668 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



time they have the synarthrial tubercles on the division series and first brachials very 

 reduced compared with the prominent ones of clio and of larger mariae. The shapes 

 of the cirrus segments are not unlike and the greater number in mariae might be attrib- 

 utable to size, but the elongate distal segments of P! with a complete lack of dorsal 

 processes in clio are very different from those found in mariae. Consequently I must 

 agree with Mr. Clark that clio is probably distinct. Nevertheless, until a good series 

 of small specimens of Florometra mariae has been described, the possibility that clio 

 represents the juvenile form cannot be forgotten. 



Gislen also described a specimen lacking cirri collected by Mortensen in the Sa- 

 gami Sea under the designation Ttiaumatometra cf. tennis. Its arm length is about 

 40 mm. The centrodorsal is subconical, 1.7 mm. in diameter by 1.0 mm. high, which 

 is very similar in relative height to that of the type of clio. The dorsal pole is a smooth 

 cone and the division series and first pairs of brachials have prominent synarthrial 

 tubercles in both. However, there are some differences with regard to the pinnules; 

 P! has only 17 to 18 segments in Gislen's specimen (30 to 32 in clio) and although P 2 

 is shorter in both with a comparable reduction in the number of segments, P 3 and P 4 

 are much longer than P 2 in Gislen's specimen, though similar to it in clio. The reduc- 

 tion in size of P 2 in the former might be attributable to its being the first genital pin- 

 nule, whereas in the type of clio it is P 3 which bears the first gonad. 



Genus TRICHOMETRA A. H. Clark 



Antedon (part) PouRTALfcs, Bull. Mus. Comp. Zool., vol. 1, No. 11, 1869, p. 356, and following 

 authors. 



Trichometra A. H. CLARK, Proc. Biol. Soc. Washington, vol. 21, 1908, p. 131 (diagnosis; type species 

 Antedon aspera A. H. Clark, women nudum), p. 136 (referred to the Antedonidae) ; Proc. U.S. 

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

 West Indies and the Hawaiian Islands) ; Amer. Nat., vol. 42, No. 503, 1908, p. 724 (color) ; Proc. 

 Biol. Soc. Washington, vol. 22, 1909, p. 176 (referred to the Heliometrinae) ; Mem. Australian 

 Mus., vol. 4, 1911, p. 727 (parent genus from which Hathrometra arose); Notes Leyden Mus., 

 vol. 34, 1912, p. 148 (cirri compared with those of Thaumatometra alcyori) ; Crinoids of the Indian 

 Ocean, 1912, p. 5 (East Indian genus, represented by local species and by the genus Hathrometra 

 in the Atlantic), p. 10 (occurs in Hawaii; absent from Japan), p. 11 (represented in the Ceylon 

 region), p. 26 (range; allied to Hathrometra), p. 62 (in key), p. 239 (original reference; type 

 species); Fisheries, Ireland, Sci. Invest., pt. 4, 1913, p. 3 (relation to Hathromelra; discussion); 

 Internat. Rev. gesamt. Hydrobiol. und H3'drogr., vol. 6, 1914, pp. 5 and following (both Atlantic 

 and Indo-Pacific; represents Hathrometra in part; range); Die Crinoiden der Antarktis, 1915, 

 p. 145 (synonymy; diagnosis; range), p. 182 (both Atlantic and Indo-Pacific; in the Indo-Pacific 

 represents the Atlantic Hathrometra); Journ. Washington Acad. Sci., vol. 7, 1917, No. 5, p. 128 

 (referred to the Bathymetrinae) ; No. 16, p. 511 (in key; range) ; Unstalked crinoids of the Siboga- 

 Exped., 1918, p. 245 (in key; range), p. 246 (key to the included species); Univ. Iowa Studies in 

 Nat. Hist., vol. 9, No. 5, 1921, p. 13 (West Indian and Indo-Pacific), p. 18 (in key); The Danish 

 Ingolf-Exped., vol. 4, No. 5, 1923, p. 11 (range), p. 43 (range), p. 53 (in key), p. 56 (key to the 

 Atlantic species). GISLEN, Ark. Zool., vol. 15, No. 23, 1923, p. 15 (flexible PI). MOHTENSEN, 

 Handbook of the echinoderms of the British Isles, 1927, p. 26 (in key), p. 37 (diagnosis), p. 38. 

 EKMAN, Tiergeographie des Meeres, 1935, p. 360. 'A. H. CLARK, Mem. Soc. Cubana Hist. Nat., 

 vol. 14, No. 2, 1940, p. 139 (cosmopolitan in deep water). ELIAS DA COSTA, Chaves dicot6micas 

 para a classificacao dos equinodermes Portugueses. IV. Crin6ides, Porto, 1940, p. 9 (in key), 

 p. 13. GISLEN, Rep. Swedish Deep Sea Exped., vol. 2, Zool., No. 4, 1951, pp. 55, 56 (depth 

 range) . 



Diagnosis. A genus of the Bathymetrinae in which the centrodorsal is hemispher- 

 ical to broadly rounded conical; the longest cirri have 33 to 45 segments, of which the 



