NO. 1608.] NEW SPECIES OF CRINOIDS—CLARK. 919 
First pinnule 6 mm. long with 12 or 13 joints, the first squarish, the 
second about twice as long as broad, the third about three times as 
long as broad, and the following becoming rather more elongated ; 
second pinnule 4.5 mm. long, similar to the first and with the same 
number of slightly shorter joints; the third and following pinnules 
are shorter still and slightly stouter, with the distal edges of their 
component joints everted and serrate and bear genital glands; distally 
the pinnules become very slender and increase somewhat in length. 
Qolor (in spirits).—Yellowish brown, the pinnules and cirri white, 
the interambulacal areas of the disk also white. 
Locality —Albatross Station No. 3938; Laysan Island Light bear- 
ing S. 88° 30’ E. 7.8 miles distant; 148-163 fathoms; white sand and 
broken shell. 
One specimen. 
Type.—Cat. No. 22692, U.S.N.M. 
Remarks.—Iridometra crispa agrees with /. serrata in having the 
lower pinnules elongate and the first longer than the second, but it 
differs strikingly in lacking altogether the enormous eversion and 
overlap of the pinnule joints of that species; the cirrus joints, also, 
which in /. serrata are strongly “ dice-box shaped” are practically 
cylindrical or oblong in /. crispa. 
Genus ZENOMETRA. 
ZENOMETRA TRISERIALIS, new species. 
Centro-dorsal elongate-conical, 6 mm. long by 3 mm. broad at the 
base, divided into 5 radial areas by interradial lines, which are not 
raised above the general area of the centro-dorsal; these lines are at 
first rather less in width than the diameter of the cirrus sockets, and 
become obsolete in the distal third of the centro-dorsal, which is 
thickly set with short spines; each radial area contains three crowded 
columns of cirrus sockets, usually five to a column. 
Cirri about 75 in number, slender, 40 mm. to 45 mm. long, valid 60 
joints; first joint short; sound maine longer; third about as long as 
broad; following joints becoming coeexeinvalley longer to about the 
seventh, which is between two and one-half and three times as long as 
broad, then remaining uniform until about the eighteenth or twen- 
tieth, when they gradually decrease in length, becoming squarish 
about the thirty-third, and distally broader than long; the fourth or 
fifth to the eighth or ninth joints have their ends somewhat expanded, 
and the following have the distal dorsal edge rather prominent, 
giving the cirri a serrate dorsal and smooth ventral outline in profile; 
in the terminal portion the cirri become moderately compressed, 
and the dorsal surface of the joints becomes carinate and forms low 
