

302 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



The disk, which has been thrown off, is closely granulated with small calcareous 

 granules. 



The color is yellowish, except in some of the basal arm parts where it is blackish 

 usually as far as the first brachial. 



Notes. In a second specimen the centrodorsal is flattened dorsally with the free 

 dorsal surface closely pitted. There are rather high interradial crests. There are 20 

 cirrus sockets, arranged in 10 groups. The cirri have been thrown off. 



The IBr axillaries have a well-marked median crest and one or two submedian 

 tubercles, and their borders are a little everted. There is a high keel also on the first 

 two elements of the IIBr series. The ossicles following are provided with high rounded 

 median knobs. Of the 9 IIBr series 7 are 4(3+4) and 2 are 2; there is a single IIIBr 

 2 series. The carination of the division series and arm bases is much less marked than 

 in the specimen first described, especially on the IBri, which is clearly visible; its margins 

 are a little everted, but the tubercles are rather insignificant. 



The 21 arms are 60 mm. long. There is a high keel on the first two brachials. 

 The brachials following are provided with high rounded median knobs. 



The proximal syzygies are usually between brachials 1+2 after a IIBr 4(3+4) 

 axillary, after a IIBr 2 axillary either between brachials 3 + 4 or between brachials 

 1+2 and 3 + 4. 



P D is about 9 mm. long with about 20 segments. The distal pinnules are 5 mm. 

 long with about 10 segments. 



The arm bases are dark colored. Arms regenerating from the first or third bra- 

 chials are yellowish. 



Gisl6n said that as to the arm sculpture Crinometm transversa resembles some of 

 Hartlaub's brevipinna varieties, decora (=insculpta) , gracilis, and tuberosa, and my 

 insculpta. But the middle pinnules of the arms are proportionately longer than in 

 most of the other Crinometras; the wall-sidedness of the basal arm parts and the cari- 

 nation of the proximal pinnules are not at all or only slightly developed. The mediodorsal 

 carina of the basal arm parts is more sharply set off than in any of the forms described 

 earlier. But above all, the transverse crest of the cirrus segments distinguishes trans- 

 versa at once from all the Crinometras so far described. 



There is no tangible difference between transversa and some of the forms of the 

 Insculpta type of Crinometra brevipinna. In certain of these forms the middle pinnules 

 are as long as they are in transversa, the carination of the lower pinnules is only 

 slightly developed, and the distal dorsal end of the cirrus segments, which are as short 

 as in transversa, bears a low transverse ridge or a pair of low tubercles (see page 291). 

 This last feature, however, was not known to Professor Gisle'n, since at the time he 

 wrote no detailed description of the cirri of any of these varieties had been published. 



As there is no single character or group of characters by which transversa may be 

 distinguished from certain varieties of the Insculpta type, I am considering transversa 

 as a variety of brevipinna, finding its proper place in the Insculpta type. 



The significance of the occurrence of a form of Crinometra brevipinna at St. Helena 

 is emphasized by the unrecorded occurrence of the remarkable Moiraster magnificus 

 (Bell), heretofore known only from St. Helena, off Puerto Rico. The U. S. National 

 Museum possesses a remarkably fine specimen with R=168 mm., r=43 mm. from 





