 



PL ///. /. MSI. 



Many specimens which agree with the descriptions and with my notes 

 <m the originals at Stockholm were broughl from moderate depths in the 

 neighborhood of Rio La Plata. A- Ljungman has suggested, the species 

 comes under Ophiocer 



