390 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



Carpenter in 1888 from four specimens dredged by the Challenger at station 192. It 

 was transferred to the new genus Calometra upon its establishment in 1907. In 1911 I 

 recorded and gave notes upon a specimen of Calometra discoidea from Albatross station 

 5577, and in 1912 I compared its cirri with those of a new species, Calometra (Neometra) 

 diana. In my memoir on the crinoids of the Indian Ocean published later in 1912 I 

 gave the synonymy and range of Calometra discoidea, and in a paper on the crinoids 

 of the British Museum published in 1913 I gave some notes on Carpenter's type 

 material. 



Prof. Torsten Gisl6n in 1924 discussed the synarthrial tubercles of this species, 

 and in 1929 I recorded a broken specimen that had been found on a cable brought up 

 from a depth of 100 fathoms in Rotti Strait by the cable repair ship The Cable and 

 presented to the British Museum by the Eastern and Associated Telegraph Co. 



CALOMETRA CALLISTA (A. H. Clark) 



PLATE 36, FIGURE 193 



[See also vol. 1, pt. 1, figs. 357, 358 (cirri), p. 293; pt. 2, fig. 201 (lateral view), p. 133; figs. 320 (proxi- 

 mal pinnules), 334 (middle pinnules), p. 227; fig. 737 (disk), p. 349.] 



Antedon callista A. H. CLARK, Proc. U. S. Nat. Mus., vol. 33, 1907, p. 132 (color) ; p. 135 (description; 

 Albatross station 4903). 



Antedon separata A. H. CLARK, Proc. U. S. Nat. Mus., vol. 33, 1907, p. 133 (description; Albatross 

 station 4893). 



Calometra callista A. H. CLARK, Smithsonian Misc. Coll., vol. 50, pt. 3, 1907, p. 363 (listed); Proc. 

 U. S. Nat. Mus., vol. 34, 1908, p. 318 (Japan); Crinoids of the Indian Ocean, 1912, p. 179 (syn- 

 onymy; range) ; Journ. Washington Acad. Sci., vol. 5, No. 6, 1915, p. 215 (range and its signifi- 

 cance). GISLEN, Nova Acta Reg. Soc. Sci. Upsaliensis, ser. 4, vol. 5, No. 6, 1922, p. 96 

 (characters of the lower pinnules). 



Calometra separata A. H. CLARK, Smithsonian Misc. Coll., vol. 50, pt. 3, 1907, p. 363 (listed); Proc. 

 U. S. Nat. Mus., vol. 34, 1908, p. 313 (Sagami Bay); Journ. Washington Acad. Sci., vol. 5, No. 

 6, 1915, p. 215 (range and its significance). 



Pectinometra separata A. H. CLARK, Crinoids of the Indian Ocean, 1912, p. 188 (synonymy; range). 



Diagnostic features. This species is smaller than C. discoidea, the arms being 

 from 55 mm. to 70 mm. in length; the edges of the ossicles of the division series and the 

 distal ends of the brachials are little if at all everted so that the animal appears smooth; 

 there are not over 40 cirrus segments. 



Description. The centrodorsal is very thick discoidal with slightly converging 

 sides and a broad slightly concave polar area. The cirrus sockets are arranged in two 

 and a partial third closely crowded and irregular rows. 



The cirri are about XXX, 40, 23 mm. long. The first segment is short, the second 

 is longer, the third is about as long as broad, the fourth is about half again as long as 

 broad, and the fifth is about twice as long as broad. The segments immediately follow- 

 ing are similar to the fifth. After the twentieth the segments become shorter, so that 

 the twenty-fifth and following are about as long as broad. After the fourth or fifth 

 the dorsal portion of the distal edge begins to project slightly, this gradually becoming 

 more prominent so that the distal portion of the cirri is strongly serrate in lateral view. 

 The opposing spine is terminally situated, triangular, arising from the entire dorsal 

 surface of the segment, and reaching about half its width in height. The terminal 

 claw is about as long as the penultimate segment, rather stout and moderately curved. 



The ends of the basal rays are visible as small tubercles in the angles of the calyx. 



