﻿OPHIOCNIDA SCABRIUSCULA. 



135 



arm. According to Dr. LeCoute, the color of the Uvhag animal would 

 seem to be the same. 



Vernations. — Dr. LeConte's original specimen has the outer side of 

 the upper arm-plates rather more curved, and almost without any 

 notch. 



O. hispida differs from 0. scabr'mscula in having narrower under 

 arm-plates, rather longer arms, and longer and sharper spines on the 

 disk : the markino;s, also, are black, instead of lio-ht a;reen. 



LIST OF SPECIMENS. 



WbeDce obtained. 



Museum of Comparative Zoology. 



251 I 1052 I 1 I Panama. I I Rev. T. Powell. I Aleoliolic, 



381 I . . I . . I Panama. 1 | Dr. Sternberg. I " 



Smithsonian Institution. 



1052 I . . I 2 I Panama. | I Rev. T. Powell. 1 Alcoholic, 



1197 . . 1 Panama. Dr. John LeConte. Dried. 



Ophiocnida scabriuscula Lvman. 



Ampldura scahriuscula Lutke.n^. Addit. ad Hist. Oph., p. 118. 1859. 



Special 3Iarks. — Arms six to eight times the diameter of the disk. 

 Small and very short spines on the disk. Arm-spines flattened. 



Descrip)tion of a Specimen. — Diameter of disk, S.S"""" ; from outer 

 side of mouth-shield to outer corner of opposite mouth-sht, 3.2'"°'- ; width 

 of arm without spines, l.S"""' ; length of arm, 52"""- ; distance from outer 

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

 outer corners of mouth-slits, 1.7 : 1.5. Mouth-papillae, six to each angle 

 of the mouth, small, rounded, separated, slightly flattened, nearly equal, 

 the innermost pair standing a little higher up than the others, and run- 

 ning upwards to the teeth. Teeth four ; upper one much the largest, 

 long, flat, moderately thick, with a slightly curved cutting edge ; two 

 next smaller, narrower, stouter, more rounded, with the edge thickened 

 at its middle point ; lowest one shaped like a broad, rounded, swelled 

 tubercle. Mouth-shields longer than broad, rounded within, prolonged 

 without, in a tail-like projection , inner end terminating in a rounded 



