Hvrros.—On some Branchiate Gastropoda. 121 
The operculum and the posterior canal show that this species belongs 
to Purpura, and not to Polytropa where it is usually placed. 
PornvrRoPA quoyt, Reeve. Pl. XIII., fig. a. 
Dentition.— Central tooth convex in front and straight behind, with five 
narrow pointed, separated, denticles the external and median subequal, the 
intermediate two much smaller. Operculum ovate, the nucleus sub-apical. 
The specimen figured was sent me from Auckland by Mr. T. F. Cheeseman. 
The columella in this species is rounded and the operculum is muricoid. 
It is evidently not a Polytropa but a Trophon. 
PorvTROPA STRIATA, Martyn. Pl. XIII., fig. n. 
Dentition.— Central tooth arched with a convex sinuation in the middle 
of the anterior margin. Cusps five, the median one isolated from the others 
and sometimes much longer. Operculum ovate, the nucleus sub-lateral. 
The specimen figured was collected at Lyttelton. 
Ponyrropa scopina, Quoy and Gaimard. Pl. XIII., fig. s. 
Dentition resembles that of P. haustrum. Operculum oblong, the nucleus 
sub-lateral. 
The specimen figured was collected at Auckland. 
POLYTROPA ALBOMARGINATA, Deshayes. Pl. XIII., fig. T. 
Dentition resembles that of P. haustrum, but the eusps are broader. 
Operculum oval, the nucleus sub-lateral. 
The specimen figured was collected at Lyttelton. 
The species is the same as P. tristis, Dunker. 
VoruTA PACIFICA, Lamarck. Pl. XIII., fig. v. 
Dentition.—Teeth arched, with three large subequal triangular cusps 
occupying the whole of the posterior margin. Operculwm none. 
The specimen figured was sent from Auckland by Mr. T. F. Cheeseman. 
ANCILLARIA AUSTRALIS, Sowerby. Pl. XIIL, fig. v. 
Dentition.—Central tooth slightly arched aud square at the ends with 
three rather distant cusps, the middle one of which is the smallest. There 
are no denticles : lateral teeth like Purpura. Operculum oval, the nucleus 
sub-apical. 
The specimen figured was sent from Auckland by Mr. T. F. Cheeseman. 
ConrocELLA oPHIoNE, Gray, (Lamellaria ?). Pl. XIII., fig. w. 
Shell as described by Gray. Length :25, breadth -15 inch, resembles 
that of Cryptocella latens, Adams (Gen. Moll., pl. 21, f 4, b), and covers 
the whole animal. Animal with the mantle smooth covering the whole 
shell, not fissured on the back, notched in front; yellowish, marbled with 
grey ; foot small, square in front, tapering behind, entirely covered by the 
mantle. Top of the head dark grey, or purple; eyes at the outer bases of 
the tentacles, which are large, and separated. Dentition, 1-1-1; central 
