244 



metra magellan ns to 1"- a distinct form, confined to southern South America. 



F lor ometra laodice may be the same as F. asperrima, though occurring on the opposite 

 shorr of the Pacific. 



ime specimens from the Gulf ol AJaska seem to be referable to Florometra ma; 

 rather than t<> F. serrati and it is possible that the latter, which is probably only a 



spinous form of F. perplexa anyway, wil! eventually prove t<> be a synonym of mariae. 



Florometra tannert, though it appears to be. distinct, may be the young of F. perplexa, 

 or of F. terrat or ol both forms. 



Cyclometra A. II. Clark. 



Key tn the Species of the Genus Cyclometra. 



a l Larger; cirri XXVII, 41 43, 30 mm. long; arms [30 mm. long; P, 17 mm. 

 tu in mm. long, with 42 45 segments (northwest of Socotra, in i4°2o' X.. 



E. ; 2160 Metres) flavescens 



i-irri XL — L, 25 — 30, 17 mm. long; arms 55 mm. long; P, 10 mm. 

 long, with about 30 segments (southwestern Japan; 192 Metres) . . . clio 



1. Cyclometra flavescens A. H. Clark. 



A. II. CLARK. Proc. Hiol. Soc. Washington, vol. 24, 1911, p. &j [Cyclometra flavescens). 

 Crinoids of the Indian Ocean, 1912, p. 239 [Cyclometra flavescens). 



2. Cyclometra clio (A. H. Clark). 



A. II. CLARK. Proc. U.S. National Museum, vol. 33, 1907, p. 79 [Antedon clio). 



Subfamily B a thy m e tr inae A. H. Clark. 



Key to the Genera of the Subfamily Dathymctrinae. 



a' All the rirrus segments short, the longest not so much as twice as long 

 the median diameter 

 b 1 cirrus segments cylindrical, without expanded distal ends, 25 — 33 

 >ually nearer the latter) in number, the longest (third-fifth) about 

 one third again as Ion- as broad, those beyond the eighth about as 

 long as broad, the distal slightly broader than long; [Br series and 

 arm bases without lateral pro . and widely free laterally (western 



ist of I rel and: 69J M< tres Orthometra 



cirrus segments with much swollen distal ends, not more than 20 in 

 number; 1 1 ir series and brachials in close lateral contact (Moluccas 

 t<> Marion Island, southeast of Africa; to8g 2880 Metres) Tonrometra 

 a Proximal cirr ■ ments elongated, at least twice as Ion- as the median 

 meter, and usuallv much lon-er 



