308 BULLETIN 82, UNITKD STATES NATIONAL MUSEUM 



The arms are 21-29 in number and resemble in structure those of related forms. 

 The first 18 or 20 brachials are laterally flattened. 



The pinnules resemble those of related forms but are somewhat more slender, 

 the genital pinnules not being so much expanded. 



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

 covering plates are well developed along the ambulacral grooves. 



The color hi alcohol is white or dull yellowish. 



Localities. Albatross stations 2154, 2155, 2156, 2319-2350. 



Geographical range. Reported only from off northern Cuba. 



Bathymetrical range. From 508 to 567 meters. 



CRINOMETRA BREVIPINNA var. DIADEMA (Hartlaub) 



Antedon brevipinna var. diadema HARTLAUB, Mem. Mus. Comp. Zool., vol. 27, No. 4, 1912, p. 323 

 (in key), p. 337 (description; Blake station 101). 



Description. A brilliant white specimen, the lightest colored of all the specimens 

 he studied, from Blake station 101 was regarded by Hartlaub as representing a special 

 variety. 



The centrodorsal is flat with a flattened dorsal pole which is rather large and is 

 beset with coarse and relatively high toothlike or spiny processes. The corresponding 

 processes in var. insculpta are fine and not so high. There are also small tubercles and 

 teeth between the cirri and on the interradial processes. Interradial ridges are present, 

 but are not sharply elevated. The cirri are arranged in vertical pairs. 



The cirri are XIX, about 12; the distal segments have no processes on their thick- 

 ened distal edges, but an opposing spine is present. 



The radials, partially concealed, are in part deeply withdrawn within the calyx 

 and are almost wholly covered by the IBri, which are flat and bowed. The IBr 2 

 (axillaries) are rhombic to hexagonal, without a prominent proximal process. The 

 IIBr series are 2. The first four brachials are rectangular; these are followed by a few 

 bluntly wedge-shaped ones, then two or three approximately rectangular, changing 

 rather suddenly to nearly triangular, these persisting to the arm tips. The change in 

 form of the brachials is not so abrupt as hi other varieties. 



Ornamentation is relatively slightly developed. That of the centrodorsal has been 

 described. On the borders of the IBrj there are a few coarse tubercles which make these 

 ossicles appear dentate or crenulate. The proximal border of the IBri, like that of the 

 IBr 3 (axillary) is produced in overlapping scalelike fashion. The axillary has merely 

 marginal decorations of the same sort and a median ridge, but is otherwise smooth. 

 On arms arising from a IBr axillary the two first brachials are variable. They are 

 partly beset with several coarse tubercles, but in most cases then" surface is flat or only 

 slightly uneven. The proximal border of the first brachial is as a rule dentate. In the 

 middle there is a ridge, or a small round and flattened median tubercle which becomes 

 more pronounced on the third brachial, on the later brachials, in the middle of the raised 

 distal edge, appearing markedly higher and knoblike, in this form and position giving 

 an extremely characteristic fascies to the ornamentation of this variety. Equally 

 characteristic is the fact that from the fifth brachial onward the distal edge is elevated 

 and begins to turn back over the dorsal surface of the brachials in a conspicuous manner. 

 Besides the large knoblike median tubercle there are several smaller ones on the distal 



