173 
Pectinura cylindrica. H. L. Clark. 1909. Notes on some Australian and 
Indo-Pacific Echinoderms. Buli. Mus. Comp. Zool. 
LIl. p. 117. 
- — H. L. Clark. 1915. Catalogue of Recent Ophiur- 
ans. Mern. Mus. Comp. Zool. XXV. p. 303. 
Some few specimens of this species were taken at Mahia Pen- 
insula, under stones at low water (18 XII. 14). Further, a single, 
very 'young specimen was taken at the Three Kings Isl., in a depth 
of 65 fathoms, 5/1.15, and must undoubtedly belong to this spec¬ 
ies. — Some remarks on the characters which distinguish this 
species from Pectinura gracilis are given under the latter species. 
40. Pectinura gracilis n. sp. 
Kigs. 3.5.3—s; Fig. 30. 
Paterson Inlet, Stewart Isl., 5 — 15 fms; mud bottom; 17/IX.14. A few 
specimens. 
Queen Charlotte Sound, 3—10 fms. 20 1 15. 2 specimens. 
Three Kings Isl., ca. 65 fms. 5/1.15. 1 specimen. 
Diameter of disk of largest specimen 8 mm; arms 3 times the 
diameter of disk, siender and very flexible. Disk, as usually in this 
genus, completely covered with fine grains. Mouth papillæ as in 
P. cylindrica, but the oral shields distinctly smaller than in that 
species (Figs. 35.i, 3.). Supplementary plate generally distinet, semi- 
circular. Ventral plates about as long as broad, sometimes with a 
small keel in the proximal part. No grooves between the inner 
ventral plates. Two tentacular scales of the typical shape and ar¬ 
rangement. Dorsal plates fanshaped, only slightly broader than long, 
the inner one, following the one or two rudimentary plates within 
the notch at the armbasis, almost semilunar. Armspines 6, rarely 
7 (on a few of the proximal armjoints); they are rather siender, 
about half the length of the side plate. — Colour of disk and 
arms almost black, the arms somewhat banded with white. 
In some of the larger specimens a few of the dorsal plates in 
the proximal part of the arm have a somewhat different shape, the 
outer corners being somewhat rounded truncate. This character I 
find more pronounced in the two specimens from Queen Charlotte 
Sound (Fig. 35.5). These specimens otherwise agree so completely 
