742 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



in the British Museum for comparison. Judging from the written descriptions, it is 

 possible that they are congeneric and certainly parvula, with all its cirrus segments 

 (except the first one) longer than broad, runs down to Thaumatometra in the key to 

 the genera of Bathymetrinae left by Mr. Clark. However, there are a number of 

 differences, notably in the shape of the centrodorsal and the proportions of the outer 

 cirrus segments, the penultimate of tennis being twice as long as broad while the longest 

 segments are about four times as long as broad, compared to "slightly longer than 

 broad" in parvula when the longest segments are nearly six times as long as broad. 

 There are also some differences in the shapes of the division series and brachinls. 



Dr. H. L. Clark thought that his europacifica (i.e., parvula) is closely related to 

 Trichometra minutissima from Brazil, which Mr. Austin Clark has since removed to 

 the genus Thaumatometra. 



F. parvula differs from the other species of Fariometra in the much longer cirrus 

 segments, the longest ones being nearly six times as long as broad, whereas hi the 

 others these segments are rarely more than three times as long as broad. Geographi- 

 cally also parvula is marked off from the exclusively Indo-West Pacific species of 

 Fariometra, whereas Thaumatometra does include species from north of Japan and the 

 Bering Sea, faunal areas more closely allied to the East Pacific fauna. 



Genus THAUMATOMETRA A. H. Clark 



Antedon (part) P. H. CARPENTER, Quart. Journ. Mior. Sci., new ser., vol. 27, 1887, p. 386, and fol- 

 lowing authors. 



Thaumatometra A. H. CLARK, Proc. Biol. Soc. Washington, vol. 21, 1908, p. 127 (diagnosis; type species 

 Antedon ciliata A. H. Clark, 1907 = 4. tenuis A. H. Clark, 1907), p. 128 (reaches the maximum 

 size in the northern part of the Sea of Japan), p. 136 (referred to the Antedonidae) ; Proc. U.S. 

 Nat. Mus., vol. 34, 1908, p. 211 (referred to the Antedonidae, restricted), p. 212 (range), p. 274 

 (comparison with Decametrocrinus [Thaumatocrinus] and Pentametrocrinus) ; Amer. Nat., vol. 42, 

 1908, No. 503, p. 721 (large size in the Sea of Japan), p. 725 (color); Geogr. Journ., vol. 32, No. 

 6, 1908, p. 603 (range), p. 605 (ecology); Proc. Biol. Soc. Washington, vol. 22, 1909, p. 177 

 (referred to the Bathymetrinae); Amer. Journ. Sci., ser. 4, vol. 32, 1911, p. 129 (characteristic of 

 the Japanese fauna; significance); Notes Leyden Mus., vol. 34, 1912, p. 148; Crinoids of the 

 Indian Ocean, 1912, p. 11 (occurs both east and west of Ceylon), p. 12 (represented in the Red 

 Sea region; doubtless occurs in the southeast African region), p. 17 (significance of the condi- 

 tions in this genus in southern Japan), p. 26 (range), p. 61 (in key), P- 245 (original reference; 

 type species); Internat. Rev. gesamt. Hydrobiol. und Hydrogr., vol. 6, 1914, pp. 6 and fol- 

 lowing (occurs in both Atlantic and Indo-Pacific; range); Die Crinoiden der Antarktis, 1915, p. 

 147 (synonymy; range; as here used includes abyssorum, alternate,, comaster, cypris, isis, parva, 

 parvula, tenuis [including ciliata], thysbe, and 2 undescribed species), p. 182 (both Atlantic and 

 Indo-Pacific; range); Journ. Washington Acad. Sci., vol. 7, 1917, No. 5, p. 128 (referred to the 

 Bathymetrinae); No. 16, p. 512 (in key; range); Unstalked crinoids of the Siboga-Exped., 1918, 

 p. 246 (in key; range), p. 254 (key to the included species). BATHER, Nature, vol. 107, 1921, 

 pp. 132, 133 (early stages). GISLEN, Nova Acta Reg. Soc. Sci. Upsaliensis, ser. 4, vol. 5, No. 6, 

 1922, p. 144, p. 147 (no dorsal prominences on distal cirrus segments of small species). A. H. 

 CLARK, The Danish Ingolf-Exped., vol. 4, No. 5, Crinoidea, 1923, pp. 12, 43 (range), p. 53 (in 

 key), p. 56 (key to the Atlantic species). GISLEN, Vid. Medd. Nat. Foren. K0benhavn, vol. 83, 

 1927, pp. 51, 52. MORTENSEN, Handbook of the echinoderms of the British Isles, 1927, pp. 26, 

 27 (in key). EKMAN, Tiergeographie des Meeres, 1935, p. 360. JOHN, Proc. Linn. Soc. London, 

 sess. 149, pt. 2, 1937, p. 86 (discussion), p. 87 (doubtful position of Antarctic species). A. H. 

 CLARK, Sci. Rep. Australasian Antarctic Exped. 1911-14, ser. C, vol. 8, pt. 4, 1937, p. 6 (widely 

 distributed; nutrix doubtfully in this genus); Explorations des mers de 1'U.R.S.S., vol. 23, 1937, 

 p. 218 (in key), p. 222 (in Russian), pp. 229, 230 (in English version). DJAKONOV, Bull. Pacific 



