318 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



CRINOMETRA BREVIPINNA Tar. GEMMATA A. H. Clark 



Plate 30, Figure 92 

 [See also vol. 1, pt. 2, fig. 679, p. 338.] 



Crinometra gemmala A. H. Clark, Proc. U. S. Nat. Mus., vol. 36, 1909, p. 647 (description; Albatross 

 station 2330); U. S. Nat. Mus. Bull. 82, vol. 1, pt. 2, 1921, fig. 679, p. 338. 



Antedon granitlifera (part) Hartlaub, Mem. Mus. Comp. Zool., vol. 27, No. 4, 1912, p. 298 (second 

 specimen from Martinique), pi. 5, figs. 7, 9, pi. 12, fig. 8. 



Crinometra ornata H. L. Clark, Bull. Lab. Nat. Hist. Univ. Iowa, vol. 7, No. 5, 1918, p. 11 (Bahama 

 Expedition stations 9, 16; notes). 



Description. — The centre-dorsal is hemispherical with the bare polar area small and 

 papillose. The cirri are arranged in two irregular crowded rows, showing a tendency 

 toward a columnar arrangement, two columns to each radial area. 



The cirri are XX, 12-15, from 20 to 25 mm. long. The first segment is very short, 

 the second is twice as broad as long, the third is nearly as long as broad, the fourth is 

 half again as long as broad, the fifth-seventh are about twice as long as broad, and 

 those following slowly decrease in length to about half again as long as broad on the 

 antepenultimate. The penultimate segment is twice as long as broad, slightly less in 

 lateral width than those preceding. The distal edge of all the segments is slightly 

 produced, overlapping the bases of the segments succeeding, and the terminal six to 

 eight have slight terminal spines on the dorsal side, most developed on the antepenul- 

 timate. The opposing spine is small, terminal, and directed obliquely forward. 



The ends of the basal rays are visible as elongate tubercles in the angles of the calyx; 

 they are usually covered with short fine spines. 



The radials are concealed, or just visible over the ends of the basal rays. The 

 IBri are very short and bandlike, of uniform height, strongly curved, with the proximal 

 edge everted and dentate; they bear a row of small pointed tubercles which are some- 

 times more or less confluent midway between the anterior and posterior borders. The 

 IBr 2 (axillaries) are rhombic, two-and-one-half times as broad as long, with the anterior 

 and posterior angles approximately equal and the lateral edges about equal to those of 

 the IBr,. The IIBr series are 4(3+4), in one specimen twice 2. The IIIBr series are 

 2(1+2), but only a single one is present, developed interiorly. The division series are 

 in close lateral apposition and are sharply flattened laterally. They are strongly and 

 evenly convex dorsally, so that the dorsal portion of P D is exposed. The division series 

 and arms as far us the fourteenth brachial are thickly beset with numerous small sharp 

 conical tubercles which exhibit a tendency to arrange themselves in horizontal rows; 

 these become more numerous and more slender along the edges of the ossicles of the 

 division series. Seen without a glass, the proximal portion of the animal has the 

 appearance of being finely and evenly granulated. 



The 19-21 arms are from 110 to 125 mm. long, except for the basal ornamentation 

 resembling those of other forms of the species. 



The pinnules in general resemble those of the other forms. On the ornamented 

 proximal portion of the arms they are strongly carinate, the carination being more or 

 less coarsely tubercular or irregular. The third and fourth segments of the genital 

 pinnules are considerably expanded. The distal pinnules are 8 mm. long. 



The disk is completely covered with a pavement of very small plates. Side and 

 covering plates are well developed along the pinnule ambulacra. 



