﻿OPIIIOGLYPIIA SARSII. 41 



Ophioglypha Sarsii Lyman. (Figs. 2, 3.) 



Ophiura acufera Agass. Proceed. Am. Aciul., l.S.'jl, p. 2G9. [No tlescription.] 



Ophiolepix citiala Stisips. Inverteb. of Grand Maiian. Smitlison. Contrib., VI. p. 13. 1854. 



Ophiuiri n„i,i,;„ M' TiiEN. Vidcnsk. Mfddclclser. Nov., 18.'54. 



Opliiiim .firilr,,/ 1,1 iKicx. ViiU'iisk. IVkMlcUdidsur. Nov., 1854. 



Ophiura SarsH LriiiKN. Videiislc McddeU'Iser. Nov., 1854. 



Ophiura Sarsii LiJTKiiN. Addit. ad Hist. Oj)!!., p. 42. 



Special Maries. — Arms, in the adult, three or four times as long as 

 diameter of disk ; longest arm-spine aliout as long as an arm-joint ; 

 primary plates much larger than the intermediate disk-scales. 



Description of a Specimen. — Diameter of divsk, IV.S""- ; from outer 

 edge of mouth-shield to outer corner of opposite mouth-slit, 8""°- ; width 

 of arm, -without sjDines, S.S"""-; length of arm, 60°"°-; distance from outer 

 edge of mouth-shield to inner points of mouth-papillEe, to that between 

 outer corners of mouth-slits, 4.6 : 3.4. Mouth-papilla3 usually thirteen to 

 each angle of mouth, namely, six on each side, and one at apex of angle ; 

 sometimes seven on each side, or again only five ; the papilla at the 

 apex points directly to centre of mouth, and is about twice as large as 

 any of the others ; it has a diamond or- spear-head shape ; rest of papilla3 

 small, flat, short, and rather sharp ; outer ones smallest ; outermost one 

 usually broader and lower than others, being shaped like a cutting edge. 

 Teeth shaped like innermost mouth-papilla, usually four, but sometimes 

 five in number. Mouth-shields longer than broad, bounded by a curve 

 without, an angle withm, and laterally by straight lines ; length to 

 breadth, 2.4 : 2 ; length of sides bounding inner angle, 1.4°"" ; madre- 

 poric shield rather smaller and more rounded, with a slight rising in the 

 middle. Side mouth-shields curved, and very long and narrow ; starting 

 from inner end of mouth-sKts, they follow the sides of the mouth-shield, 

 and meet at its inner pomt ; length to breadth, 2.4 : .6. Under arm- 

 plates covered in good part, even at base of arm, by side arm-i^lates ; 

 all of them, therefore, are much broader than long, and are bounded 

 only by three sides, viz., one outer side nearly straight, and two inner 

 laterals, which are a little re-enteringly curved, and which slope from 

 outer comers of plate towards its middle line, on which they meet in a 

 point ; the shape is that of a very short triangle, the point being directed 

 inward. First plate unusually large, nearly oval, length to breadth, 1:2; 

 second plate of usual shape, but a little longer than those immediately 

 following, length to breadth, 1:2; length of inner lateral, 1.4""°- ; twen- 

 tieth plate, .6 : 1.2 ; plates about two thirds out on arm, .4 : .8 ; close to 

 tip of arm, plates so covered as to be scarcely perceptible ; they are not 

 more than one half or one third the width of the arm, and are bounded 

 by six sides, two outer laterals and two inner laterals, slojaing towards 



