234 BULLETIN OF THE 



flattened, delicate, glassy arm-spines with sharp thorns, along their edges 

 only (Fig. 32); the second, third, and fourth are longest, and about equal. 

 Disk closely beset with minute stumps (Fig. 29), which are larger and tinted 

 near the edges of the disk and below (Fig. 30). The radial shields have a 

 less number, and are small. The under arm-plates (Fig. 31) are bounded 

 by a curve without, and have sides which converge. The upper arm-plates 

 are broader than long, overlapping, diamond-shape, and slightly keeled. 

 Color pink. (J. ciliuris and 0. fun/aria are likewise originals of Lamarck. 

 With them I found Ophiomaza cacaotlca, which marks their locality as the 

 region of the Indian Ocean. No. 12S, Museum Godeffroy, seems to be 0. 

 fumaria. 



Ophiothrix aspidota Mull. & Tn. Original at Berlin, Xo. 1,108, 

 Fast Indies, by Schoenlein. Diameter of disk 10 mm. Radial shields na- 

 ked ; rest of disk closely beset with minute scarcely thorny conical stumps, 

 which are smaller below. Upper arm-plates have a microscopically granular 

 surface. Arm-spines glassy with very feeble thorns. Dr. von Martens 

 agrees that No. 1,9G6, from Makassar, is this species. I also have it from 

 the Celibes ; and there are young ones — often with a few stumps on the 

 radial shields — in the Museum Godeffroy. 



Ophiothrix propinqua Ly.m. The Ophiurans described by Dr. Liitken 

 (Addit. ad Hist. Oph., III. 50) as the young of 0. lonr/ipeda are not that, but 

 the adult <>. propinqua, and have naked radial shields. The tendency of 

 young Ophiothrices is to have thorny radial shields, even when these are 

 naked in the full grown. 



(Ophiothrix) clypeata L.tx., is the young of an Opltiocnemis, almost 

 certainly of 0. marmorata. In the Garden of Plants are specimens brought 

 in 1842 by Ilombron and Jaquinot from Trincomalee, Ceylon. 



Ophiothrix Martensi sp. nov. 



Plate IV., Figs. 9, 10. 



Special Marl:*. — Seven stout arm-spines; the upper ones with thorny, 

 club-shaped ends ; the lowest having the shape of a triple or quadruple 

 hook. Disk naked above, with short, conical, scattered spines on the edge 

 and in intcrbrachial spaces below. Color, above, bright indigo, with a 

 darker blue line along the arm, ami, along the under side of arm, a white 

 line. 



Description of an Individual. — Diameter of disk 14 mm. Length of arm 

 63 mm. Width of arm, without spines, 2 mm. Four thick teeth ; below 

 them, two pairs >>f stout tooth-papilla? ; and, below these, the usual oval of 

 small, crowded, tooth-papillae about thirty-two in number, of which about 



