NEW ZEALAND MOLLUSCA, 319 
MEW ZEALAND MOLLUSCA OF THE “CHALLEN- 
GER” EXPEDITION. 
————<—<—<—=-  —_ 
BY REV. R. BOOG WATSON, F.L.S., etc. 
Extracted from the Linnean Society’s Journal-Zoology, 1879, etc. 
DENTALIUM DIARRHOX, Watson. P.L.S. xiv., p. 511. 
emnOOauly 10; 1874.) dt. 37° 34.55 10n. 170; 22°) KN. 
from New Zealand. 700 fms., Grey ooze, 4 specimens. 
Animal_—Mantle white, body pale yellow. Captacula many, 
fine, long, and equal, with small ovoid points. Foot and collar 
those of a true Dentalium. 
Shell—White (chalky), but porcellanous beneath the surface ; 
rather straight, with a considerable bend near the apex, of rather 
rapid expansion from a very fine apex. Sculpture-—The whole 
surface is faintly marked with scarcely-impressed longitudinal 
lines of very equal interval (about 0.0055 apart) ; transversely 
it is very faintly scratched all over by very slight lines, which run 
elliptically round the shell. The apex has a very narrow slightly 
ragged fissure, about 0.027 in. long, which lies unsymmetrically 
on the convex curve. L.? B.0.9. 
This differs from D. leptosceles, W., in being more curved and 
more conical. It resembles in form the young of D. lubricatum, 
G. B. Sow., B.M., “from Australia”; but in that the transverse 
strize are much less oblique, and the surface is lubricate and po- 
lished. 
CADULUS COLUBRIDENS, Watson, l.c. xiv., p. 523. 
Brag. July 10, 1874. Lat. 37° 34. S.; long. 179° 22).E. 
N.E. point of New Zealand. 700 fms., Grey ooze, I specimen. 
Shell—Like an adder’s fang ; long, sharp, bent, very slightly 
flattened, swollen near the broader end. The swell, which is 
faintly angulated and is at one-fourth of the length, is chiefly on 
the convex curve, but is visible on the concave curve too. From 
the angulation the curve is very equable in either direction. About 
two-thirds a long towards the apex, it bends more back. The shell 
is thin, brilliant, semi-opaque, white. Scw/pture.—Very faint and 
fine scratches on the lines of growth. Mouth large, oval, very 
slightly flattened on the front side, from which the thin sharp 
edge is obliquely cut off towards the convex curve. The foste- 
rior opening is much smaller, nearly round, and the edge is thin 
and chipped. L.o0.58; B, at mouth 0.067, at swell 0.1, at apex 
0.033. 
This is twice the size of C. gadus, Montague; but it resembles 
that in the angulation, which, however, is here more marked at 
the summit of the swelling ; its expansion from the smaller end 
