678 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



This specimen seemed to show that the records under the names of Antedon sarsii, 

 A. dentata or A. tenella for this region, in which Hathrometra sarsi would be among 

 associations entirely different from those in which it is normally found, were based in 

 reality upon this species of Trichometra, a genus normally occurring among the con- 

 ditions here obtaining, and I therefore feel little hestitation in grouping these records 

 under this specific head. 



In 1912 I inadvertently described under the name Trichometra delicata a new 

 species (Fariometra io) which had been dredged by the Siboga in the East Indies. 



In 1913 I recorded Trichometra delicata from Helga station CXX, southwest 

 of Ireland in 698 meters; but I now believe that the specimen in question is in reality 

 a small individual of Orthometra hibernica. 



In 1923 I recorded this species from southwest of Iceland where it had been 

 dredged by the Ingolj in 2075 meters. 



Genns NEPIOMETRA A. H. Clark 



Antedon (part) P. H. CARPENTER, Challenger Reports, Zoology, vol. 26, pt. 60, 1888, pp. 179, 187, 



and following authors. 



Thaumatometra (part) A. H. CLARK, Proc. Biol. Soc. Washington, vol. 21, 1908, p. 128. 

 Nepiomelra A. H. CLARK, Journ. Washington Acad. Sci., vol. 7, 1917, No. 5, p. 128 (referred to the 



Bathymetrinae), p. 130 (diagnosis; type species Antedon laevis P. H. Carpenter, 1888; range; 



included species); No. 16, p. 511 (in key; range); Unstalked crinoids of the Siboga-Exped., 1918, 



p. 245 (in key; range), p. 251 (key to the included species). (Not Nepiometra GISLEN, Rep. 



Swedish Deep Sea Exped., vol. 2, Zool., No. 4, 1951, p. 55, which refers to Phrixometra longipinna). 



Diagnosis. A genus of Bathymetrinae in which the cirri are about XXX, 

 with up to 30 segments, of which the longest are less than twice as long as broad 

 and the distal ones, which have slight dorsal keels, are no longer than broad; laterally 

 the axillaries are rugous, if not spinous, but otherwise the division series and proximal 

 brachials are smooth; the oral and genital pinnules are not abruptly differentiated 

 from each other; Pj has about 15 segments, of which the third is already longer than 

 broad and the following ones are progressively longer; the succeeding pinnules have 

 slightly longer and fewer segments; there are no marsupia on the genital pinnules. 



Type species. Antedon laevis P. H. Carpenter, 1888. 



Geographical range. Known only from the Meangis Islands near the Philippines. 



Bathymetrical range. 914 meters. 



[NOTES BY A.M.C.] Since four out of five species included in this genus at its 

 inception by Mr. Clark have now been transferred to the genus Fariometra, only the 

 type species Nepiometra laevis, known from a single specimen is left. This has 

 no very marked characters and were it not for the relatively shorter cirrus segments 

 I would have merged it also in the synonymy of Fariometra. Of the species which 

 have the longest cirrus segments less than twice as long as broad, laevis seems to have 

 most in common with Tonrometra multicirra, also from the East Indian area, though 

 the other species of Tonrometra are from the Southern Ocean. Both species have 

 about 30 cirrus segments of comparable shape (allowing for the smaller size of the 

 type of laevis) and proximal pinnules of similar proportions, P] having about 15 segments. 

 But multicirra has the joints of the longer pinnule segments markedly swollen and 

 spinous whereas the segments are hardly flared at all in laevis. Also the axillaries 

 of multicirra are quite smooth at the sides with no rugous patches. In some of the 



