'56 
developed; the lateral thirds of the dorsal surface of the IBrj are rather thickly covered with 
fine short spines. The axillaries are rhombic, somewhat over twice as broad as long, with the 
lateral angles truncate; the lateral sides (formed by the truncation of the lateral angles) are 
onlv about one third as long as the sides of the IBr, ; the proximal borders are modified like 
the corresponding borders of the IBr^; the distal borders are very finely spinous; the lateral 
fourths of the dorsal surface are covered rather thickly with fine short spines like the lateral 
thirds of the IBr,; the synarthrial tubercles are low, and only slightly marked; the division 
series are only slightly convex dorsally, sharply flattened laterally, and in very- close apposition. 
The IIBr series are 2, the component ossicles resembling those of the IBr series, but 
the proximal and distal borders are more finely spinous, and the spinous modification of the 
lateral portion of the dorsal surface is relatively narrower exteriorly, and very narrow interiorly. 
The twenty arms are from 95 mm. to 100 mm. long; the spinous modification of the 
lateral portion of khe dorsal surface of the ossicles of the division series runs up in a very 
narrow and progressively narrowing band both internally and externally as far as the third or 
fourth brachial; the proximal oblong brachials have very .slightly everted edges; as the brachials 
become triangular serrate longitudinal striations appear, first only in the median line, but soon 
over the entire dorsal surface of the ossicles, which have slightly overlapping and spinous 
distal edges. 
The specimen from Stat. 254 is similar; there are 20 arms about 95 mm. long; the 
cirri are 35 mm. to 40 mm. long w'ith 56 — 60 segments. 
Stylometra A. H. Clark. 
The only species in this genus is the following : 
I. Stylometra spinifcra (P. H. Carpenter). 
P. H. C.A.RPENTER. Bull. Mu.s. Comp. Zool., vol. 9, 1881, N" 4, p. 158 [Antedon spinifcra). 
VON Graff. Bull. Mas. Comp. Zool., vol. 11, 18S3, N" 7, p. 129 {Antedon spinifera). 
"Challenger"' Reports. Myzostoma, 1884, pp. 14, 15, 19 {Antedon spinifera). 
P. H. Carpenter. "Challenger" Reports. Comatulae, 1888, p. 379 {Antedon spinifera). 
A. H. Clark. Bull, du Mus. d'hist. nat., Paris, 191 1, N" 4, p. 256 {Stylometra spinifera). 
Smithsonian Miscellaneous Collections, vol.61, 191 3, N" 15, p 43 {Stylometra spinifera). 
Stenometra A. H. Clark. 
Key to the Species of the Genus Stenometra. 
a' Cirri with 80 — 90 segments, about one quarter of the arm length ; crest of 
the carination on the ossicles of the IBr series and the first two brachials 
nearly or quite straight, without pronounced denticulations (Kei Islands; 
252 Metres) quinq^tecostata 
a'- Cirri with about 70 segments 
b' longest cirrus segments only .shghtly longer than broad ; profile of the 
median keel on the elements of the IBr series and first two brachials 
irregular and serrate (southern Japan; 91 — 306 Metres) . . . . diadema 
