A MONOGRAPH OF THE EXISTING CRINOIDS 263 



One hundred and twenty miles off the Seychelles; 1,462 meters; cable repair 

 ship Lady Denison-Pender, Eastern and Associated Telegraph Co. [A. H. Clark, 1929] 

 (1, B. M.). 



History. This species was first described under the name of Pachylometra 

 macilenta in 1909 from a single specimen dredged among the Laccadive Islands by 

 the Royal Indian Marine Survey steamer Investigator. It was redescribed and figured 

 in my memoir on the crinoids of the Indian Ocean published in 1912. On the establish- 

 ment of the genus Perissometra in 1916 macilenta was transferred to it, and in my 

 memoir on the unstalked crinoids of the Siboga Expedition published in 1918 macilenta 

 was included in the key to the species of Perissometra and the synonymy and range 

 were given. In 1929 I recorded and gave notes on another specimen that had been 

 brought up on a cable south of Timorlaut by the cable repair ship Patrol of the Eastern 

 and Associated Telegraph Company. In the same paper I described and figured 

 under the name Perissometra occidentalis, sp. nov., a specimen from 120 miles off 

 the Seychelles found on a cable by the cable repair ship Lady Denison-Pender of the 

 same company. 



In 1934 Prof. Torsten Gislen selected Perissometra macilenta as representing a 

 special type of crinoid arm division including also Pachylometra distincta and P. 

 inaequalis. 



GLYPTOMETRA ANGUSTICALYX (P. H. Carpenter) 



[See vol. 1, pt. 1, figs. 275, p. 260, 490, p. 367; pt. 2, pi. 3, figs. 984, 985, pi. 14, fig. 1055, pi. 26, fig. 



1159, pi. 42, figs. 1270-1272.] 



Antedon, sp. P. H. CARPENTER, Pop. Sci. Rev., vol. 4, No. 15, 1880, p. 194, pi. 6, fig. 12 (plated disk). 



Antedon angusticalyx VON GRAFF, Challenger Reports, Zool., vol. 10, pt. 27, 1884, pp. 17, 70 (Challenger 

 sta. 214; myzostomes; nomen nudum). P. H. CARPENTER, Challenger Reports, Zool., vol. 11, pt. 

 32, 1884, pp. 57, 83, 84, 93, 109, 110, 113, 128, 135, pi. 54, fig. 5, pi. 55, fig. 6. VON GRAFF, Chal- 

 lenger Reports, Narrative, vol. 1, pt. 1, 1885, p. 316 (myzostomes). P. H. CARPENTER, Chal- 

 lenger Reports, Zoology, vol. 26, pt. 60, 1888, p. 242 (description; Challenger station 214), pi. 2, 

 figs. 4, a-d, pi. 50, figs. 1, 2, text fig. 5, B, p. 246. SPRINGER, Mem. Mus. Comp. Zool., vol. 25, 

 No. 1, 1901, p. 45 (tegmen compared with that of Holocrinus). MINCKERT, Arch. Naturg., 

 Jahrg. 71, 1905, vol. 1, Heft 1, p. 224 (syzygies; 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). 



Charitomelra angusticalyx A. H. CLARK, Smithsonian Misc. Coll., vol. 50, pt. 3, 1907, p. 361 (listed); 

 Smithsonian Misc. Coll., vol. 52, pt. 2, 1908, p. 227 (compared with Ch. smithi). 



Pachylometra angusticalyx A. H. CLARK, Proc. Biol. Soc. Washington, vol. 22, 1909, p. 21 (listed); 

 Proc. U. S. Nat. Mus., vol. 36, 1909, p. 407 (compared with P. levigata); vol. 37, 1909, p. 34 (same 

 constriction of proximal portion occurs in Ptilometra splendida) ; Crinoids of the Indian Ocean, 

 1912, p. 35 (identity), p. 216 (synonymy; locality); Smithsonian Misc. Coll., vol. 61, No. 15, 1913, 

 p. 47 (published reference to specimens in the B. M.; Challenger station 214).- GISLEN, Zool. 

 Bidrag Uppsala, vol. 9, 1924, p. 280; Kungl. Fysiogr. Sallsk. Handl., new ser., vol. 45, No. 11, 

 1934, pp. 21, 22. 



Perissometra angusticalyx A. H. CLARK, Journ. Washington Acad. Sci., vol. 6, No. 17, 1916, p. 607 

 (listed) ; Unstalked crinoids of the Siboga-Exped., 1918, p. 176 (in key; range), p. 178 (references). 

 GISLEN, Ark. Zool., vol. 19, No. 32, Feb. 20, 1928, No. 35 (notes). 



Diagnostic features. The proximal portion of the animal is constricted, the sides 

 of the IBr series being parallel or nearly so, the IIBr series somewhat abruptly turned 

 outward; the cirri have 18-23 segments of which all but the basal are longer than 



