236 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. XXXIy. 
It gives me pleasure to be able to associate with this species the 
name of the foremost worker on the unstalked crinoids, the late Dr. 
P. Herbert Carpenter. 
ADELOMETRA TENUIPES. new species. 
Ten arms; centro-dorsal conical, about once and one-half as long 
as broad, the sides rather shehtly convex, bearing 10 columns of cirrus 
sockets, close together, the sockets of one column alternating with the 
sockets of those adjacent; the columns are definitely marked, each 
consisting of about 4 sockets. 
Cirri about 30, 13 mm. to 18 mm. long, with 30 to 35 joints; first 
joint short; second about as long as wide, third joint twice as long as 
its distal diameter; fourth to tenth joints about three times as long as 
the distal diameter, then gradually diminishing in length, the six- 
teenth and seventeenth and remaining joints being about as long as 
wide; the elongate proximal joints have expanded and funnel-shaped 
distal ends, dorsally somewhat produced anteriorly, sometimes form- 
ing a small spine, this feature becoming less marked as the joints be- 
come shorter; the fourteenth joint bears distally a sharp dorsal spine, 
which on the following joints progressively occupies more and more 
of the dorsal surface, after 4 or 5 joimts arising from the entire dorsal 
surface; as the dorsal spines increase in extent, the ventral overlap 
decreases, so that ventrally the terminal joints are perfectly smooth; 
the opposing spine is an equilateral triangle not quite so high as the 
width of the penultimate joint, the apex situated shghtly beyond the 
center of the dorsal surface; terminal claw about the length of the 
penultimate joint, stout, and moderately curved. 
Except in the characters of the centro-dorsal and cirri, as detailed 
above, this species closely resembles A. angustiradia, discovered by 
the Challenger in the Ki Islands, and described from a specimen in 
practically the same condition as the type of A. tenuipes. 
Type.—Cat. No. 22677, U.S.N.M.; from Albatross Station No. 
2348; off Habana, Cuba; 211 fathoms. 
PSATHYROMETRA BOREALIS, new species. 
-Centro-dorsal long-conical, 6 mm. long by 5 mm. broad, separated 
into five radial areas by interradial lines which are as wide as, or 
shehtly wider than, the columns of cirrus sockets, and are continued 
to the tip of the centro-dorsal; cirrus sockets in 3 columns in each 
radial area, 7 to 9 to a column, separated from each other by narrow 
lines. In general form and build this is the most slender and delicate 
species of the genus. 3 
Type—Cat. No. 22670, U.S.N.M.; from Aldatross Station No. 
4780: east of Agattu Island, Aleutians; 1,046 fathoms. 
