658 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



The color of the first four or five cirrus segments was yellow, the rest were dusky; 

 otherwise the specimen was light yellow. 



The marsupia are very large and extend further distally than the ovaries. The 

 transparent walls are often ruptured. The ovary lies a little to the adoral side of the 

 pinnule, with the marsupium mainly on the aboral side but extending distally across 

 the ventral side of the ovary onto the adoral side, so that it is comma-shaped. The 

 embryos are in various stages of development, but the most highly developed are 

 towards the distal end, which appears to be the most easily ruptured part. A large 

 marsupium has about 1 7 embryos, which are arranged in an irregular double layer and 

 are in various developmental stages. Since the most advanced are at the distal end, 

 it is presumed that the eggs pass from the ovary into the proximal part of the pouch. 

 The fully formed larvae are similar to, but larger than, those of the first specimen, being 

 0.30 to 0.36 mm. long. 



Some males also from station 1948 are larger, with the ossicles of the division 

 series and lower brachials relatively wider and more massive. The cirri are longer. 

 In two specimens P 3 is the first genital, in the third it is P 2 . PI has 19 to 20 segments, 

 and is 5 or 6 mm. long. When P 2 is genital it has 12 segments, 4 mm. long. The testes 

 are long fusiform bodies, the biggest lying along the third to eighth segments of the 

 genital pinnules. The disk is naked, the anal cone high. 



Localities. Discovery Investigations station 156; off South Georgia (lat. 5351' 

 S., long. 3621' W.); 200-236 meters; rock; January 20, 1927 [John, 1938] (1, the 

 lectotype, B.M.). The type locality as now restricted. 



Discovery Investigations station 1948; east of Clarence Island (lat. 6049' S., long. 

 5240' W.); 490-610 meters; January 4, 1937 (4 syntypes, B.M.). 



Geographical range. From South Georgia and the Bransfield Strait area. 



Bathymetrical range. From 200 to 610 meters. 



PHRIXOMETRA EXIGUA (P. H. Carpenter)* 



FIGURE 37 



Anledon exigua P. H. CARPENTER, Challenger Reports, Zoology, vol. 26, pt. 60, 1888, p. 178, pi. 32, figs. 

 1-4 (description; localities; affinities); Journ. Linn. Soc. (Zool.), vol. 24, 1891, p. 61 (intersyzygial 

 interval). HAKTLAUB, Bull. Mus. Comp. Zool., vol. 27, No. 4, 1895, p. 143 (range). GRIEG, 

 Bergens Mus. Aarb. for 1903, No. 5, 1904, p. 28 (intersyzygial interval). DODERLEIN, Fauna 

 Arctica, vol. 4, Lief. 2, 1905, p. 405 (antarctic representative of the Tenella group). HAMANN, 

 Bronn's Klassen und Ordnungen des Tier-Reichs, vol. 2, Abt. 3, 1907, p. 1579 (listed). A. H. 

 CLARK, Smithsonian Misc. Coll., vol. 50, pt. 3, 1907, p. 353 (listed); Crinoids of the Indian Ocean, 

 1912, p. 33 (of Carpenter, 1888= Thaumatometra exigua); Unstalked Crinoids of the Siboga- 

 Exped., 1918, p. 246 (referable to Hathrometra). 



Thaumatometra exigua A. H. CLARK, Proc. Biol. Soc. Washington, vol. 21, 1908, p. 128 (listed); Crin- 

 oids of the Indian Ocean, 1912, p. 33 (= Anledon exigua), p. 246 (synonymy; localities); Smith- 

 sonian Misc. Coll., vol. 61, No. 15, 1913, p. 66 (published reference to specimens in the B.M.; 

 Challenger sta. 145). 



Halhrometra exigua A. H. CLARK, Bull. Inst. Ocfenogr. Monaco, No. 285, 1914, p. 20 (closely related 

 to H. tenella; range); Journ. Washington Acad. Sci., vol. 5, No. 3, 1915, p. 81 (Antarctic; depth); 

 Die Crinoiden der Antarktis, 1915, p. 105 (collected by the Challenger), p. 107 (in key to Antarctic 

 crinoids), p. 144 (synonymy; localities; discussion), p. 168 (range), p. 169 (relationships).- GISLEN, 

 Ark. Zool., vol. 15, No. 23, 1923, p. 16 (in key), p. 30 (range); vol. 19, No. 32, 1928, p. 11 (notes). 



Retiometra exigua A. H. CLARK, Proc. U. S. Nat. Mus., vol. 83, 1936, p. 248 (listed). 



* See also Addenda (p. 837) under 1963. 



