OCR Text |
Show 1887.] MOLLUSKS OF THE VITI ISLANDS. 307 the Tonga group. All the species of this genus live beneath decaying 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 perforation. Length 3| millim. 2. OMPHALOTROPIS PARVA, Mousson. Omphalotropis 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. Mealia (Omphalotropis) parva, Mousson, Journ. de Conch. 1871, p. 28; Pfeiffer, Mon. Pneum. iv. p. 224. Realia lavis, Baird, in Brenchley's Cruise of Curacoa (ex Schmeltz, in C.M.G. v. p. 101). Omphalotropis vitiensis, Liardet, Proc. Zool. Soc. 1876, p. 101, pl. 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 Graffe nor myself detected it in that group. A small, smooth, ovate-conical species, 4g 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. Graffe in Oneata, where it occurred in a semi-fossil condition. A n 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 slightly 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, pl. 7. fig. 11 ; Pfeiffer, Mon. Pneum. iv. p. 230. Omphalotropis circumlineata, Paetel, Cat. Conch, p. 124. Garrettia ? circumlineata, Schmeltz, Cat. Mus. Godeff. v. p. 100. This interesting species was discovered by Dr. Graffe on Vanua Balavo and Viti Levu. |