1887.] MOLLUSKS OF THE VITI ISLANDS. 307 



the Tonga group. All the sj)ecies of this genus live beneath decay- 

 ing vegetation. 



A smooth, ovate-veutricose, yellowish horn-coloured species, 

 with two faint transverse zones, and six subiuflated whorls, the last 

 one perforated and slightly keeled close to the perforation. Length 

 3| millim. 



2. Omphalotropis parva, Mousson. 



Omphalofropis parva, jNIousson, Journ. de Conch. 186.5, p. 199 ; 

 Pease, Journ. de Conch. 1869, p. 147 ; Paetel, Cat. Conch, p. 124; 

 Schmeltz, Cat. Mus. Godeff. v. p. 101. 



Realia (Omphalotropis) parva, Mousson, Journ. de Conch. 1871, 

 p. 28 ; Pfeiffer, Mon. Pneuni. iv. p. 224. 



Realia Icevis, Baird, in Brenchley's Cruise of Curafoa (ex Schmeltz, 

 in C. M.G. V. p. 101). 



Omphalotropis vitiensis, Liardet, Proc. Zool. Soc. 1876, p. 101, 

 pi. 5. figs. 11, 11a. 



This small species is not only generally diffused throughout the 

 group, but occurs also in the Tonga and Ellis group of islands. 

 Dr. i3aird gives "Samoa" as habitat; neither Griiffe nor myself 

 detected it in that group. 



A small, smooth, ovate-conical species, 4| millim. long, of a pale 

 corneous, yellowish, or violaceous horn-colour, with 6 convex whorls, 

 and a strong basal keel contiguous to the perforation. 



3. Omphalotropis ingens, Mousson. 



Realia {Omphalotropis) ingens, Mousson, Journ. de Conch. 1870, 

 p. 189 ; Pfeiffer, Mon. Pueum. iv. p. 227. 



This species was found by Dr. Graffe in Oneata, where it occurred 

 in a semi-fossil condition. 



An acutely-ovate species, with longitudinal riblets and 7 flattened 

 whorls, the last with a basal filiform keel. Length 7 millim. 



4. Omphalotropis LONGULA, Mousson. 



Realia {Omphalotropis) longula, Mousson, Journ. de Conch. 

 1870, p. 193 ; Pfeiffer, Mon. Pneum. iv. p. 233. 



Omphalotropis longula, Paetel, Cat. Conch, p. 124. 



Inhabits Ticombia, one of the Windward Islands. 



This species may be characterized by its smooth, rather thin, sub- 

 pellucid, conically-turreted form, 7 sliglitly convex whorls, the last 

 one rounded and filocarinate at the base. The aperture is oval, and 

 the peristome slightly expanded. Length 6 millim. 



5. Omphalotropis circumlineata, Mousson. 



Realia {Omphalotropis) circumlineata, Mousson, Journ. de Conch. 

 1870, p. 191, pi. 7. fig. 11 ; Pfeiffer, Mon. Pneum. iv. p. 230. 



Omphalotropis circumlineata, Paetel, Cat. Conch, p. 124. 



Garrettia 1 circumlineata, Schmeltz, Cat. Mus. Godeff. v. p. 100. 



This interesting species was discovered by Dr. Graffe on Vanua 

 Balavo and Viti Levu. 



