2. Ba/anoiiic/ra balaiioidcs (1*. II. Carpenter). 
P. H. Carpentkk. "Cliallcngci" Reports. Comatulae, iS88, p. 207, pi. 33, figs. 6, 7 {Antedon 
balanoidcs). 
A. H. Clark. .Smithsonian Miscellaneous Collections vol. 61, 1913, N" 15, p. 57 [Balanometra 
baUinoides). 
Adelometra A, II. Clark. 
Key to the Species of the Genus Adelometra. 
a' Centrodorsal cokimnar: cirri XX\' — XL, 60 — 70, 25 mm. lonj^; longest cirrus 
segments less than twice as long as broad, with very slightly expanded distal 
ends; 14 arms: IIBr series usually 4(3 + 4) (Kei Islands; 252 Metres) angustiradia 
a- Centrodorsal rounded conical, about half again as long as broad at the base; 
cirri about XXX, 30 — 35, from 13 mm. to 18 mm. long; longest cirrus 
segments (fourth-tenth) about three times as long as the distal diameter, with 
expanded and funnel-shaped distal ends; 10 arms (off Havana, Cuba; 
380 Metres) temiipes 
1. Adeloiiiefra angustiradia (P. H. Carpenter). 
P. H. Carpenter. "Challenger" Reports. Comatulae, 1888, p. 253, pi. 45, fig. 4 [Antedon 
angustiradia). 
. A. H. Cl.\RK. Smithsonian Miscellaneous Collections, vol. 61, 191 3, N" 15, p. 57 [Adelometra 
angustiradia). 
2. Adelometra tejuiipes A. H. Clark. 
A. H. Cl.\RK. Froc. U. S. National Museum, vol. 7,6, 1908, p. 236 [Adelometra tenuipes). 
4''' Subfamily Perometrinae A. H. Clark. 
Key to the Genera of the Subfamily Perometrinae. 
a' P| and P„ absent; size small, the 10 arms being from 25 mm. to 35 mm. 
(usually between 25 mm. and 30 mm.) in length; cirri XX — XXX, 22 — 25, 
10 mm. long (West Indies; 59 — 433 Metres) Hypalometra 
a- Pj always present, though P,, (on the inner di.stal end of the first .syzygial 
pair) is sometimes absent 
b' ossicles of the IBr series and first two brachials with smooth and unmodified 
depressed borders, laterally in close apposition with their neighbors and 
sharply flattened against them ; synarthrial tubercles (on the articulations 
between the elements of the IBr series and first two brachials) very 
prominent, sometimes extravagantly developed ; 1\ is as long as, longer 
than, or shorter than, !'„; P^ may be absent; 10 — 14 (usually 10) arms 
SlBOGA-EXrEDITIE XI.IW\ 3° 
