552 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



The first joint of all the pinnules is much wider than the second and following ones 

 as the second segment is narrower distally than proximally. 



The distal pinnules have a few simple ambulacral spicules in the form of rods bent 

 near the middle like boomerangs, with one end tapered and the other claviform and 

 more or less rugous. A few are forked. 



The first genital pinnule is P 4 or P 6 . 



Locality. 33 miles east of Pernambuco, Brazil; 42 meters; V. K. Cornish [A. H. 

 Clark, 1913] (1, B.M., No. 93.4.7.6). 



Remarks [by A.M.C.]. The discovery that the arrangement of the cirrus sockets 

 can better be described as columnar than alternating has necessitated the transfer of 

 this genus from the Antedoninae to the Zenometrinae. Mr. Clark himself commented on 

 the resemblance of the centrodorsal to that of Hathrometra (now Poliometra) prolixa. 



Genus LEPTOMETRA A. H. Clark* 



Alecto (part) J. MILLER, Monatsb. Preuss. Akad. Wiss., 1841, p. 182, and following authors. 



Comatula (Alecto) (part) J. MULLER, Abh. Preuss. Akad. Wiss. for 1847, 1849, p. 253. 



Comatula (part) BARRETT, Ann. Mag. Nat. Hist., ser. 2, vol. 19, 1857, p. 33, and following authors. 



Antedon (part) NORMAN, Ann. Mag. Nat. Hist., ser. 3, vol. 15, 1865, p. 104, and following authors. 



Leptometra A. H. CLARK, Proc. Biol. Soc. Washington, vol. 21, 1908, p. 129 (type Alecto phalangium 

 J. Miiller, 1841), p. 136 (referred to the Antedonidae) ; Proc. U.S. Nat. Mus., vol. 34, 1908, p. 211 

 (referred to the Antedonidae, restricted) ; Amer. Nat., vol. 42, No. 500, 1908, p. 542 (characteristic 

 of the Mediterranean-northeast Atlantic fauna) ; No. 503, p. 724 (color) ; Proc. Biol. Soc. Wash- 

 ington, vol. 22, 1909, p. 176 (referred to the Zenometrinae) ; Vid. Medd. Nat. Foren. K0benhavn, 

 1909, p. 128 (East Indian in origin; most closely related to Psathyromelra) ; Proc. U.S. Nat. Mus., 

 vol. 38, 1910, p. 331 (an Indian Ocean genus; an intrusion into the Atlantic area); vol. 40, 1911, 

 p. 9 (with Antedon characterizes the European faunal area), p. 10 (closely related to the East 

 Indian Psathyrometra) ; Amer. Journ. Sci., ser. 4, vol. 32, 1911, p. 131 (significance in the Euro- 

 pean fauna; origin); in Michaelsen and Hartmeyer, Die Fauna Svidwest-Australiens, vol. 3, Lief. 

 13, Crinoidea, 1911, p. 449 (Mediterranean species with long, Atlantic with short arms); Mem. 

 Australian Mus., vol. 4, 1911, p. 726 (closely resembles Psathyrometra; route by which it reached 

 Europe) ; Crinoids of the Indian Ocean, 1912, p. 13 (closely related to and derived from Psathyro- 

 metra; characteristic of the Mediterranean and east Atlantic faunas), p. 21 (route by which it 

 reached Europe), p. 26 (range); Internat. Rev. gesamt. Hydrobiol. und Hydrogr., vol.6, 1914, p. 5 

 (origin and range) ; in Michaelsen and Hartmeyer, Beitrage zur Kenntnis der Meeresfauna 

 Westafrikas, Echinod. u, Crinoidea, 1914, p. 311 (origin and range) ; Die Crinoiden der Antarktis, 

 1915, p. 114 (in key to the genera of Zenometrinae), p. 182 (range; eastern representative), p. 190 

 (occurrence in the Mediterranean); Journ. Washington Acad. Sci., vol. 7, 1917, No. 5, p. 127 

 (referred to the Zenometrinae); No. 16, p. 509 (in key; range) ; Unstalked crinoids of the Siboga- 

 Exped., 1918, p. 222 (in key; range), p. 231 (key to the included species); Smithsonian Misc. 

 Coll., vol. 72, No. 7, 1921, p. 28 (color). KOEHLER, Faune de France, 1, Echinodermes, 1921, 

 p. 192 (morphology), p. 193 (history), p. 194 (in key), p. 197 (diagnosis; beautiful green in life; 

 French species). A. H. CLARK, The Danish Ingolf-Exped., vol. 4, No. 5, Crinoidea, 1923, p. 53 

 (in key), p. 56 (key to species). GISLEN, Ark. Zool., vol. 15, No. 23, 1923, p. 15; Vid. Medd. Nat. 

 Foren. K0benhavn, vol. 83, 1927, pp. 6, 39. MORTENSEN, Handbook of the echinoderms of the 

 British Isles, 1927, p. 26 (in key), p. 34 (diagnosis). KOEHLER, Les Echinodermes des mers 

 d'Europe, vol. 2, 1927, p. 115 (green color), p. 116 (in key), p. 130 (diagnosis), p. 131 (key to 

 species). RIVERA, Bol. Pesc. Madrid, vol. 14, 1929, p. 50 (in key). NOBRE, Echinodermes de 

 Portugal, 1931, p. 164 (diagnosis), p. 165. BUEN, Bol. Soc. Esp. Hist. Nat., Madrid, vol. 34, 

 1934, pp. 440, 442, 443, 444. TORTONESE, Atti Soc. Ital. Sci. Nat., vol. 75, 1936, p. 280; Boll. 

 Mus. Zool. Univ. Torino, vol. 46, ser. 3, No. 82, 1938, pp. 45, 46 (brief diagnosis). NOBRE, 

 Echinodermes de Portugal, ed. 2, 1938, p. 186 (in key), p. 188. ELIAS DA COSTA, Chaves dicot6- 



* See also Addenda (p. 838) under 1965. 



