Hutton. — 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. 



Polytropa quoyi, Keeve. PI. XIII., fig. q. 



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. Cbeeseman. 



The columella in this species is rounded and the operculum is muricoid. 

 It is evidently not a Polytropa but a Trophon. 



Polytropa striata, Martyn. PI. XIII. , fig. R. 



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. 



Polytropa scobina, Quoy and Gaimard. PI. 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 cusps are broader. 

 Operculum oval, the nucleus sub-lateral. 



The specimen figured was collected at Lyttelton. 



Tbe species is the same as P. tristis, Dunker. 



Voluta pacifica, Lamarck. PL XIII. , fig. u. 



Dentition. — Teeth arched, with three large subequal triangular cusps 

 occupying the whole of the posterior margin. Operculum none. 



Tbe specimen figured was sent from Auckland by Mr. T. F. Cbeeseman. 



Ancillaria australis, Sowerby. PL XIII. , fig. v. 



Dentition. — Central tootb slightly arched and 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. Cbeeseman. 



Coriocella ophione, Gray, [Lamellaria ?). PL XIII. , fig. w. 



Shell as described by Gray. Length -25, breadth -15 inch, resembles 

 that of Crypiocella latens, Adams (Gen. Moll., pi. 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 



