292 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



c'. Arms thick, the width at the first syzygy over 3 mm. when the length of the division series and 

 the first nine brachials is about 15 mm.; segments of the middle and distal pinnules short, 

 mostly not much longer than broad; the longest cirrus segments rarely as much as twice as 

 long as broad (off Heard Island, Southern Ocean and (?) off Adelie Land, Antarctica; 137- 



645 meters) Solanometra (p. 419) 



6 2 . Arms narrow and strongly carinate or with a large median tubercle on each brachial in the mid- 

 line; P! twice as long as P z (shores of the Antarctic continent; 13CMH4 meters). 



Anthometra (p. 448) 

 a'. Normally 10 radials and 20 arms (Southern Ocean; 20-1080 meters) ..Promachocrinus (p. 428) 



Genus FLOROMETRA A. H. Clark* 



Antedon (part) BELL, Proc. Zool. Soc. London, 1882, p. 651, and following authors. 



Comatula (part) CHIEECHIA, Rivista Marittima, vol. 18, 1885, p. 9. A. AGASSIZ, Bull. Mus. Comp. 

 Zool., vol. 21, No. 4, 1891, p. 197; vol. 23, No. 1, 1892, pp. 80, 82. 



Heliometra (part) A. H. CLARK, Smithsonian Misc. Coll., vol, 50, pt. 3, 1907, p. 351. 



Solanometra (part) A. H. CLARK, Amer. Journ. Sci., ser. 4, vol. 32, 1911, p. 128 (nomen nudum, the 

 remarks refer to this genus), p. 129 (characteristic antarctic genus; significance) ; Mem. Australian 

 Mus., vol. 4, 1911, p. 727 (type species Antedon antarctica; as here understood includes the species 

 now assigned to Florometra); Crinoids of the Indian Ocean, 1912, pp. 5, 6, 26 (same). VANET, 

 Bull. Mus. Hist. Nat., Paris, vol. 19, 1913, p. 33 (same). A. H. CLARK, Smithsonian Misc. 

 Coll., vol. 61, No. 15, 1913, p. 61 (restricted by the separation of Florometra from it). 



Floromelra A. H. CLARK, Smithsonian Misc. Coll., vol. 61, No. 15, 1913, p. 62 (subgenus of Pro- 

 machocrinus; no diagnosis; name used in combination with [Antedon eschrichli var.] magellanica 

 Bell); Bull. Inst. Oc&mogr. Monaco, No. 285, 1914, p. 3 (type species Antedon mariae A. H. 

 Clark, 1907; subgenus of Promachocrinus; includes Antedon asperrima, hondoensis, inexpectata, 

 laodice, magellanica, mariae, perplexa, rathbuni, serratissima and tanneri; range considered in 

 detail); Die Crinoiden der Antarktis, 1915, p. 132 (covering plates), p. 137 (synonymy; diagnosis; 

 type Antedon mariae A. H. Clark, 1907; range; list of records; table of depths and temperatures 

 in different regions), p. 190 (discussion), p. 194 (distribution in detail and its oceanographic 

 significance). F. W. CLARKE and WHEELER, U.S. Geol. Surv. Prof. Paper 90- L, 1915, p. 195 

 (inorganic constituents of the skeleton); Prof. Paper 102, 1917, pp. 23 and following (same). 

 A. H. CLARK, Journ. Washington Acad. Sci., vol. 7, No. 5, 1917, p. 127 (referred to the Helio- 

 metrinae); No. 16, p. 508 (in key; range; best considered as a subgenus of Promachocrinus); 

 Unstalked crinoids of the Siboga-Exped., 1918, p. 240 (in key; range; best considered as a sub- 

 genus of Promachocrinus; key to the included species). BATHER, Nature, vol. 107, March 31, 

 1921, p. 133. F. W. CLARKE and WHEELER, U.S. Geol. Surv. Prof. Paper 124, 1922, p. 20 (in- 

 organic constituents of the skeleton). A. H. CLARK, The Danish Ingolf-Exped., vol. 4, No. 5, 

 Crinoidea, 1923, p. 52 (in key; treated as a genus). GISLEN, Zool. Bidrag Uppsala, vol. 9, 1924, 

 p. 288; Vid. Medd. Nat. Foren. K0benhavn, vol. 83, 1927, p. 51 (color). EKMAN, Tiergeographie 

 des Meeres, 1935, p. 319. A. H. CLARK, Explorations des mers de PU.R.S.S., vol. 23, 1937, p. 217 

 (species very variable, limits not clear), p. 218 (in key) (in Russian), pp. 222, 224 (in English ver- 

 sion); Sci. Rep. Australasian Antarctic Exped., 1911-14, ser. C, vol. 8, pt. 4, 1937, p. 10, p. 14 

 (range). JOHN, Proc. Linn. Soc. London, sess. 149, pt. 2, 1937, p. 86 (two species in the Antarctic; 

 10 additional species); Discovery Reports, vol. 18, 1938, p. 130 (two Antarctic species); GISLEN, 

 Kungl. Svenska Vet.-Akad. Handl., ser. 3, vol. 17, No. 2, 1938, p. 21; JOHN, Rep. B.A.N.Z. 

 Antarctic Res. Exped. 1929-31, Ser. B, vol. 4, pt. 6, 1939, p. 198. VANEY and JOHN, Sci. Res. 

 Voy. Scotia, 1902-04, Crinoidea, 1939, pp. 667, 668 (pinnules; range). GISLEN, Rep. Swedish 

 Deep Sea Exped., vol. 2, Zool. No. 4, 1951, p. 55. HYMAN, The invertebrates, vol. 4, Echino- 

 dermata, 1955, p. 97 (Pacific distribution). 



Promachocrinus (Florometra) A. H. CLARK, Die Crinoiden der Antarktis, 1915, pp. 105, 106, 142. 



Diagnosis. A genus of Heliometrinae in which the arms are rounded dorsally; 

 the brachials are nearly or quite as long as broad and, like the elements of the division 

 series, have more or less spinous borders and commonly a greater or lesser development 



*i=ee also Addenda (pp. 836, 837) under 1962 and 1963. 



