276 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



Diagnosis. A genus of Capillasterinae including species in which the arms are 

 10 in number; all the pinnules a^e present; the first and second segments of the 

 proximal pinnules bear a very high and broad carinate process, of which the crest, at 

 least on the second segment, is parallel with the longitudinal axis of the pinnule; the 

 terminal combs on the proximal pinnules consist of 13-15 teeth, which are only 

 slightly higher than the width of the segments bearing them and are confined to the 

 distal half of the pinnule; none of the segments of the proximal pinnules are more 

 than very slightly longer than broad; there is no modification of the dorsal surface 

 of the lower brachials; the cirri are slender, but not excessively so, with the last 2 

 segments little or not at all longer than broad; and the arms more than 20 mm. in 

 length. 



Geographical range. -Throughout the Caribbean Sea and Gulf of Mexico. 



Thermal range. From 8.33 C. to 24.72 C. 



Remarks. This is a rather well marked genus of somewhat uncertain affinities. 

 It is possibly most closely related to Comanthoides of southeastern Australia, which 

 also has the basal segments of the proximal pinnules crested. 



LEPTONEMASTER VENUSTUS A. H. Clark 



Plate 22, Figures 59-61 



[See also vol. 1, pt. 1, fig. 57 (comb), p. 83; fig. 234 (ventral view of centrodorsal), p. 247; fig. 325 

 (cirrus), p. 279; fig. 452 (dorsal view of radial pentagon), p. 353; part 2, figs. 11, 12 (centro- 

 dorsal and radials), p. 6; fig. 236 (arm), p. 197; figs. 389, 390 (pinnule tip), p. 245; fig. 686 

 (disk), p. 341; fig. 783 (adambulacral deposits), p. 366] 



Actinometra meridionalis var. carinata (P. H. Carpenter, MS.) VON GRAFF, Bull. Mus. Comp. 

 Zool., vol. 11, No. 7, 1883, pp. 130, 131 (nomen nudum; off Grenada, 262 fathoms; myzos- 

 tomes); Challenger Reports, Zoology, vol. 10, pt. 27, 1884, pp. 19, 51, 52, 53, 68 (Blake stations 

 249, 203; myzostomes). BKAUN, Centralbl. f. Bakteriol. u. Parasitenkunde, vol. 3, 1888, 

 pp. 186, 210 (myzostomes; after von Graff). HARTLATJB, Mem. Mus. Comp. Zool., vol. 27, 

 No. 4, 1912, p. 421 (Blake stations 249, 203; myzostomes). BOTJLBNGER, British Antarctic 

 (Terra Nova} Exped., 1910, Nat. Hist. Report, Zoology, vol. 2, No. 6, Jan. 22, 1916, p. 136 

 (host of Myzostomum cysticolum). 



Leptonemasler venustus A. H. CLARK, Proc. U. S. Nat. Mus., vol. 36, 1909, p. 499 (Grampus station 

 5104; description); Proc. U. S. Nat. Mus., vol. 40, 1911, p. 17 (arms compared with those of 

 Comissia ignota, sp. nov.); Smiths. Miscell. Coll., vol. 61, No. 15, 1913, p. 7 (Cuba); Univ. 

 Iowa, Studies in Nat. Hist., vol. 9, No. 5, 1921, p. 8 (obtained by the Barbados-Antigua expe- 

 dition) ; pp. 10, 11 (occurrence at Barbados) ; p. 24 (stations, 3, 7, 11, 13, 18, 46, 56, 59, 67, 78); 

 p. 27 (listed); Smiths. Miscell. Coll., vol. 72, No. 7, 1921, pi. 1, fig. 15 (terminal comb); pi. 2, 

 fig. 19 (ambulacral deposits); The Danish 7ngoZ/-Exped., vol. 4, No. 5, Crinoidea, 1923, p. 39 

 (range). GISLN, Zool. Bidrag fran Uppsala, vol. 9, 1924, p. 39, footnote (disk reaches to 

 brachial 5). 



Actinometra echinoptera var. carinata HARTLAUB, Mem. Mus. Comp. Zool., vol. 27, No. 4, 1912, 

 p. 416 (Blake stations 127, 155, 177, 178); p. 417 (stations 203, 246, 249, 298, 10-1880; 18 

 13' 20" N., 78 36' 40" W., 103 fathoms; ?loc.); p. 418 (Santa Cruz; Dominica; Martinique; 

 Grenada; 18 13' 20" N., 78 36' 40" W.; ?38, 88-262 fathoms); pp. 433-435 (detailed descrip- 

 tion and comparisons); pi. 16, figs. 6, 14; pi. 17, figs. 1, 2, 11, 12. 



Actinomelra echinoptera var. carinata-pulchella HARTLAUB, Mem. Mus. Comp. Zool., vol. 27, No. 4, 

 1912, p. 416 (Blake station 155); p. 418 (Montserrat, 88 fathoms); p. 435 (in text). 



Actinometra echinoptera var. carinala-discoidea HAKTLAUB, Mem. Mus. Comp. Zool., vol 27, No. 4, 

 1912, p. 417 (Blake station 7246); p. 418 (Grenada, 154 fathoms); p. 469 (Grenada, 154 fath- 

 oms [or Martinique, 96 fathoms]; description); pi. 17, figs. 8, 16, 17, 19. 



