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 hich. 

 „ ,, 6-8, „ 57, „ 12 millim. 



Localitij, 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. Enn^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 elon- 

 gate, 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 mode- 

 rately thickened, slightly rimate on the middle of the outer margin, 

 where there is a single rounded sohd tooth ; columellar margin strong, 

 perpendicular, with a well-developed tooth. 



Size : — 



Major diam. 0'15, alt. axis 0-32, alt. apert. 0"13 inch. 

 „ „ 4-0, ,, 8 0, „ 3-5 miUim. 



Locality. [Found under granite boulders over 2000 feet. — 

 B.B.^ 



19. Stenogyra GOLLONSiRENSis, n. sp. (Plate LXIX. fig. 1.) 



Shell dextral, elongately turreted ; sculpture smooth, with shal- 

 low 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. 



