Clark — Fotir New Echinoderms from the West Indies. 69 



are arranged in three rows parallel to the adambulacrals, with two or 

 three additional next to the median inferomarginals. The innermost 

 row (next to the adambulacrals) consists of about nine (corresponding 

 to fourteen adambulacrals), the next of four or five, and the third of 

 three, within which are two or three against the central inferomarginals. 

 The actinal intermediate plates are covered with rather large spaced 

 granules, consisting of a border series and from nine to fifteen central, 

 according to the size of the plate. 



The adambulacral plates are twice as broad as long, with a straight 

 furrow margin. They carry four or five untapered furrow spines which 

 are in length about equal to half the width of the plate, and are sub- 

 equal, very regular, arranged in a straight row. Beyond these is a naked 

 space, followed by a row of two or three rather stout, more or less coni- 

 cal, spines, usually more or less diagonal in position with the distal 

 nearest the furrow series. Beyond these again are from four to six well 

 spaced granular spines in two rows, resembling the granules on the acti- 

 nal intermediate plates, but slightly larger and more spaced ; on the 

 distal adambulacrals these become more numerous, smaller, and less 

 spaced. 



The mouth plates are triangular, very inconspicuous ; the furrow mar- 

 gin is longer than the edge adjacent to the first adambulacral. The 

 armature consists of three well spaced stout spines, followed by four 

 much more slender crowded spines, similar to those of the furrow series 

 on the adambulacrals; within these are three or four stout well spaced 

 spines continuing the second series on the adambulacrals; within these 

 again are five or six spaced granules, continuous with the granules on 

 the adjacent actinal intermediate plates. 



The color in alcohol is white. 



Type.— Cat. No. 36,930 U. S. N. M., from "Albatross" Station 2154, 

 off Havana, Cuba, in 310 fathoms. 



III. BRITTLE STAR. 

 Ophiocnida cubana new species. 



Disk 4.3 mm. in diameter, slightly convex as in 0. filogranea, covered 

 with prominent, slightly tumid, imbricating scales, among which the 

 circular primary plates, which are of nearly equal size and are separated 

 by spaces equal to their diameter or somewhat greater ( up to about a 

 diameter and a half), stand out rather prominently. 



In general the arrangement of the scales on the disk, and the form, 

 size, proportions, and amount and character of the partial separation of 

 the radial shields, agree with the same features in 0. filogranea. 



Scattered evenly over the surface of the disk there are approximately 

 seventy-five smooth cylindrical spines which in length are equal to about 

 two-thirds of the diameter of the circular primary plates. 



Along the periphery of the disk, beginning in a line between the outer 

 angles of the subtriangular radial shields, are very numerous and thickly 

 set spines, somewhat shorter than the spines on the dorsal surface, which 



