322 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



syzygics occur between brachials 3+4, 14+15, 22+23, 25+26, and 32+33. In the 

 arm arising from a HBr axillary syzygics occur between brachials 1+2, 3 + 4, 18 + 19, 

 28+29, and 36+37. In the specimen from Blake station 241 there are three arms 

 arising from IIBr axillaries in which the first syzygy is between brachials 1+2 and the 

 second is between brachials 3 + 4. On an arm arising from a IBr axillary which bears 

 regenerated brachials from the epizygal of the second syzygial pair onward the syzygics 

 are between brachials 3+4, 4+5, 26+27, 35+36, 45+46, and 58+59. 



In the specimen from Blake station 241 P, on arms arising from a IIBr axillary 

 is about 10 mm. long with about 20 segments of which the first six are broadened and 

 the third-sixth bear a typical hatchet-formed, or convex, keel. In the specimen from 

 Blake station 272 this hatchetlike carination is not evident. Here the corresponding 

 keels are straight and narrower. The pinnule inself is 7-8 mm. long with about 20 

 segments. The pinnules following become gradually shorter and the number of their 

 segments fewer. The pinnules of the middle of the arm may be observed only on 

 unregenerated arms in the specimen from Blake station 272. They are 4 mm. long 

 with 8-10 segments of which the two basal are short, the remainder elongated. Where 

 gonads are developed the third and fourth segments are broadened. In this variety 

 these pinnules resemble those of the first Martinique specimen of granulifera. Toward 

 the arm tips the pinnules of this specimen are twice as long and are composed of 14 

 segments which, with the exception of the first two, are very slender. 



The ambulacral plating consists of prominent side and covering plates. The 

 sacculi are very small, on many pinnules not visible. In the specimen from Blake 

 station 241 the arms are about 90 mm. long, in that from Blake station 272 about 60 

 mm. long. 



In alcohol the color of the specimen from Blake station 241 is gray, that of the 

 specimen from Blake station 272 white. In both the cirri arc shining white. In the 

 specimen from Blake station 241 the division series are gray, in that from Blake station 

 272 almost white. The arms of both are light reddish gray, the pinnules and re- 

 generated arms white. 



The third specimen, from Blake station 219, according to Hartlaub, is to be referred 

 to this variety in spite of some deviations. This is a cotype of Carpenter's Antedon 

 pourtaUsi (see page 309), but it differs markedly from the holotype. 



The form of the centrodorsal resembles that of the specimen from Blake station 

 241, except that here there are prominent interradial ridges that are only indicated in 

 that specimen; weaker radial ridges are also present so that the cirri stand in columns, 

 three to a column. This regular arrangement of the cirri is indicated in both the other 

 specimens. 



The radials are oidy partially visible, near the interradial processes of the centro- 

 dorsal. All the IIBr series preserved are 2, and there are two IIIBr 2 and one IIIBr 

 4(3+4) series. The ornamentation of the division series, consisting of a high develop- 

 ment of the marginal frills of the ossicles as seen in the specimen from Blake station 

 241, is in general missing only here and there, small spines or dentations standing out 

 prominently along the edges of the ossicles. There is a median ridge on these ossicles, 

 but otherwise the dorsal surface is smooth. On a few of the elements of the IIBr series 

 there are already the stout spines that are so characteristic of the distal borders of the 

 brachials. 



