no. 1808. RECENT AFRICAN CRINOWS— CLARK. 31 



13 mm. long, slender (though stouter than PJ, especially distally, 

 with twenty or twenty-one segments, the first not quite so long as 

 broad, the second slightly longer than broad, the following increasing 

 in length, so that the fourth and following are between two and five 

 times as long as broad; fourth or fifth and following segments with 

 the distal edge and the distal vcntro-lateral border prominently 

 everted and spinous as in the other species of the genus, though the 

 production is not quite so much as usual; the dorsal (outer) portion 

 of the outer edge of the segments is not produced; P 3 7.5 mm. long, 

 as slender as F 1 but stiffened, with fifteen segments resembling those 

 of P 2 ; P 4 6.5 mm. long, with sixteen segments, resembling P 3 , though 

 slightly more slender; P 5 6 mm. long, slightly more slender and less 

 stiffened than P 4 , but with the same number of segments; following 

 pinnules resembling P 5 , soon slowly increasing in length, slenderness, 

 and length of the component segments. 



The color is deep violet, with the cirri a purplish flesh color. 



Locality.— Suez Bay; the type is Cat. No. 27509, U.S.N.M. 



Deptli. — 10 fathoms. 



Genus DECAMETRA A. H. Clark. 

 DECAMETRA MOBIUSI, new species. 



Description. — Centrodorsal small, thin-discoidal; cirrus sockets 

 arranged in a single, somewhat irregular, marginal row. 



Cirri XIV, 14-16, 7 mm. long; first segment short, the following 

 gradually increasing in length to the sixth, which, with the following, 

 is about as long as broad; on the fourth a slight projection of the 

 distal dorsal edge begins to appear; this moves progressively ante- 

 riorly, on the ninth and following becoming a low, short transverse 

 median ridge, appearing as a small spine in lateral view, and on the 

 last two or three segments a small median spine; opposing spine 

 median in position, slender and sharp, much longer than the processes 

 on the preceding segments, in height equal to about half the diameter 

 of the penultimate segment; opposing spine longer than the penul- 

 timate segment, stout and comparatively slightly curved basally, 

 but becoming more slender and more strongly curved in the distal 

 half. 



Radials projecting slightly beyond the centro-dorsal, the distal 

 interradial angles widely separated; IBr t oblong, about two and 

 one-half times as broad as long; IBr 2 (axillary) broadly pentagonal, 

 about twice as broad as long. 



Ten arms 50 mm. long, resembling those of C. studeri. 



P t 4.5 mm. long, slender, evenly tapering, and becoming flagellate 

 distally with about thirteen segments, the first short, the second and 

 third about as long as broad, the following gradually increasing in 

 length, becoming about twice as long as broad distally, but shorter 



