99 



b 1 the first four pairs of pinnules very stiff, and spine-like ; 50 (5 l) arms-i 15 mm. 

 long; the extra axillaries are external, so that the arms are arranged in 

 3, 2, 2, 3 order; the cirri are XXX— XXXV, 50 — óo, 40 mm. long 



(Philippinelslands) erinacea 



b" the proximal pinnules, though stiffened, are not spine-like, ending in a 

 delicate, more or less flagellate tip ; 40 arms 



c 1 first four or five pairs of pinnules stiffened and elongated ; P T about 

 as long as P s , which is markedly longer than P g ; 60 — 80 cirrus 

 segments of which those in the outer half of the cirri bear small 



dorsal spines (Philippines and New Britain) finsckü 1 ) 



c 2 first six or seven pairs of pinnules stiffened and elongated; P t markedly 

 shorter than P 2 and P. ; , which are of the same length and character; 

 47 — 66 cirrus segments, of which the outer three fourths bear prominent 

 dorsal spines (Andaman Islands to the Philippines). . . arauea,-) 



1. Oxymetra tenuicirra (A. H. Clark). 



A. H. Clark. Arm. and Mag. Nat. Hist., series 8, vol. 10, 191 2, p. 32 [Selenemetra tenuicirra). 



Smithsonian Miscellaneous Collections, vol. 6o, 1912, N" 10, p. 22, in text [Selenemetra 



tenuicirra). 



Stat. 320. 6°5'S., U4°7'E. 82 Metres. 1 Ex. 



This species is very closely related to O. fiuschii from which it differs chiefly in having 

 more slender cirri with much longer distal segments, which are nearly or quite as long as 

 broad instead of twice as broad as long or even broader as in O. fiuschii, and also longer 

 proximal segments the longest of which are about twice as long as broad instead of only 

 slightly, if at all, longer than broad. 



The single specimen has 49 arms 150 mm. long; each IIBr series bears two IIIBr series, 

 of which the inner bears an internal IVBr series, so that there are 10 arms to each ray arranged 

 in 2, 3, 3, 2 order. 



The cirri are XXXV, 69 — 78, 55 mm. to 70 mm long, much more slender than those 

 of O. fiuschii. 



Pj is 11 mm. long with 20 — 21 segments which become about as long as broad on 

 the fifth or sixth and twice as long as broad distally ; P s is 12 mm. long with 22 segments, 

 resembling P r P 3 is 10 mm. long with iS segments. P t is 7.5 mm. long with 13 segments; 

 the distal taper is more marked than in P 3 . P. is 7 mm. long with 13 segments, slightly more 

 slender than P p especially in the distal portion. The distal pinnules are 8 mm. long with 

 1 7 segments. 



1) Synonym Hitnerometra gracilipes A. H. * Hark. 



2) Synonym Selenemetra viridis A. H. Clark. 



