PART 5 A MONOGRAPH OF THE EXISTING CRENOIDS 671 



Geographical range. This species is only known from the Hawaiian Islands. 



Bothy metrical range. From 256 (7252) to 590 (?648) meters; the average of 6 

 records is 505 meters. 



Thermal range. From 6.50 C. to 15.67 (?15.83) C.; the average of 6 records is 

 9.09 C. 



TRICHOMETRA CUBENSIS (Pourlalis) 



[See vol. 1, pt. 1, figs. 221 (p. 243), 291 (p. 262), 389 (p. 307) ; pt. 2, figs. 99-100 (p. 62), 766 (p. 362)] 



Antedon cubensis POURTALES, Bull. Mus. Comp. Zool., vol. 1, No. 11, 1869, p. 356 (Bibb sta. 139P); 

 vol. 5, No. 9, 1878, p. 214 (type of cubensis, but not the other specimens mentioned, which are 

 Alelecrinus balanoides). P. H. CARPENTER, Trans. Linn. Soc. (Zool.), ser. 2, vol. 2, 1879, p. 29 

 (listed as an Antedon); Bull. Mus. Comp. Zool., vol. 9, No. 4, 1881, p. 165 (explanation of Pour- 

 tales' confusion of this form with Atelecrinus balanoides). BELL, Proc. Zool. Soe. London, 1882, 

 p. 533 (listed). P. H. CARPENTER, Proc. Zool. Soc. London, for 1882, 1883, p. 746 (specific for- 

 mula). MINCKERT, Arch. Naturg., Jahrg. 71, vol. 1, Heft 1, 1905, p. 167, footnote (syzygies). 

 A. H. CLARK, Proc. U.S. Nat. Mus., vol. 34, 1908, p. 466. HARTLAUB, Mem. Mus. Comp. Zool., 

 vol. 27, No. 4, 1912, p. 280 (listed), pp. 385-389 (detailed description and discussion), pi. 9, figs. 

 6, 10-12, pi. 15, fig. 4 [fig. 13, pi. 9 and fig. 3, pi. 15 represent Coccometra nigrolineata]. 



Antedon aspera A. H. CLARK, Proc. Biol. Soc. Washington, vol. 21, 1908, p. 131 (nomen nudum). 



Trichometra aspera A. H. CLARK, Proc. Biol. Soc. Washington, vol. 21, 1908, p. 132 (nomen nudum); 

 Proc. U.S. Nat. Mus., vol. 34, 1908, p. 218 (compared with T. vexator), p. 229 (description; Alba- 

 tross sta. 2666) ; Smithsonian Misc. Coll., vol. 52, pt. 2, 1908, p. 232 (compared with T. [Fario- 

 metra] explicala); Bull. Mus. Hist. Nat., Paris, No. 4, 1911, p. 259 (proximal pinnules compared 

 with those of T. delicatd); Notes Leyden Mus., vol. 34, 1912, p. 146 (compared with T. delicata 

 [Nepiometra id\). 



Trichometra, sp. A. H. CLARK, Fisheries, Ireland, Sci. Invest., 1913, pt. 4, p. 3 (eastern coast of North 

 America; related to T. [Orthometra] hibernica, but has considerably longer cirri composed of longer 

 segments). 



Trichometra cubensis A. H. CLARK, Unstalked crinoids of the Siboga-Exped., 1918, p. 247 (in key; 

 range; detailed synonymy), p. 248 (Albatross stas. 2400, 2415, 2661, 2663, 2666, 2668, 2669, 

 2528; 4316' N., 6035' W., 630 m.; SW. part of Banquereau, 540 m.; Banquereau, 450 m.; Fish- 

 ing Banks); The Danish Ingolf-Exped., vol. 4, No. 5, Crinoidea, 1923, p. 11 (Ingolf stas. 24, 25, 

 27, 45, 64, 73, 84, 85; notes), p. 43 (range), p. 56 (in key). MORTENSEN, Handbook of the echi- 

 noderms of the British Isles, 1927, p. 38 (range); Medd. Gr0nland, vol. 79, No. 2, 1932, p. 50 

 (range). A. H. CLARK, Mem. Soc. Cubana Hist. Nat., vol. 14, No. 2, 1940, p. 141 (in key), 

 p. 159 (references). H. L. CLARK, Mem. Soc. Cubana Hist. Nat., vol. 15, No. 1, 1941, p. 12 

 (Atlantis sta. 3305). EINARSSON, The zoology of Iceland, vol. 4, pt. 70, 1948, p. 6 (Iceland 

 records), p. 48 (member of the fauna of the Atlantic slope and deep sea), pp. 58, 61 (distribu- 

 tion). A. H. CLARK, Bull. U.S. Fish. Comm., vol. 55, 1954, p. 374 (listed). HTMAN, The 

 invertebrates, vol. 4, Echinodermata, New York, 1955, p. 113. 



Diagnostic features. In this species the cirrus segments are 25-35, fewer than 

 in T. vexator, but about the same in number as in T. delicata; it is distinguished from 

 the latter by the sharp flattening of the sides of the IBr series and lower brachials, 

 by the superior size, and by the stouter cirri in which the segments beyond the twelfth 

 are about as long as broad. 



From Hathrometra tenella, with which this species has been confused, it may easily 

 be distinguished by the much shorter earlier cirrus segments, the close apposition 

 and lateral flattening of the elements of the IBr series and the earlier brachials, and 

 by the prominent spinous eversion of the distal ends of the earlier brachials. 



[NOTE BY A.M.C.] The following description appears to have been taken from 

 that of the type of aspera from Albatross station 2666, with minor modifications of 

 size and number of cirrus segments. 



