﻿OPIIIOULYPIIA NODOSA. 



49 



Ophioglypha albida Lyman. 



Opliiura texturata, 2 eadem minor albida (?) Lamk. Illst. Anim. s. Vurt, II. p. 542. 181G. 

 Ophiura albida Fokbes. Wcrn. Trans., VIII. p. 125. 

 Ophiura albida Forbes. Brit. Starfishes, p. 27. 

 Ophiura albida Lutke.v. Addit. ad Illst. Opli., p. 39. 



LIST OF SPECIMENS. 



Whence obtained. 



Museum of Comparalive Zoijlor/y. 



Faroe Islands. 

 Kattegat and Orcsund. 

 Norway. 



University Museum, 



CopenliaMn. 

 University Museum, 



Copenhagen. 

 University Museum, 



Copenhagen. 



Ophioglypha nodosa Lymax. 



Ophiura nodosa Lutkex. Vidensk. Meddelelser. Nov., 1854. 

 Ophiura nodosa LDtken. Addit. ad Hist. Oph., p. 48. 



Special Marks. — Primary plates irregular in form, but regularly 

 arranged ; disk thick ; arms often twice the diameter of the disk ; arm- 

 spines one, two, or three, separated from the tentacle-scales. 



Description of a Specimen. — Diameter of disk, 7"" ; from outer 

 side of mouth-shield to outer corner of opposite mouth-slit, 4..3'""' ; width 

 of arm without spines, 2""- ; length of arm, 9.5°"°- ; distance from outer 

 side of mouth-shield to inner points of mouth-papilla, to that between 

 outer corners of mouth-slits, 2.9 : 1.5. Mouth-papillsB, ten to each angle 

 of mouth ; short, flat, stout, blunt, set close together, those within nar- 

 rower than the outer ones. Teeth four, remarkably short, resembling 

 mouth-papillas, flat, stout, with a curved cutting edge. Mouth-shields 

 broader than long, cleanly rounded without, and more or less tapering 

 inwards ; length to breadth, 1.6 : 1.2. Side mouth-shields very narrow, 

 occupying only the inner end of mouth-shields ; Avhere they meet 

 within, they make an angle, and run still farther inwards, side by side. 

 Under arm-plates rapidly lessening in size towards the tip of the arm ; 

 narrow, swollen, rounded without, tapering inwards ; first plate largest 

 of all, triangular, with one angle inward, stout, somewhat swollen ; 

 length to breadth, .9 : .9 ; second plate rather smaller, squarish, with 

 rounded comers ; beyond this the plates grow more and more rounded 



7 



