A MONOGRAPH OF THE EXISTING CRINOIDS 295 



lasterinae. He remarked that he had "not seen more than half a dozen other indi- 

 vidual representatives of the group in addition to the three already mentioned" 

 {echinoptera [meridionalis], pulchella [which he also referred to the Stelligera group], 

 and rubiginosa). One of this half dozen is Leptonemaster venustus, and some, at least, 

 belong to the genus Comissia; another is the type specimen of Miiller's Comatula 

 cumingii. The last is a synonym of Comatula pectinata, while the genera Leptone- 

 master and Comissia belong to the Capillasterinae. 



KEY TO THE QENERA OF THE SDBFiMILT COMACTINIINAE 



a'. More than 30 cirrus segments which, except the penultimate, are twice as broad as long or even 

 broader (southern Australia, from Perth, Western Australia, to Port Phillip, Victoria; 0-18 



meters) Comatulella, p. 295. 



a'. Fewer than 25 cirrus segments, of which at least some, and commonly all, are longer than broad; 



cirri occasionally absent. 



b'. Elements of the I Br series short and broad and, usually with the first 2 brachials, in lateral 



apposition; segments of the genital pinnules short and broad, usually much broader than 



long in the basal half of the pinnule, and more or less produced distally; only exceptionally 



more than XX cirri, which are short and rather stout; cirri sometimes absent. 



c'. Elements of the I Br series and first 2 brachials united by a more or less perfect syzygy, or at 



least the union is extremely close and shows externally no evidence of a median articular 



ridge; 2 or more of the basal segments of the proximal pinnules usually bear a prominent 



carinate process; arms 10-20, though usually 10; cirri may be absent (Ceylon and the Gulf 



of Martaban to Australia, south to between Fremantle and Geraldton, Western Australia, 



and Sandon Bluffs, New South Wales, northward to Hong Kong, the Cliina Sea, and Luzon, 



and eastward possibly to the Society Islands; 0-109 meters) Comatula, p. 302. 



c^. Elements of the IBr series and first 2 brachials united by synarthry, the line of union appear- 

 ing externaUy as 2 very narrow triangles converging to a common apex in the median 

 line; no carinate processes on the basal segments of the proximal pinnules; arms never 

 more than 10; cirri always present (Cape Lookout, N. C, southward throughout the 



Caribbean Sea to Rio de Janeiro, Brazil; 0-508 [?510] meters) Comactinia, p. 374. 



6^ Elements of the IBr series longer and narrow, widely free laterally; segments of the genital 

 pinnules beyond the first 2 as long as, or longer than, broad; cirri XXIV-XL, long and 

 slender, strongly compressed laterally; cirri always present; arms never more than 10 in 

 number (southwestern Japan to the Lesser Sunda Islands; 311-984 meters) 



Comatulides, p. 400. 

 Genus COMATULELLA A. H. Clark 



Comatula (part) Lamarck, Hist. nat. des animaux sans vertfebres, vol. 2, 1816, p. 535, and following 

 authors. 



Aledo (part) J. Muller, Monatsber. d. k. preuss. Akad. d. Wiss., 1841, p. 206. 



Actinometra (part) P. H. Carpenter, Trans. Linn. Soc. (Zool.), ser. 2, vdI. 2, 1879, p. 27, and 

 following authors. 



Comatulella A. H. Clark, Amer. Journ. Sci., ser. 4, vol. 32 (aid ser. 182), No. 188, Aug. 1911, p. 130 

 (no diagnosis; used with the specific name brachiolata without explanation); Die Fauna 

 Sudwest-Australiens, vol. 3, Lief. 13, 1911, p. 439 (confined to south Australia; clisely related 

 to Comatula which represents it in the East Indies); p. 447 (used to include [Comatula] brachio- 

 lata only); Crinoids of the Indian Ocean, 1912, p. 9 (confined to south Australia); Journ. 

 Washington Acad. Sci., vol. 5, No. 1, 1915, p. 8 (confined to the Australian fauna; most closely 

 related to Comactinia); Die C.inoiden der Antarktis, 1915, p. 167 (nearly related f) Comatula); 

 American Naturalist, vol. 49, 1915, p. 525 (bathymetrical range); p. 539 (asymmetrical disk); 

 Unstalked Crinoids of the Siboga Exped., 1918, p. 24 (in key; range).— GisLfiN, Zool. Bidrag 

 fr&n Uppsala, vol. 9, 1924, p. 59 (biseriality). 



