﻿OPIIIOGLYPIIA STUWITZII. 



LIST OF SPECIMENS. 



51 



Locality. 



Collei 



"Wlience obtiiined. 



7 

 124- 



Museum of Comparative Zuiilogij. 



Greenland. 

 Greenland. 



Greenland. 

 Greenland. 

 Straits of Bellisle. 

 Straits of Bellisle. 



Smithsonian Institution. 

 Greenland. I 



Prof Sars, 1852. 

 University Museum, 



Copenhagen. 

 Prof Sars, 1852. 



A. S. Packard, Jr. 



WiUiams Colle.'e. 



Drieil. 

 Aleoholic. 



University Museum, I 



Copenhagen. Alcoholic. 



Ophioglypha Stuwitzii Ltman. 



OpUura Stuwitzii Lutkex. 

 Ophiura Stmcitzii LiJTKEN. 



Ovei-sigt over Gronlands Echinodermata, p. 51. 

 Addit. ad Hist. Oph., p. 49. 



Special Marks. — Arms very little longer than diameter of disk ; 

 disk thick ; scales on disk irregularly arranged. 



DescrijJtion of a Sjjecimen.* — Diameter of disk, 5"°- ; from outer 

 side of mouth-shield to outer corner of opposite mouth-slit, 2.5""'; width 

 of arm without spines, 1.5""-; length of arm about 5.5°"°-. Mouth-papillaB 

 numerous ; outer ones very small, inner ones tolerably large, sharp, 

 arranged at the mner point of the jaw in a bunch. Mouth-shields much 

 longer than broad, within pointed, rounded without, lateral sides slightly 

 re-enteringly curved ; length to breadth, 1 : .4. Side mouth-shields short 

 and very narrow, meeting within, and occupying the inner angle of the 

 mouth-sliields. Under arm-plates very small, swollen, narrow ; towards 

 the tip of the arm they become smaller and pentagonal. Side arm- 

 plates large, wider above than below, strongly arched, projecting out- 

 ward and sideways, so that there is a deep crease between each plate 

 and the one next beyond it. Upper arm-plates broader than long, outer 

 side curved, and longer than inner side, which is nearly straight ; lateral 

 sides straight ; length to breadth (second plate), .4 : .8 ; as they go 

 towards the tip of the arm, they grow rapidly narrower, and propor- 

 tionately longer. Disk scales above, thick, swelled, close, of various 

 shapes and sizes, those towards the centre rather the largest, some 



* As the only specimen ir 

 has been taken from Liitken. 



the Smithsonian Institutii 



injured, a part of this description 



