A MONOGRAPH OF THE EXISTING CRINOIDS 243 



Expedition published in 1918 Perissometra crassa was redescribed and figured, and 

 P. gorgonia was described on the basis of a specimen from station 294, notes being given 

 on another from station 254. In the key to the species of Perissometra, gorgonia was 

 placed in the section including species with 14-20 (usually 20) arms, while crassa was 

 placed in the section including species with not more than 13 arms, and was said to 

 have 10 or 11 stout arms; gorgonia was said to have the brachials with prominent 

 swollen and produced distal borders, while in crassa the brachials were said to have an 

 unmodified dorsal sin-face; this, however, refers to the absence of median keels or 

 tubercles, for the figure of crassa shows the brachials with prominent distal ends. 



In 1927 Prof. Torsten Gislen wrote that crassa should be referred to the genus 

 Glyptometra. In 1929 I published notes on two specimens tentatively referred to 

 Perissometra gorgonia which had been brought up from 560 fathoms south of the Nicobar 

 Islands by the cable repair ship Patrol, and in the same paper I compared Perissometra 

 crassa with a new species P. occidentalis. In 1934 Professor Gislen listed Perissometra 

 crassa among the comatulids with the Heterometra bengalensis type of arm division, 

 and P. gorgonia among the species with the Comanthus solaster type of arm division. 



GLYPTOMETRA INAEQUALIS (P. H. Carpenter) 



[See vol. 1, pt. 1, figs. 274, p. 260, 491, p. 367; pt. 2, pi. 3, figs. 986, 987, pi. 27, fig. 1168, pi. 42, figs- 

 1267-1269, 1273-1275, pi. 44, figs. 1291, 1298, 1299, 1302-1304.] 



Antedon inaequalis von Graff, Challenger Reports, Zoology, vol. 10, pt. 27, 1884, pp. 18, 30, 31, 55, 

 70, 73 (Challenger stations 170, 174; myzostomes; nomen nudum). — P. H. Carpenter, Challenger 

 Reports, Zool., vol. 11, pt. 32, 1884, p. 83, pi. 54, fig. 8 (ambulacral plating of a pinnule). — von 

 Graff, Challenger Reports, Narrative, vol. 1, pt. 1, 1885, p. 316 (myzostomes). — P. H. Carpenter, 

 Challenger Reports, Zoology, vol. 26, pt. 60, 1888, p. 244 (description; Challenger stations 170A, 

 174, B, C, or D, 175), pi. 2, figs. 5, a-d; pi. 51, fig. 2; text fig. 5A, p. 246.— Braun, Centralbl. 

 Bakteriol. Parasitenkunde, vol. 3, 1888, pp. 185, 210 (myzostomes; after von Graff). — Hutton, 

 Index faunae Novae Zealandiae, 1904, p. 290 (listed). — Minckert, Arch. Naturg., Jahrg. 71, 1905, 

 vol. 1, Heft 1, p. 224 (regeneration). — Hamann, Bronn's Klassen und Ordnungen des Tier-Reichs, 

 vol. 2, Abt. 3, 1907, p. 1582 (listed).— A. H. Clark, Crinoids of the Indian Ocean, 1912, p. 35 

 (identity). — Hartlaub, Mem. Mus. Comp. Zool., vol. 27, No. 4, 1912, pp. 285, 306 (in Granulifera 

 group; believed a synonym of granulifera), pp. 289, 298 (description; discussion), fig. 2, p. 288, 

 fig. 36, p. 291, figs. 7, a-d, p. 297. 



Anledon inequalis Springer, Mem. Mus. Comp. Zool., vol. 25, No. 1, 1901, p. 45 (tegminal plates). 



Charitometra inaequalis A. H. Clark, Smithsonian Misc. Coll., vol. 50, pt. 3, 1907, p. 361 (listed) ; 

 Smithsonian Misc. Coll., vol. 52. No. 2, 1908, p. 227 (compared with Ch. smilhi [distincta]) . 



Pachylometra inaequalis A. H. Clark, Proc. Biol. Soc. Washington, vol. 22, 1909, p. 21 (listed) ; Crinoids 

 of the Indian Ocean, 1912, p. 35 (identity), p. 216 (synonymy; localities); Smithsonian Misc. 

 Coll., vol. 61, No. 15, 1913, p. 48 (published reference to specimens in the B. M.; Challenger 

 stations 170, 174, 175); Unstalked crinoids of the Sz'&o^a-Exped., 1918, p. 184 (in key; range; 

 references).— Gislen, Ark. Zool., vol. 19, No. 32, Feb. 20, 1928, p. 8, No. 39 (notes); Vid. Medd. 

 Dansk Nat. Foren. K0benhavn, vol. 93, 1933, p. 482; Kungl. Fysiogr. Sallsk. Handl., new ser., 

 vol. 45, No. 11, 1934, pp 21, 26. 



Diagnostic features. — The cirri are stout with about 20 segments of which all but 

 the basal are subequal, about as long as broad or somewhat broader than long, and 

 are arranged in 10 or 15 columns on the centrodorsal ; the division series and arms are 

 smooth; and the 11-20 arms are 100-145 mm. long. 



Description. — The centrodorsal is hemispherical, rather flattened at the dorsal pole. 

 Carpenter's figure shows the cirri arranged in 3 closely crowded columns of 1 or 2 each 

 in each radial area. 



