244 
Florometra magella7iica seems to be a distinct form, confined to southern South America. 
Floronietra laodice may be the same as F. aspcrriiiia, though occurring on the opposite 
shore of the Pacific. 
Some specimens from the Gulf of Alaska seem to be referable to Floronietra mariae 
rather than to F. serratissima\ and it is possible that the latter, which is probably only a 
spinous form of F. perplexa anyway, will eventually prove to be a synonym of mariae. 
Floronietra tantteri, though it appears to be distinct, ma\- be the young of F. perplexa., 
or of F. serratissima , or of both forms. 
Cyclometra A. H. Clark. 
Key to the Species of the Genus Cyclometra. 
a^ Larger; cirri XXVII, 41 — 43, 30 mm. long; arms 130 mm. long: Pj 17 mm. 
to 19 mm. long, with 42 — 45 segments (northwest of Socotra, in i4°2o'N., 
52° 30' E.; 2160 Metres) flavescens 
a- Smaller; cirri 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. H. Clark. Proc. Biol. Soc. Washington, vol. 24, 191 1, p. 87 [Cyclometra flavescens). 
Crinoids of the Indian Ocean, 1912, p. 239 [Cyclometra flavescens). 
2. Cyclometra clio (A. H. Clark). 
A. H. Clark. Proc. U. S. National Museum, vol. 33, 1907, p. 79 [Antedon clio). 
7"' Subfamily B a t hy m e tr i n a e A. H. Clark. 
Key to the Genera of the Subfamily Bathymetrinae. 
a^ All the cirrus segments short, the longest not so much as twice as long 
as the median diameter 
b' cirrus segments cylindrical, without expanded distal ends, 25 — 33 
(usually nearer the latter) in number, the longest (third-fifth) about 
one third again as long as broad, those beyond the eighth about as 
long as broad, the distal slightly broader than long; IBr series and 
arm bases without lateral processes, and widely free laterally (western 
coast of Ireland; 698 Metres) "Orthonaetra 
b- cirrus segments with much swollen distal ends, not more than 20 in 
number: IBr series and brachials in close lateral contact (Moluccas 
to Marion Island, southeast of Africa; 1089 — 2880 Metres) Tonrometra 
a" Pro.ximal cirrus segments elongated, at least twice as long as the median 
diameter, and usually much longer 
