A MONOGRAPH OF THE EXISTING CRINOIDS 323 



The ornamentation of the first 10 or 12 brachials is not so regular as in the specimen 

 from Blake station 272, and is in part composed of several pointed spines, which are 

 stouter than those on the specimen from Blake station 241. 



The distribution of the syzygies agrees with that in the first two specimens. In 

 the two preserved arms arising from a IIBr axillary the first syzygy is between brachials 

 1+2 and the second is between brachials 4 + 5 or 6+7. Also on arms arising from 

 IIIBr axillaries there appears usually to be a syzygy between brachials 1+2. 



The pinnules, which are poorly preserved, appear not to differ significantly from 

 those of the two other specimens. The carination of Pi is hatchetlike or convex as in 

 the specimen from Blake station 241. 



The reddish color is not present in this specimen which is gray, the base darker, 

 the arms lighter. 



The arms have an estimated length of 75 mm. 



Localities. — Blake stations 219, 241, 272. 



Geographical range. — Barbados, St. Lucia, and Carriacou (Grenadines). 



Bathy metrical range. — From 139 to 298 meters. 



Thermal range—From 11.67° to 18.20° C. 



CRINOMETRA BREVIPINNA var. ORNATA (Hartlaub) 



Antedon brevipinna var. ornala Hartlaub. Mem. Mus. Comp. Zool., vol. 27, No. 4, 1912, p. 323 (in 

 key), p. 348 (description; Blake station 249), pi. 4, fig. 6, pi. 12, fig. 4. 



Description. — A large and magnificent specimen with numerous stout and ricldy 

 ornamented arms, in spite of many deviations, was considered by Hartlaub as a further 

 development of the brevipinna type. 



The centrodorsal is rather flat with a typical dark-colored bare dorsal pole which 

 is beset with fine tuberosities. The interradial processes are well developed. The cirri 

 are about XXXIII; only one cirrus with 15 segments is entire. In this the first two 

 segments are short, the remainder elongated, and an opposing spine is present. 



The radials are wholly concealed. The IBr, are unusually flat. The similarly 

 flat IBr 2 (axillaries) are more rhombic than pentagonal, with a slight posterior process. 

 Of the 10 IIBr series present, five are 2, one is composed of a single axillary ossicle, and 

 four are 4(3 + 4). The ossicles are in general flat. The axillary is often of irregular 

 shape, with one side high and the other low. There are several IIIBr 2 series, one 

 IIIBr 1 series, and one IIIBr 2(1+2) series. Two IVBr 2 series are present. 



There are 32 arms. In the shape of the lower brachials there is a double variation. 

 First, there are about three transverse articulations, then about six diagonal, then two 

 or three transverse, the remainder being diagonal. The shape of the brachials changes 

 in accordance with the direction of the articulations. Toward the arm tips the brachials 

 have a scalelike overlap. 



The ornamentation differs from that of the two specimens described as var. 

 coronata in being more richly developed as a result of greater coarseness. On the IBr 

 series there is a slight granulation or tuberculation, only the distal edge of the IBr 2 

 (axillaries) showing a dentation. Usually the IBr axillary has a ridgelike or sharply 

 tubercular median ornamentation. This is also present on the IIBr series in the shape 

 of one or several erect and usually sharp tubercles, though granules or coarse spines are 

 here and there present on the dorsal surface, especially on the sides. The distal borders 



