310 MR. A. GARRETT ON THE TERRESTRIAL [Mar. 1, 



two caiiiiations are evanescent. It is probably a distinct species. 

 The tj'pe is also distributed throughout the group, and occurs at 

 "WaUis Island. 



This species may be recognized by its conical form, pale horn- 

 colour beneath a light brownish epidermis, 6 convex whorls, incised 

 suture, and filocarinate periphery. The basal perforation is margined 

 by a rather distant keel. Length 6 millim. 



] 1 . OiMPHALOTROPIS LAYARDIANA, Sp. UOV. 



Realea (Ompkalotropis) rosea, Mousson (not of Gould), Journ. de 

 Conch. 1870, p. 192. 



Omphalotropis bythinaformis, " MSS.," Paetel, Cat. Conch, 

 p. 124 (ex Schmeltz in Cat. Mus. Godeff. iv. p. 74). 



I obtained several specimens of this species at Vanua Balavo, one 

 of ihe Windward Islands. It may be described as follows : — 



Shell umbilicated, rather solid, ovate-conic, smooth, scarcely 

 shining, uniform corneous ; spire rather short, convexly-conical, apex 

 obtuse ; suture slightly incised ; whorls 6-7, convex, narrowly 

 tabulated, last one rounded ; umbilicus large ; basal keel large, and 

 distant from the umbilical opening; aperture abbreviately ovate, 

 angular po.-teriorly and rounded in front ; peristome obtuse, margins 

 nearly or quite continuous. 



Length 6, diam. 4 millim. 



It differs from O. rosea in its smaller size, more abbreviate form, 

 more swollen whorls, large umbilicus, and remote keel. 



Genus Lagochexlus, Blanford. 

 1. Lagocheilus hispidus, Liardet. 



Lagocheiius hispidus., Liardet, Proc. Zool. Soc. 1876, p. 101, 

 pi. 5. figs. 10, 10a. 



"Shell small, bulimoid, hispid, of a brown colour; whorls 5^, 

 spirally costate: aperture circular. 



" Hab. Gomia, Fiji." {Liardet.) 



The existence of this East-Indian genus in the Viti group is 

 remarkable. So far as known, it has not been detected in any other 

 part of the Pacific. 



Genus Helicina, Lamarck. 

 1. Helicina TECTiFORMis, Mousson. 



Helicina tectiformis, Mousson, Journ. de Conch. 1870, p. 199, 

 pi. 8. fig. 7 ; Paetel, Cat. Conch, p. 126 ; {Trochatella) Brazier, 

 Proc. Zool. Soc. 1871, p. 322 ; Schmeltz, Cat. Mus. Godeff. v. 

 p. 98 ; Pfeiffer, Mon. Pneum. iv. p. 250. 



Helicina mangoensis, Sowerby, Proc. Zool. Soc. 1870, p. 250. 



This fine species appears to be peculiar to the small island of 

 Mango, where it is very abundant on coralline rocks. 



x\ depressedly-conical, acutely carinated species of a uniform white 

 colour, with a sulphur-yellow spire ; frequently greyish, more or less 



