322 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



Indian Ocean, 1012, p. 36 (identity), p. 40 (includes anceps of Chadwick, 1904), p. 130 (Bay of 

 BangB] [from Ilartlaub] and Ceylon [from Chadwick]; Philippines [ = H. parilis]; specimens 

 n-eorded are //. reynaudi; records from Queensland and Holothuria Bank refer to Zygometra 

 punctata), p. 318 (specimens recorded are all //. reynaudi), fig. 12, p. 131, is II. rtynaudi; Die 

 Fauna Sudwcst-Australiens, vol. 4, Lief. 6, 1913, p. 310 (all Australian records refer to Zygometra 

 punctata), pp. 313, 314 (same).— H. L. Clark, Spolia Zeylanica, vol. 10, pt. 37, 1915, p. 93 

 (occurs at Ceylon). — A. H. Clark, Unstalked crinoids of the Siboga-Expod., 1918, p. 79 (char- 

 acters given in the key, and "eastern coast of India" refer to H. reynaudi) ; Smithsonian Misc. 

 Coll., vol. 72, No. 7, 1921, pi. 2, fig. 21 (ambulacral deposits). — Gisl£n, Kungl. Fysiogr. Sallsk. 

 Handl., new ser., vol. 45, No. 11, 1934, pp. 22, 23. 

 Ilcteromelra aspera A. H. Clark, Vid. Medd. Naturh. Foren. K0benhavn, 1909, p. 162 (description; 

 Singapore), p. 193 (collected at Singapore by Svend Gad); Crinoids of the Indian Ocean, 1912, 

 p. 128 (synonymy; Singapore); Unstalked crinoids of the Siboga-Exped., 1918, p. 79 (in key; 

 range); A. H. Clark, Journ. Linn. Soc. (Zool.), vol. 36, No. 249, 1929, p. 638 (Singapore; 7 

 fathoms); Proc. Biol. Soc. Washington, vol. 47, 1934, p. 11 (Singapore). — Gisl£n, Kungl. 

 Fysiogr. Sallsk. Hand!., new ser., vol. 45, No. 11, 1934, p. 22. 



Diagnostic jeatures. — The brachials beyond the proximal fourth of the arms are 

 exceedingly short, discoidal, with the ends parallel, and the distal ends of the lower 

 brachials are produced and more or less strongly everted. There are no IIIBr series. 

 The cirri are 13-22 mm. long, with 22-31 (rarely so many as 30) segments of which 

 the longest are somewhat longer than broad. The 11-18 arms are 50-100 mm. long. 

 P a and P 8 are similar, 9 mm. long with 24 segments, or P 3 is somewhat smaller than P 2 . 



Description. — The centrodorsal is a rather large convex disk with inwardly 

 sloping sides; the convex bare dorsal pole is sculptured with small pits. The cirri are 

 arranged in one and a partial second marginal rows. 



The cirri are XVII, 22-24, about 13 mm. long. The fifth-eighth segments are 

 somewhat longer than broad, and the outer are slightly compressed laterally, from 

 the ninth onward bearing a well developed spine. 



The radials are partially visible. The IBr^ are short and broad, laterally either 

 free or partially united. The IBr 2 (axillaries) are short, broad, and 5-sided. One 

 IIBr 4(3+4) series is present. The division series have flattened sides from the IBr! 

 to the second brachial. They are bordered by low shelves which are somewhat pro- 

 duced and arc sharply set off from the rounded dorsal part of the segments. 



The 1 1 arms are apparently 50 mm. long. They have a bluntly serrate dorsal 

 profile. The brachials are very short. The first eight brachials, the first syzygial 

 pair not excepted, are as short as those following. They have, especially the second, 

 alternating slight lateral overlappings at the distal end. The following brachials 

 are wedge-shaped with somewhat produced distal borders, those succeeding later 

 becoming more discoidal and remaining short to the tips of the arms. 



Syzygies occur between brachials 3+4, again between brachials 9 + 10 or 10+11, 

 and distally at intervals of 3 to 6 (usually 4) muscular articulations. Toward the ends 

 of the arms the intersyzygial interval becomes somewhat larger. In arms arising 

 from a IIBr axillary the second syzygy is about brachials 16 + 17, and the intersyzygial 

 interval is 8 to 10 muscular articulations. 



The lower pinnules are rather stiff. P D , and on the arms arising from a IBr 

 axillary P,, is short and is composed of about 20 segments. P 2 and P b are of about 

 equal length, 7 mm, long. The following pinnules decrease gradually in length to 

 those of the sixth pair, which are the shortest. From this point they increase rapidly 



