428 
The radials are entirely concealed; the IBr, are short, about four 
times as broad as the lateral length, slightly convex proximally, distally 
incised by a rounded process from the axillary so that in the median line 
they are about two thirds of the lateral length; the proximal border bears 
very numerous fine short spines; the distal border is similarly modified, 
but the spines become more or less obsolete in the median third; the 
lateral borders are similarly modified, but the spines extend further 
inward over the dorsal surface of the ossicle and are more developed; 
the lateral thirds of the dorsal surface are rather thickly covered with 
fine short spines; the axillaries are rhombic, somewhat over twice as 
broad as long, the lateral angles truncated, forming lateral edges which 
are about one third as long as the lateral edges of the IBr, ; the proxi- 
mal border is modified like the,distal border of the IBr,; the distal 
borders are very finely spinous; the lateral fourths of the dorsal surface 
are rather thickly covered with fine short spines resembling those cover- 
ing the lateral thirds of the IBr;; the synarthrial tubercles are low and 
but slightly marked; the division series are only slightly convex dorsally; 
they are in very close lateral apposition and are sharply flattened; the 
ITBr series are 2, both of the component ossicles resembling the corre- 
sponding ossicles of the [Br series, but the proximal and distal borders 
are more finely spinous and the spinous modification of the dorsal 
surface is proportionately not so broad-exteriorly and is very narrow 
interiorly. 
The twenty arms are from 95 mm to 100 mm long, resembling 
those of C. komachi; the dorsolateral spinous ornamentation runs up in 
a very narrow and progressively narrowing band to the third or fourth 
brachial both externally and internally. 
»Siboga« Station No. 253. 
Type Locality. 
Stenometra acuta sp. nov. 
This species is most closely related to S. hana of Japan, but it is 
at once distinguishable from that form by the much shorter cirri which 
have fewer segments; the carination of the proximal brachials is some- 
what sharper and more prominent than in S. hana. | 
The type has the cirri XII, 51—58, 25 mm long; the first three 
segments (sometimes also the fourth) bear dorsally a fine median cari- 
nation ending distally in a small spine as in S. hana. 
The twelve arms are about 60 mm long. 
Type Locality. — »Siboga« Station No. 294. 
