352 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



synonymy and range were given. In 1913 I noted that I had examined five of Car- 

 penter's original specimens from Challenger station 170A at the British Museum and 

 that it had been well figured by Carpenter. In my memoir on the unstalked crinoids 

 of the Siboga Expedition published in 1918 basicurva was included in the key to the 

 species of Charitometra and the synonymy and range given. Prof Torsten Gislen in 1928 

 published notes on the specimens which he had examined in the British Museum. 



CHARITOMETRA INCISA (P. H. Carpenter) 



[See vol. 1, pt. 1, figs. 278, p. 260, 494, p. 367; pt. 2, pi. 3, figs. 992, 993.] 



Antedon incisa von Graff, Challenger Report, Zoology, vol. 10, pt. 27, 1884, pp. 18, 31, 70 (my- 

 zostomes; Challenger stations 170, 174; nomen nudum); Narrative, vol. 1, pt. 1, 1885, p. 316 

 (myzostomes) ; Zoology, vol. 20, pt. 61, 1887, p. 2 (myzostomes; Challenger station 170). — 

 P. H. Carpentf.r, Challenger Reports, Zoology, vol. 26, pt. 60, 1888, p. 124 (description; Challenger 

 stations 170A, 174, B, C, or D), pi. 2, figs. 1, a-d; pi. 21, (figs. 1, 2).— Braun, Centralbl. Bakteriol. 

 und Parasitenkunde, vol. 3, 1888, p. 185 (myzostomes; after von Graff). — Hartlaub, Bull. Mus. 

 Comp. Zool., vol. 27, No. 4, 1895, p. 131 (systematic and bathymetrical relationships). — Lang, 

 A text book of comparative anatomy, vol. 2, 1896, p. 312, fig. 258. — Button, Index faunae 

 Novae Zealandiae, 1901, p. 290 (listed).— A. H. Clark, Proc. U. S. Nat. Mus., vol. 33, 1907, p. 140 

 (comparison with A. [Strotomelral] hepburniana) . — Hamann, Bronn's Klassen und Ordungen des 

 Tier-Reichs, vol. 2, Abt. 3, 1907, p. 1578 (listed).— A. H. Clark, Crinoids of the Indian Ocean, 

 1912, p. 33 (identity). 



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

 Biol. Soc. Washington, vol. 22, 1909, p. 20 (listed); Crinoids of the Indian Ocean, 1912, p. 33 

 (identity), p. 227 (synonymy; locality); Smithsonian Misc. Coll., vol. 61, No. 15, 1913, p. 49 

 (published reference to specimens in the B. M. ; Challenger stations 170A, 174) ; Unstalked crinoids 

 of the Siboga-Exped., 1918, p. 191 (in key; range).— Gislen, Ark. Zool., vol. 19, No. 32, Feb. 20, 

 1928, p. 9, No. 43 (notes). 



Diagnostic features. — The lower brachials are smooth with unmodified distal ends; 

 the 10 (rarely 11) arms are about 90 mm. long. This is possibly only a smooth-armed 

 variety of Ch. basicurva. 



Description. — The centrodorsal is hemispherical with a rough dorsal pole and small 

 interradial processes. According to the figures the cirrus sockets are arranged in a single 

 irregular marginal row. 



The cirri are about XV, 15-18; the segments are rather stout, most of them longer 

 than broad, the longest according to the figure not quite twice as long as broad. In 

 the younger cirri the later segments overlap very slightly on the dorsal side so as to 

 produce faint spines; this is lost in the older cirri except in the penultimate, which bears 

 a strong opposing spine. 



The radials are short and bandlike with curved borders and are in apposition above 

 the interradial processes of the centrodorsal. The IBri are somewhat longer and are in 

 close lateral contact and rather convex in the center where they are but little incised for 

 their junction with the IBr 2 (axillary) which is also sharply convex, short, and pentag- 

 onal, with very open angles. The axillaries and first four or five brachials have the 

 marginal portions of their dorsal surface flattened vertically, with sharp edges and wall- 

 like sides. 



The 10 arms are about 90 mm. long. The first brachials are almost oblong and very 

 convex in the center. The second are shorter and more wedge-shaped. The brachials 

 following are smooth and rather short until about the tenth, then longer and obliquely 



