NEW ZEALAND SHELLS. 357 
Edwards in the “ Eocene Mollusca,” published by the Palzeont. 
Soc., p. 218, xxvi. 8. Compared with that figure, this is much 
stumpier, more scalar, more sharply keeled, and the spiral 
sculpture is very much weaker; but there is a great deal of 
affinity in the general features of the shell. 
PLEUROTOMA (DRILLIA) BULBACEA, Watson, l.c., p. 418. 
Se eop jalysio) 1874.:° Latig7 34 | S.,long;er79? 227K. 
N.E. from New Zealand. 700 fms., grey ooze. Bottom tempera- 
ture, 40°. 
Shell,—Broadish, conical, sharply keeled, with a shortish con- 
tracted base and a short snout, short narrow ribs, and spiral 
threads, a bulbous apex, strong, porcellaneous. Sculptuve—Lon- 
gitudinals—Below the sinus-area and about one-third down the 
whorls from the suture arise, not quite abruptly, ribs slightly 
tubercled at the top, straight, direct, narrow, and parted by shal- 
low furrows about twice their breadth; they become feeble to- 
wards the lower suture ; on the last whorl they do not continue 
to the base, and become broader and weaker towards the mouth. 
There are eleven on the last and penultimate whorls ; on the 
first infra-embryonic whorl there are about seventeen crowded, 
sharp, scarcely curved, and oblique. The lines of growth are 
numerous and unequal; in the sinus-area they are sharp and 
delicate, on the rest of the shell coarse and puckered. Spirals 
—Marginating the suture at the top of each whorl is a narrow 
scarcely swollen band; below this the sinus-area is very finely, 
almost microscopically, scratched ; and the scratch-sculpture is 
continued, though less distinctly, on the rest of the surface. The 
projection of the top of the ribs forms a sharp keel. The rib- 
area is crossed by five coarsish threads, which arise into small 
tubercles on the ribs; one or two smaller threads come in betwen 
the lines of these spirals. The same sort of threads, but less 
distinct, are found on the base; those on the pillar and snout 
are a little more distinct. Colour dull porcellaneous white. 
Epidermis quite gone. Sfive rather short, conical, very slightly 
scalar; cylindrical towards the top. Apex two smooth embry- 
onic whorls, swollen and roundedly pressed down, with a 
deepish suture, rather more prominent than the regular whorl 
which follows. Whorls 6%, short. of rather rapid increase; the 
last large relatively to the rest ; from the suture to the ribbing 
they are concavely shouldered. The projection of the tubercles 
at the top of the ribs forms a carination, which does not really 
exist in the form of the whorls themselves ; there is a very slight 
contraction towards the lower suture. The last whorl contracts 
slightly from the keel to the edge of the base, and from that 
point rapidly to the small, narrow, straight, and direct snout. 
Suture coarse, slightly impressed, and well defined by the band 
below it, Mouth narrowly oval, pointed above, with an oblique, 
short, rather open, and gradually contracted canal in front. 
Outer lip a rather depressed convex curve, a little concave at the 
