300 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



with tubercles, often gathered into groups of several, there are no tubercles on the 

 smooth dorsal surface of the IBr and IIBr series. From the IBri to the fifth brachial 

 the ossicles have sharply flattened sides. Noteworthy is the everted proximal border 

 of the rhombic IBr axillary. Of the IIBr series, nine are 2 and one is 4(3+4); the 

 IIBr scries are 2. 



There are 22 arms. The ornamentation of the arms from the fourth to the eighth 

 or tenth brachial, and the form of the brachials, resemble the same features in var. 

 pulchella. At about the twelfth brachial the swellings or tubercles stop and liplike 

 ornamentation begins, coincident with the transition of the brachials to a triangular 

 form with diagonal articulations. After the end of the liplike ornamentation, which 

 runs to about the twentieth brachial, the next 10-15, or thereabouts, brachials carry a 

 blunt tubercle on the distal border which was noticed by Hartlaub in other varieties, 

 but in them it is not so prominent, nor does it appear on so many brachials. At about 

 the fiftieth brachial the triangular form passes over into a bluntly wedge-shaped form. 



The sequence of the syzygies is rather variable and resembles that in var. insculpta. 

 On arms arising from a IIBr axillary the first syzygy is always between brachials 3+4; 

 the second is from between brachials 6 + 7 to between brachials 16+17, and the distal 

 intersyzygial interval is from 5 to 10 muscular articulations. In the four arms arising 

 from IIIBr axillaries the first syzygy is between brachials 1+2; this is followed by 

 another between brachials 3+4 or 4 + 5; the next is from between brachials 12 + 13 to 

 between brachials 16 + 17; and the distal intersyzygial interval is from 6 to 8 muscular 

 articulations. In the two arms following the IIBr 4(3 + 4) axillary the first syzygy is 

 between brachials 1 + 2; on one arm there is another between brachials 5+6; the next 

 syzygy is between brachials 11 + 12 on one arm and between brachials 12 + 13 on the 

 other; the following syzygy is between brachials 22+23, and the distal intersyzygial 

 interval is from 4 to 9, usually 6 or 7, muscular articulations. 



Pi is 10-12 mm. long with about 40 segments — the largest number found in any 

 of the varieties of Crinometra brevipinna. The 6-8 basal segments arc broadened and, 

 with the exception of the first, doubly carinate, a narrow keel being especially promi- 

 nent on one side of the second-fourth segments. These broadened segments are fol- 

 lowed by small elongated segments which toward the pinnule tips become short again 

 and often also broader. The pinnules following to about P 4 are 9-1 1 mm. long and have 

 a smaller number of segments. On some arms they are as long as P 1( on others 1-2 

 mm. shorter; the second to fourth segments have a narrow keel on one side. From this 

 point onward the pinnules gradually become shorter. The pinnules of the middle 

 of the arm, from about the twenty-fifth brachial onward, are 7 mm. long with usually 

 13 segments of which the two or three basal are short. Beyond the fiftieth brachial 

 the length and number of segments again increases. The distal pinnules are 9 mm. 

 long with about 16-18 segments. Most of the pinnules from P 3 onward bear short 

 gonads the two or three segments covering which are broadened. 



Especially striking are the dark colored sacculi; the side- and covering-plates are 

 easily visible to the naked eye. 



The disk is 11 mm. in diameter and slightly incised, as in var. insculpta. 



Localities. — Blake station 193; Albatross station 2342; University of Iowa's Bahama 

 Expedition station 2. 



Geographical range. — From northern Cuba to Martinique. 



