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Show 1881.] SOCOTRAN LAND-SHELLS. 809 the aperture on the outer margin ; aperture ear-shaped, contracted; peristome thin, reflected, continuous, a small double tooth on the outer margin, with another strong tooth on the columellar margin. Largest specimen, size:- Major diam. 0*27, alt. apert. 0*22, alt. axis 0*48 inch. „ ,, 6*8, „ 5*7, ,, 12 millim. Locality. South side of the island, on limestone rocks at nearly 1000 feet. [This shell was first discovered by a French officer of marines, Monsieur Passama.] 17. ENNJE'A BALFOURI, n. sp. (Plate LXVIII. fig. 12.) Shell elongately fusiform, rather solid; sculpture very regular shallow ribbing ; colour wax-white or dull pale umber ; spire elongate, sides convex, apex blunt; suture shallow; whorls 6, flatly convex ; aperture subvertical, oval, one flat-shaped tooth on body-whorl ; peristome continuous, with a narrow notch on the upper outer margin of the aperture; columellar margin strong, with a single tooth, and one largely developed triangular tooth on the outer margin. Size:- Major diam. 0*24, alt. axis 0*58, alt. apert. 0'24 inch. „ „ 6*1, „ 14*5, „ 6*2 millim. Locality. On the slopes of the ridge bounding the Gollonsir valley. [The ridge is capped with limestone resting on a granite basis. This shell I did not find abundantly, and only on the slope of the hill below the limestone cap ; altitude over 500 feet. -B. B.~\ 18. PUPA SOCOTRANA, n.sp. (Plate LXVIII. fig. 13.) Shell fusiform, oblate; sculpture smooth, covered with pale umber epidermis ; spire with slightly convex sides ; suture shallow ; whorls 6 ; aperture elongately oval, subvertical; peristome moderately thickened, slightly rimate on the middle of the outer margin, where there is a single rounded solid tooth ; columellar margin strong, perpendicular, with a weil-developed tooth. Size:- Major diam. 0*15, alt. axis 0-32, alt. apert. 0*13 inch. „ „ 4-0, . „ 80, „ 3*5 millim. Locality. [Found under granite boulders over 2000 feet.- B.Bf\ 19. STENOGYRA GOLLONSIRENSIS, n. sp. (Plate LXIX. fig. 1.) Shell dextral, elongately turreted; sculpture smooth, with shallow lines of growth ; colour dull white ; spire turreted, apex rounded, solid ; suture moderately impressed; whorls 12, sides very slightly convex ; aperture fusiform ; peristome thin ; columellar margin solid, straight, and scarcely reflected. |