NO. 1608. ] NEW SPECIES OF CRINOIDS—CLARK. 291 
Locality. _ Albatross Station No. 4122; Barber’ S , Point Light (near 
Honolulu) bearing N. 82° E., 2.2 miles distant; 192-852 fathoms; 
coarse coral sand and shelly: 
ans specimen. 
‘ype.—Cat. No. 22682, U.S.N.M. 
ee was a great surprise to find the genus Zenometra 
represented in the Hawaiian Islands, as the two species with which 
I was previously acquainted are only known from the West Indies 
and the Atlantic coast off Florida and southern Georgia; moreover, 
the Hawaiian species differs markedly from the other two in having 
the cirri in three instead of two columns in each radial area of the 
centro-dorsal, thus necessitating a change in the generic diagnosis, 
while the “ wall-sided ” character of the costals and lower brachials 
is much less marked, and the characteristic interradial ridges on the 
centro-dorsal are obsolete. These differences appear at first sight to 
suggest that Zenometra is really much nearer Psathyrometra than 
was previously supposed; but the very characteristic cirri with 
much elongate joints in the proximal part, and very short and spiny 
joints in the distal, the spiny character of the calyx and arm bases, 
and the elongate conical-columnar centro-dorsal are even more 
marked in Z. triserialis than in Z. columnaris and Z. pyramidalis, 
and show that the two genera are perfectly distinct, though their 
differential characters are somewhat different from those originally 
outlined. 
Genus PSATHYROMETRA. 
PSATHYROMETRA CONGESTA, new species. 
Centro-dorsal conical, the tip rounded, 5 mm. broad and 5 mm. 
long, with 20 crowded columns of cirrus sockets, 5 to a column, 4 
columns to each radial area; the columns in each radial area are not 
separated in any way from those in adjacent areas. Cirri lacking. 
Ends of basal rays prominent, forming an elongate interradial 
tubercle, which at its distal end separates the two topmost cirrus 
sockets of the adjoining radial areas; a deep cleft is present between 
the proximal end of the centro-dorsal and the dorsal surface of the 
radials, bridged over interradially by the ends of the basal rays; ra- 
dials visible as a small triangle over the anterior end of the tubercle 
representing the extremity of the basal ray; first costal short, nar- 
rowing anteriorly, deeply incised in the median line by a strong 
median backward prolongation of the costal axillary; the first costals 
are rounded and very widely separated; costal axillaries rhombic, 
longer than broad, the anterior angle approximately a right angle, 
the posterior angle acute, the two posterior sides somewhat strongly 
concave; a fairly sharp high median keel occupies the posterior two- 
thirds of the joint. Ten arms; first brachial short, longer outwardly 
