188 7.] MOLLUSKS OF THE VITI ISLANDS. 307 



the Tonga group. All the species of this genus live beneath decay- 

 ing vegetation. 



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

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

 one perforated and slightly keeled close to the perfora:tion. Length 

 3| millim. 



2. Omphalotropis parva, Mousson. 



Ompkalotropis parva, Mousson, Journ. de Conch. 1865, 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. Pneum. iv. p. 224. 



Realia Icevis, Baird, in Brenchley's Cruise of Cura9oa (ex Schmeltz, 

 in CM. G. V. p. 101). 



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

 pi. 5. figs. 11, 11 a. 



This small species is not only generally diffused throughout the 

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

 Dr. Baird gives " Samoa " as habitat ; neither Graflf'e 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. Pneum. iv. p. 227. 



This species was found by Dr. GriifFe 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 LONGXJLA, Mousson. 



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

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



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



Lihabits Ticombia, one of the Windward Islands. 



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

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

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

 the peristome slightly expanded. Length 6 millim. 



5. Omphalotropis circumlineata, Mousson. 



Realia {Omphalotropis) circumlineata, ^lousson, 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. Griifife on Vanua 

 Balavo and Viti Levu. 



