284 RECENT OPHIURANS. 



covered above and below by a thick skin through which no plates, except the 

 radial sMelds, can be distinguished even though the animal is completely dried; 

 near the tip of the arm the under arm-plates are more or less visible. Radial 

 shields more than a millimeter long but much less than half that wide; the six 

 pairs cover nearly the entire disk; each shield bears 6-8 (or even more) granules 

 of somewhat variable size and very u-regularly placed; some of these granules 

 are relatively large. In each interradial area, more or less near the center of 

 disk (in two areas half way to margin) is a relatively very large, conical spine 

 (.3 mm. long by .12 mm.± thick at base), smooth and sharp; at the margin of 

 the disk (or just below) are several, typically 4, more such spines. The mouth- 

 parts, side arm-plates and spines show no distinctive features; there are 5 arm- 

 spines, the middle one largest. The position of each upper arm-plate is indicated 

 by a rough knob which is apparently at the central, distal margin; between each 

 pair of knobs, there is a conspicuous granule on each side of the basal arm- 

 joints: these become smaller and ultimately disappear distally. Color (dried 

 from alcohol) : — disk variegated pale cream-color and dull blue (hence the name) ; 

 arms u-regularly but extensively banded with blue on upper surface; oral surface 

 of disk and arms uniformly light. 



HoLOTYPE (M. C. Z. 2497). Arabian Gulf. April, 1861. Capt. C. 

 Mullet coll. 



This specimen was labeled by Mr. Lyman: "Ophiothela? sp. nov.?" but 

 was never described. It is the largest Ophiothela in the collection and seems 

 to be nearest to isidicola. It is distinguished from that and all other species 

 by the thick skin, the smooth, sharp conical disk-spines and the color. 



944. O. DANAE Verbill, 1869. Proc. Boston soc. nat. hist., 12, p. 391. Doderlein, 1896. Jena. 



denkschr., 8, pi. 17, f. 25-256. 



11 specimens, including 10 cotypes. Fiji Islands. Dutch East Indies: 

 Flores, Badjo Bay, 23 fms. 



945. 0. DIVIDUA von Martens, 1879. Sitzb. Berlin ges. nat. Fr., p. 127. 



3 COTYPES. South Africa: Algoa Bay. 



946. O. HADRA, sp. nov. (d6p6s, stout). Plate 14, f. 2. 



Disk, 1.7 mm. in diameter; six arms, each 3-4 mm. long. Very similar to 

 0. verrilli but the oral shields and adoral plates are very small and virtually 

 indistinguishable; there are no spines on the adoral plates. The "knobbed 

 spines" of the disk are nothing more than minute granules, except one much 



