A MONOGRAPH OF THE EXISTING CRINOIDS 301 



Bathymctrical range. — From 201 to 367 meters. 

 Thermal range. — One record, 10.56° C. 



CEINOMETRA BREVIPINNA Tar. TRANSVERSA Gial«n 



Crinometra transversa Gisl£n, Vid. Medd. Dansk Nat. Foren. K0benhavn, vol. 93, 1933, p. 478, fig. 

 5 (?), p. 482, pi. 23, figs. 1-4; Kungl. Fvsiogr. Sallsk. HandL, new ser., vol. 45, No. 11, 1934, 

 p. 29. 



Description. — The centrodorsal is a thick disk, considerably excavated at the 

 dorsal pole, which is 3 mm. in diameter, granulated and pitted; the interradial portions 

 are covered with stout pointed tubercles. The cirri are arranged in 15-20 crowded 

 columns. 



The cirri are XXXVI, 17-18, about 23 mm. long. The first three segments are 

 short, the fourth is as long as broad, the fifth is half again as long as broad, the sixth is 

 one-third again as long as broad, and the eighth is as long as broad. From the eighth 

 segment onward there is a dorsal projection which from the ninth to the twelfth is 

 transformed into a transverse, indistinctly bilobate, crest. The opposing spine is 

 similarly transverse, with sometimes a slight notch in the crest. The terminal claw 

 is slightly shorter than the segment preceding, which is one-third again as long as broad. 



The radials are scarcely visible except in the interradial angles where there are 

 some projecting tubercles. The IBri are very short, covered with long tubercles which 

 proximally and distally fuse into serrate flanges along the borders of the ossicle. The 

 IBr 3 (axillaries) have a high mediodorsal tubercle and the flanged proximal and distal 

 borders are provided with three or four stout eminences on each side of the median 

 line both proximally and distally. In this way the margins of the ossicle are bordered 

 by a more or less distinct and everted denticulation; moreover, there is a median dorsal 

 tubercle or crest; otherwise, however, the ossicle is smooth. A crest, well set off, also 

 appears on the first two elements of the IIBr series, which have generally everted mar- 

 gins and sometimes also marginal tubercles. Of the 10 IIBr series, 9 are 2 and one is 

 4(3+4). The IIIBr series, which are internally developed, are 2. 



The 24 arms are 150 mm. long. The first two brachials have a mediodorsal knob 

 and on some arms also slightly everted margins. On the third and fourth brachials 

 there may appear some extra submedian knobs. The median tubercle is later trans- 

 formed into a dorsal spine or carinalion which is developed in the distal portion of the 

 ossicle. This tubercle is traceable only a short way along the arm. The distal margin 

 of the brachials soon becomes a little overlapping and more or less denticulate. Though 

 in rather close lateral contact basally, the arm bases are only slightly, or not at all, 

 "wall-sided." 



Syzygies occur between brachials 1+2, again from between brachials 16+17 to 

 between brachials 20 + 21, and distally at intervals of from 2 to 17 (usually about 10) 

 muscular articulations. 



Pi is about 13 mm. long with 27-28 segments. P 2 is 14 mm. long with 24 segments. 

 P» is 12 mm. long with 19 segments. P 6 is about 9 mm. long. P 8 is 9 mm. long with 

 15 segments. Pi 3 is 9 mm. long with 15 segments. The distal pinnules are a little 

 longer again; the proximal segments are short, the distal one-third again as long as 

 broad, as in the proximal pinnules. From about P 5 onward the third-fifth segments 

 are somewhat expanded. 



