2. Balanomctra balanoides (P. H. Carpenter). 



P. H. Carpenter. "Challenger" Reports. Comatulae, 1 888, p. 207, pi. 33, figs. 6, 7 {Antedon 



balanoides). 

 A. H. Clark. Smithsonian Miscellaneous Collections vol. 61, 191 3, N° 15, p. 57 [Balanometra 



balanoides). 



Adelometra A. H. Clark. 

 Key to the Species of the Genus Adelometra. 



a 1 Centrodorsal columnar-. cirri XXV — XL, 60 — 70, 25 min. long; longest cirrus 

 segments less than tvvice as long as broad, with very slightly expanded distal 

 ends; 14 arms; IIBr series usually 4 (3 + 4) (Kei Islands; 252 Metres) angustiradia 



a 3 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) ' teuuipes 



1. Adelometra angustiradia (P. H. Carpenter). 



P. H. Carpenter. "Challenger" Reports. Comatulae, 188S, p. 253, pi. 45, fig. 4 {Antedon 



angustiradia). 

 A. H. Clark. Smithsonian Miscellaneous Collections, vol. 61, 19 1 3, N" 15, p. 57 {Adelometra 



angustiradia). 



2. Adelometra teuuipes A. H. Clark. 



A. H. CLARK. Proc. U.S. National Museum, vol. 36, 1908, p. 236 {Adelometra teuuipes). 



4 th Subfamily Perometrinae A. H. Clark. 

 Key to the Genera of the Subfamily Perometrinae. 



a 1 Pj 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 3 Pj always present, though P„ (on the inner distal end of the first syzygial 



pair) is sometimes absent 



b 1 ossicles of the IBr series and first tvvo 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; P x is as long as, longer 

 than, or shorter than, P 2 ; P, 7 may be absent; 10 — 14 (usually 10) arms 



SIBOGA-EXPEDITIE XLll/'. 30 



