332 BULLETIN OF THE 



outer side itself rests against the first side arm-plate. Under arm-plates 

 longer than broad ; touching each other ; bounded within by a truncated 

 angle, without by a curve, and on the sides by re-entering curves. Side arm- 

 plates not meeting either above or below. Upper arm-plates much broader 

 without than within ; as long as, or longer than, broad ; bounded without 

 by a curve, on the sides by straight converging lines. Disk finely scaled 

 below; above covered with irregular, rather coarse and swollen scales, 

 some of which bear little, stout spines. Radial shields broad wedge-shape, 

 small, their length not more than one fifth the diameter of the disk ; touch- 

 ing each other only at their outer end ; strongly diverging and separated 

 by a wedge of two scales, placed end to end. Near base of arm, four short, 

 stout, rough, nearly equal arm-spines ; further out, three ; one stout tentacle 

 scale. Color, in alcohol, brown. In the covering of the disk, and espe- 

 cially the size and position of the radial shields, this species resembles the 

 figures of O. Ballii and 0. abyssicola ; * but the upper and lower arm-plates 

 are quite different, and 0. Ballii has five arm-spines ; and the upper arm- 

 spine of 0. abyssicola is much the longest. 0. virens has the side mouth- 

 shields joined in a continuous ring.f There is a single specimen of a dif- 

 ferent species, dredged in 45 fathoms, which comes perhaps nearer to one 

 of the above European species ; but I propose to disregard it until I can 

 have originals for careful comparison.^ 

 In 110 fathoms. 



Amphiura semiermis Lyman, sp. nov. 



Special Murks. — No scales on disk underneath. Six mouth-papillae to 

 each mouth-angle, of which two are above the others, in the mouth-slits. 

 Side mouth-shields broail triangular and meeting within. 



Description of a Specimen. — Diameter of disk 4 mm. The arms were 

 broken, but their length seemed to have been about 30 mm. Mouth- 

 papillaj six to each angle of mouth ; a pair at the point of the angle, 

 which are stout and rounded and run upwards to the teeth ; one spini- 

 form on ; the inner edge of the side mouth-shield ; and one intermediate 

 on each side, also spiniform, and situated high up in the mouth-slit. 

 Teeth three, flat, strong, squarish, with a slightly curved cutting edge. 

 Mouth-shields rounded oval, with a slight point within ; length to breadth 

 .5 : .4. Side mouth-shields broad triangular, large, meeting within ; they 

 extend nearly to the median line of the arm and overlap the first, rudi- 



• S:irs, Ovcrsigt af Norses Echinodermer, Tab. II. 



t Ljungman, Ophiuroidea Viventia, p. 323. 



| In Catalogue No. 1, of Museum of Comp. Zoology, I have placed 0. abyssicola 

 under Ophiocnida, because I mistook the drawing given by Sars. I have not the same 

 excuse for my blunder in putting 0. Ballii there, for I had seen a specimen at Berlin. 



