A MONOGRAPH OF THE EXISTING CRINOIDS 291 



d 1 . Division series with fine marginal ornamentation in the form of small spines, tubercles, or 

 dentation; median ornamentation little developed; a row of spines or teeth on the distal 



edge of the first ten or twelve brachials coronata (p. 320) 



d*. Division series with coarse marginal ornamentation in the form of a coarse dentation; 

 median ornamentation strongly developed; distal border of the first 10 to 17 brachials 

 bristling with large spines and teeth, and the surface of the fourth-tenth brachials beset 



with small spines or teeth ornata (p. 323) 



a 3 . Division series and arm bases wholly without ornamentation, strongly convex or subcarinate 

 dorsally, the IBr axillary and the second segment beyond with more or less developed rounded 

 posterior processes. 



6'. Brachials from the third or fourth to about the thirty-fifth with conspicuously swollen and 

 produced distal ends, the middle of which is swollen into a broad tubercle which may extend 



anteriorly to the proximal edge; IIBr series 2 pulchra (p. 334) 



V. Lower brachials without produced distal ends; IIBr series 4(3 + 4) .angusta (p. 335) 



CRINOMETRA BHEVIPINNA nt. INSCULPTA A. H. Clark 



PLATE 32, FIGURE 99 

 [See also vol. 1, pt. 2, figs. 680, 681, p. 338.1 



Crinometra insculpta A. H. CLARK, Proc. U. S. Nat. Mus., vol. 36, 1909, p. 646 (description; Albatross 

 station 2753). H. L. CLARK, Mem. Soc. Cubana Hist. Nat., vol. 15, No. 1, 1941, p. 10 (Atlantis 

 stations 2950, 2980, 2980A, 2980B, 2982A, 2982B, 2982C, 2983, 2983A, 2984, 2987, 2999, 3000, 

 3303, 3326, 3372, 3388, 3425, 3430, 3431, 3432, 3434, 3435, 3436, 3438, 3466, 3467, 3478, 3482). 



Antedon brevipinna var. decora HARTLAUB, Mem. Mus. Comp. Zool., vol. 27, No. 4, 1912, p. 322 (in 

 key), p. 324 (description; Blake stations 34, 157, 158; also St. Vincent), pi. 11, figs. 4, 9. 



Description. The centrodorsal is flattened-hemispherical with the bare polar area 

 3 mm. in diameter, thickly covered with prominent small rounded tubercles. The 

 cirrus sockets are arranged in two, or two and a partial third, very closely crowded 

 and irregular rows. 



The cirri are XX, 15-18, from 25 to 30 mm. long. The first segment is very 

 short, the second and third are about twice as broad as long, the fourth is about as long 

 as broad, the next four or five may be slightly longer than broad, and the remainder 

 are about as long as broad; or the fourth and following may all be about as long as 

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

 those preceding. The opposing spine is minute, terminally situated, directly obliquely 

 forward. The terminal claw is about three-quarters the length of the penultimate 

 segment, moderately slender and moderately and evenly curved. The segments have 

 slightly thickened distal ends and the terminal six or seven have the distal part of the 

 dorsal surface raised into a transversely broad tubercle with a more or less crenulate 

 or serrate distal edge. 



The ends of the basal rays are visible in the interradial angles as a cluster of high 

 tubercles, with difficulty separable from the similarly modified surface of the surround- 

 ing elements. 



The radials are concealed. The IBri are very short, usually concealed except in 

 the angles of the calyx. The IBr 2 (axillaries) are. triangular, three or four times as 

 broad as long. The IIBr series are 4(3+4) and 2, usually both in the same specimen, 

 the former in the majority; when the IIBr series are 2 the ossicles are in close apposition 

 along their entire lateral edges, no water pores being present. The IIIBr series are 

 2(1 + 2) following a IIBr 4(3+4) series, and 2 following a IIBr 2 series; they are devel- 

 oped internally. In the rare cases on which IIIBr series are developed externally they 



