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Show 302 MR. A. GARRETT ON THE TERRESTRIAL [Mar. I, It is a long, slender, greyish-white species, with 5 persistent subconvex whorls and a deep suture; the riblets, of which there are 18 to 20 on the last whorl, are thin, sharp, and separated by rather wide interspaces. The vertical aperture is obtusely biangulately ovate, and the porrected peristome is continuous, expanded, and slightly reflected. Length 9 millim. 3. TAHEITIA ARCASIANA (Crosse). Truncatella arcasiana, Crosse, Journ. de Conch. 1868, p. 177, 1870, p. 107, pl. 7. fig- 13; Mousson, Journ. de Conch. 1870, p. 196; Schmeltz, Cat. Mus. Godeff. v. p. 104; Pfeiffer, Mon. Pneum. iv. p. 20. Truncatella alternans, Mousson, in Cat. Mus. Godeff. iv. p. 76. This species (which is unknown to me) was found by Dr. Graffe in the interior of Viti Levu. Mr. Crosse says it is an elongated, cylindrically-turreted, chalky, dull whitish species, 9 millim. long, with remote riblets, which are sometimes evanescent on the middle of the whorls. The persistent 6 whorls are rather convex, the suture is impressed, and the aperture suboval. The peristome is continuous, porrected, and slightly expanded. 4. TAHEITIA SCALARIFORMIS (Reeve). Truncatella scalariformis, Reeve, Proc. Zool. Soc. 1842, p. 197; Conch. Syst. ii. pl. 182. fig. 6; Pfeiffer, Zeit. Malak. 1846, p. 186; Mon. Auric, i. (Appendix) p. 191 ; Jay, Cat. Shells, 1850, p. 252 ; Kiister, Mon. p. 15 ; H. & A. Adams, Gen. Moll. ii. p. 31 ; Schmeltz, Cat. Mus. Godeff. v. p. 104. Truncatella truncatula, var., Anton, Verz. Conch, p. 62. Truncatella arctecostata, Mousson, Journ.de Conch. 1869, p. 68, pl. 5. fig. 4, 1870, p. 195; Paetel, Cat. Conch, p. 117; Schmeltz, Cat. Mus. Godeff. iv. p. 76 ; Pfeiffer, Mon. Pneum. iv. p. 19. Taheitia scalariformis, Pease, Proc. Zool. Soc. 1871, pp. 468, 477 ; Journ. de Conch. 1871, p. 92 ; Martens & Langk. Don. Bismark. p. 60, pl. 4. fig. 1. Prof. Mousson's original description of T. arctecostata was drawn up from specimens of T. scalariformis collected by me at Anaa, Paumotu Islands. The same, or a very closely allied, species was subsequently discovered by Dr. Griiffe on Viti Levu, and referred by Mousson to T. arctecostata. I have not seen any Viti specimens. It is a thin, subpellucid, cylindrically-turreted, yellowish-white or corneous species, with 4 or 5 persistent convex whorls. The riblets are numerous (38 to 40 in the last whorl), very slightly arched, and converging at the base. The aperture is vertical, small, broadly ovate, and the peristome is thin, continuous, and expanded. Operculum typical. Length 6 millim. Genus DIPLOMMATINA, Benson. 1. DIPLOMMATINA MARTENSI, H. Adams. Diplommatina (Diancta) martensi, H. Adams, Proc. Zool. Soc. |