498 Records of the Indian Museum. [Vol. VIII, 



narrow, ridge on the reflected whorl, the epidermis being pecu- 

 liarly shining. A little further development would constitute this 

 a tube, such is its appearance. Operculum multispiral, about 10 

 whorls, the edges slightly raised and furred on outer margin. 



Size: major diam. 21*5; alt. axis 5*0 mm. (Type immature, 

 ist received). Major diam. 22*5; alt. axis 9'5 mm. (full-grown 

 example). 



Type No. 3089 Brit. Mus. 



Pterocyclos aborensis, n. sp. 

 (PI. xxxix, figs. I, la). 



Locality. Abor Hills, No. 3104 B.M. Type; 3046 B.M, Pong- 

 ing; 3050 B.M. Rami lyambang, 4-i-i3 {Oakes). 



Shell subdepressedly turbinate, very openly umbilicated. 

 Sculpture, epidermal lines of growth strong. Well raised distant 

 spiral lirae, both on upper and lower side. The one next the 

 suture the most conspicuous, with two less pronounced interven- 

 ing, about 14 altogether. Colour a rich umber brown. Spire 

 subconoid, apex small. Suture deep. Whorls 5, regularly in- 

 creasing, angulately rounded on periphery. Aperture circular. 

 Peristome double, not thickened, slightly reflected, inner lip 

 continuous, the outer expanded forward at inner angle into a half 

 closed spout-shaped wing. Columellar margin sub-vertically curved. 

 Operculum not seen. 



Size: major diam. 26*0; alt. axis 100 mm. 



Type No. 3104 Brit. Mus. 



Pterocyclos^miriensis, n. sp. 

 (PI xxxix, figs. 2, 2a, 2h, 2c). 



Locality. Miri Hills. Four specimens obtained. 



Shell depressedly discoid, very widely umbilicated. Sculp- 

 ture very strong, regular spiral hrae, above and below. Colour 

 rich burnt sienna brown. Spire very flatly conic. Suture well 

 impressed. Whorls 5, subangularly rounded on the periphery. 

 Aperture circular, sub-vertical, just shows above the last whorl. 

 Peristome double, not thickened, slightly reflected, inner lip thin, 

 continuous, the outer expanded into a wing, openly spout shaped. 

 Columellar margin well rounded. 



Size: major diam. 30-0; alt. axis 8'0 mm. 

 Type No. 3580 Brit. Mus. 



Three specimens to Indian Museum. 



Pterocyclos spiramentum, n. sp. 



(PI. xl, figs. 4, 4a, 46). 



Locality. Abor Hills, only one specimen obtained but that is 

 in perfect condition [Oakes). 



