270 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



Localities. — Alert; Marie Louise Island, Amirante group; 31 meters [Bell, 1884; 

 A. H. Clark, 1911, 1912, 1913, 1918] (9, B. M.). 



Alert; Isle des Neufs, Amirante group; 31 meters; coral [Bell, 1884; A. H. Clark, 

 1911, 1912, 1913, 1918] (1, B. M.)- 



Seychelles; Professor Brauer [A. H. Clark, 1911, 1912] (1, Berl. M.). 



History. — The specimens from the Amirante Islands collected by the Alert were 

 recorded by Prof. F. Jeffrey Bell in 1884 simply as Actinometra, sp. 



In 1910 I found these determined as Actinometra pectinata, and in 191 1 1 described 

 them as a new species under the name of Comissia ignota, basing the description on the 

 material from Marie Louise Island. 



In an account of the crinoids of Africa published in 1911 I mentioned some 

 "immature comasterids from the Seychelles" which I tentatively regaded as Coman- 

 thus parvicirra. In 1912, however, they were redetermined as Comissia ignota. 



COMISSIA MINUTA Gisl£n 



Comissia ignota var. minula Gisl:6n, Nova Acta reg. Soc. sci. Upsaliensis, ser. 4, vol. 5, No. 6, 1922, 



p. 4 (127-209 m.). 

 Comissia ignota minuta Gisl^n, Nova Acta reg. Soc. sci. Upsaliensis, ser. 4, vol. 5, No. 6, 1922, p. 6 



(Bonin Is.); p. 25 (Bocli's stations 42, 45, 45A, 47, 55, 61; description); figs. 18-20, p. 28; 



pi. 1, fig. 3. 



Diagnostic Jeatures. — The cirri are usually XV-XVI, 9-10, not more than 4 mm. 

 long; the longest cirrus segment is about three times as long as broad. The arms are 

 not more than 30 mm. in length. 



Characters.— The cirri are XII-XX (usually XV-XVI), 8-12 (usually 9-10). 



Gisl6n remarks that the individuals seem to be mature at an arm length of from 

 25 to 30 mm., as in such individuals the pinnules are strongly swollen; but even in 

 individuals with shorter arms the gonads are quite visible. 



All individuals with complete pinnidation have combs on Pi and P2, but none 

 on P3. The number of teeth in the comb varies from 7 to 10, and is usually 8. 



Notes. — In a specimen from Bock's station 45 the centrodorsal is 1.5 mm. in 

 diameter, the bare dorsal pole being 1 mm. across. 



The cirri are XV, 10, 3.5 mm. long. The second segment is half again as long as 

 the distal width and is centrally constricted. The third segment is three times as 

 long as broad, the fourth is twice as long as broad, the fifth is three-quarters again 

 as long as broad, and the sixth and seventh are one-third again as long as broad. 

 The antepenultimate is as long as or somewhat longer than broad. The last 3 or 4 

 segments bear each a small dorsal spine. The terminal claw is somewhat longer 

 than the penultimate segment and is strongly curved. 



The radials are visible as small triangles in the interradial angles. The IBri 

 are six times as broad as long, with their lateral edges free and making with those of 

 their neighbors an angle of 45°. The IBr2 (axillaries) are triangular, twice as broad as 

 long, with very concave distal sides. The 2 elements of the IBr series are united by 

 syzygy. 



The 10 arms are about 20 mm. in length. The first 2 brachials are rather 

 narrow, four times as broad as long, and twice as long exteriorly as interiorly. The 

 longer side of the distal brachials is twice their width. There are 20 brachials for 



