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Show 170 MR. A. GARRETT ON THE TERRESTRIAL [Feb. 15, colour, and nodulous columella. It is more depressed and paler than the preceding species. 4. MICROCYSTIS EXCRESCENS. Nanina (Microcystis) excrescens, Mousson, Journ. de Conch. 1870, p. 115, pl. 7. fig. 5, 1871, p. 8 ; Paetel, Cat. Conch. 1873, p. 84; Schmeltz, Cat. Mus. Godeff. v. p. 91. Llelix excrescens, Pfeiffer, Mon. Hel. vii. p. 67. Microcystis excrescens, Garrett, Journ. Phil. Acad. Nat. Sci. 1881, p. 381. This small species was found by Dr. Griiffe on the eastern portion of Viti Levu and on several islands in the Tonga group. I discovered it on one of the Cook's Islands. It is nearly of the same size and shape as M. nodulata, with the columellar fold of M. kioaensis, but is much smaller than the latter species. 5. MICROCYSTIS UPOLENSIS. Nanina upolensis, Mousson, Journ. de Conch. 1865, p. 166 ; (Microcystis) 1869, p. 327; 1870, var. oneataensis, p. 114; (Thalassia) Paetel, Cat. Conch. 1873, p. 85; Schmeltz, Cat. Mus. Godeff. v. p. 90. Helix upolensis, Pfeiffer, Mon. Hel. v. p. 108. Helicopsis upolensis, Pease, Proc. Zool. Soc. 1871, p. 475. Helix samoensis, Baird, in Brenchlev, Cruise of the ' Curacoa,' p. 447, pl. xl. figs. 12, 13. This species was first described from specimens collected by Dr. Graffe on Upolu, one of the Samoa Islands, and I subsequently discovered it on the islands of Vanua Balavo and Oneata. A very smooth, highly polished, orbicular, depressed, pale horn-coloured species with a slight columellar nodule. 6. MICROCYSTIS SORORIA. Helix sororia, Cox, Proc. Zool. Soc. 1870, p. 83 ; Pfeiffer, Mon. Hel. vii. p. 60. This species, which is unknown to me, was discovered by Mr. Brazier at Ovalau. A small imperforated, thin, smooth, shining species of the depressed-globose form, witb five moderately convex whorls, of a uniform yellowish-olive colour, and with a simple columella. 7- MICROCYSTIS FIRMOSTYLA. Nanina firmostyla, Mousson, Journ. de Conch. 1865, p. 166; (Microcystis) 1871, p. 7; Schmeltz, Cat. Mus. Godeff. v. p. 90; (Microcystis) Paetel, Cat. Conch. 1873, p. 84. Helix firmostyla, Pfeiffer, Mon. Hel. v. p. 70. Helicopsis firmostyla, Pease, Proc. Zool. Soc. 1871, p. 475. Obtained by Dr. Graffe at Tikombia, one of the Windward Islands. H e also found it generally distributed throughout the Tonga Islands. A minute, depressed-convex, highly polished, horn-coloured species, shaped like M. upolensis, but only half as large. The columella is sometimes slightly nodulous. |