268 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



When the specimen reached me ten years later it was yellow-brown with the cirri 

 and pinnules purple. 



Locality Mabahiss station 24; Gulf of Aden (lat. 1153'42" N., long. 

 5113'12" E.); 73-220 meters; October 9, 1933 [A. H. Clark, 1936] (1, B. M.). 



Remarks. As yet this interesting species is known only from the single individual 

 dredged by the Mabahiss. 



TROPIOMETBA AFRA AFRA (Har(laub) 



PLATE 31, FIGURES 166, 167; PLATE 32, FIGURE 168; PLATE 33, FIGURE 174 



[See also vol. 1, pt. 1, fig. 88 (lateral view), p. 145; pt. 2, fig. 116 (division series), p. 79; fig. 167 

 (division series), p. 86.] 



Antedon afro. HARTLAUB, Nachr. Ges. Gottingen, May 1890, p. 172 (description; Bowen, Queensland); 

 Nova Acta Acad. German., vol. 58, No. 1, 1891, p. 86 (Bowen; detailed descriptions and com- 

 parisons), pi. 5, figs. 50, 52. HAMANN, Bronns Klassen und Ordnungen des Tier-Reichs, vol. 2, 

 Abt. 3, 1907, p. 1579 (listed). A. H. CLARK, Proc. U. S. Nat. Mus., vol. 34, 1908, p. 481 (related 

 to A. macrodiscus) ; Vid. Medd. Naturh. Foren. K0benhavn, 1909, p. 117 (= Tropiometra afro); 

 Mem. Australian Mus., vol. 4, 1911, p. 718 (of Hartlaub, 1890, 1891=7'. afro); Smithsonian 

 Misc. Coll., vol. 60, No. 10, 1912, p. 2 (same); Crinoids of the Indian Ocean, 1912, p. 37 (same). 



Tropiometra afra A. H. CLARK, Smithsonian Misc. Coll., vol. 50, pt. 3, 1907, p. 349 (listed); Proc. 

 U. S. Nat. Mus., vol. 34, 1908, p. 315 ("South Pacific"; specimens from Sagami Bay are macro- 

 discus); Amer. Nat., vol. 42, No. 503, 1908, p. 725 (color); Geogr. Journ., vol. 32, No. 6, 1908, 

 p. 607 (color); Vid. Medd. Naturh. Foren. K0benhavn, 1909, p. 184 (synonymy; considered as 

 including macrodiscus; Bowen, Queensland; "South Pacific," probably Australia; characters of 

 the specimens; specimens from near the Goto Islands and from Misaki are macrodiscus); Die 

 Fauna Siidwest-Australiens, vol. 3, Lief. 13, 1911, p. 440 (East Indian species occurring south 

 to Bowen), p. 443 (range on the east coast); Mem. Australian Mus., vol. 4, 1911, p. 718 (iden- 

 tity), p. 721 (occurs south to Bowen), p. 735 (in key), p. 780 (annotated synonymy; characters; 

 Australian records; range); Smithsonian Misc. Coll., vol. 60, No. 10, 1912, p. 2 (identity), 

 p. 28 (Bowen; Hartlaub's type; description; macrodiscus a good species); Crinoids of the Indian 

 Ocean, 1912, p. 23 (range), p. 37 (identity), p. 176 (synonymy: considered as including macro- 

 discus; range); Rec. Western Australian Mus., vol. 1, pt. 3, 1914, p. 114 (collected by the En- 

 deavour in Western Australia), p. 115 (Australian tropical species; previously known only from 

 Bowen), p. 125 (between Fremantle and Geraldton, 60-80 fins.; characters of the specimens; 

 history; comparison with macrodiscus); Beitrage zur Kenntnis der Meeresfauna Westafrikas, 

 Echinod. II, Crinoidea, 1914, p. 312 (range). ALEXANDER, Rec. Western Australian Mus., 

 vol. 1, pt. 3, 1914, p. 108 (between Fremantle and Geraldton). >A. H. CLARK, Internat. Rev. 

 gesamt. Hydrobiol. und Hydrogr., 1915, p. 225 and following (detailed account of distribution 

 in Australia). H. L. CLARK, Carnegie Inst. Washington Publ. 212, 1915, p. 106 (southwestern 

 reef-flat, Maer), p. Ill and following (habits and reactions). A. H. CLARK, Unstalked crinoids 

 of the <Sz'6offa-Exped., 1918, p. ix (relationship with T. macrodiscus), p. 131 (in key; range), 

 p. 132 (notes; Sta. 164), p. 273 (listed), pi. 28, fig. 106. H. L. CLARK, Echinoderm fauna of 

 Torres Strait, 1921, p. 8 (secured by the Carnegie Exped.), p. 25 (Mer; color; habits). GISLEN, 

 Nova Acta Reg. Soc. Sci. Upsaliensis, ser. 4, vol. 5, No. 6, 1922, pp. 7, 9, 91, 92 (Africa, Aus- 

 tralia, New Guinea). A. H. CLARK, John Murray Exped. 1933-34, Sci. Reports, vol. 4, No. 4, 

 1936, p. 91 (compared with T. magnifica, new species), p. 105. H. L. CLARK, Echinoderm 

 fauna of Australia, 1946, p. 53 (localities; notes). 



Antedon afer (Ltttken, MS.) A. H. CLARK, Vid. Medd. Naturh. Foren. K0benhavn, 1909, p. 117 

 (= Tropiometra afra). 



Diagnostic jeatures. A large stout form with the dorsal surface of the arms 

 smooth, without any trace of a median carination. The cirri are XXIII-L (averaging 

 XXXI), 21-35 (average 29), 25-40 (averaging 35) mm. long. The arms are 190-220 

 (averaging 200) mm. long. 



