312 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



The cirri are XV, with three short and strikingly thick basal segments. No cirri 

 are completely preserved. 



The radials are concealed. The IBi'i and the hexagonal IBr 2 (axiUaries) are rather 

 flat ; the axillaries lack a posterior process. The IIBr series are 2. 



The ornamentation as far as the third brachial is very characteristic. The IBri 

 bear rather large tubercles which are mostly marginal, and in addition a conspicuous 

 median tubercle. The IBr 3 (axiUaries) have a thickened and somewhat produced 

 dentate proximal border, but the distal border is lower and usually smooth; on the 

 otherwise smooth surface there is a strongly produced median ridge. On the IIBr 

 series and first three brachials this median ridge or median swelling is the most con- 

 spicuous and, apart from slight irregularities of the surface, the only ornamentation. 

 The angular sharpening of the ossicles produced in this way, which is evident in part 

 also on the brachials, furnishes an easy recognition mark for this variety, as does the 

 lack of all ornamentation from the third brachial outward, where there is nowhere any 

 trace of the thickening of the distal edges that is in other varieties almost always 

 present. 



Thero arc 15 arms. The articulations of the first three brachials are transverse, 

 those following diagonal, the brachials changing their form accordingly. The arms 

 appear stiff. Unfortunately the arms are poorly preserved so that it cannot be deter- 

 mined whether they decrease in width rather rapidly or gradually from the broad base. 

 Tho middle portion of the arms is already strongly compressed laterally. This decrease 

 in width of the arms is exceedingly characteristic of this variety. 



In arms arising from a IBr axillary the first syzygy is as a rule between brachials 

 3+4, in arms arising from a IIBr axillary between brachials 1 + 2. In the single better 

 preserved arm arising from a IBr axillary the following syzygies are between brachials 

 19 + 20, 26 + 27, and 30 + 31. 



None of the lower pinnules are preserved entire. They appear to be short with 

 strong carinate basal segments. A pinnule from the middle of the arm is 3 mm. long 

 with 8 segments which, with the exception of the first two, are elongate. 



The arms have an estimated length of 40-50 mm. 



The ambulacral plating consists of stout side and covering plates. Sacculi are not 

 apparent. The disk is high, deeply incised, 5 mm. in diameter. 



In alcohol the skeleton is whitish gray, the disk darker gray. 



Locality. — Blake station 269. 



Geographical range. — Known only from off St. Vincent. 



Bathymetrical range. — Known only from 227 meters. 



Thermal range. — One record, 14.17° C. 



CRJNOMETRA BREVIPINNA Tar. BREVIPINNA ( I'ourtalfti) 



Comatula brevipinna Pourtales, Bull. Mus. Comp. Zool., vol. 1, No. 6, 1868, p. Ill (description; 

 off Havana, 270 fathoms; Corwin [station 2]). 



Antedon brevipinna P. H. Carpenter, Challenger Reports, Zoology, vol. 26, part 60, 1888, pp. 54, 

 207, 208, 211, 212 (in key), 378 (Straits of Florida; 270 fathoms [Corioin station 2]).— Hartlatjb, 

 Mem. Mus. Comp. Zool., vol. 27, No. 4, 1912, p. 313 (reprint of original description and rede- 

 scription of the type specimen from Corwin station 2 ; descriptions of specimens from Blake stations 

 232, 269), pi. 1, figs. 17, 18, 21, pi. 3, figs. 1, 3, pi. 4, fig. 2. 



Crinometra brevipinna A. H. Clark, Journ. Linn. Soc. (Zool.), vol. 36, No. 249, April 1929, p. 658 

 (off St. Thomas; 240 fathoms). 



