I9I5-] H. H. Godwin-Austen : Mollusca, III. 499 



Shell (fig. 4a) openly umbilicated , depressedly orbiculate, 

 somewhat globose. Sculpture, only fine epidermal lines of growth. 

 Colour dark sienna brown, crossed by dark bands, running from 

 the suture to the narrow black periphery band. Spire slightl}^ 

 raised, very depressedly conoid. Suture deep. Whorls 4, the last 

 rapidly increasing. Aperture circular, sub-vertical. Peristome 

 slightly reflected, not much thickened, the outer lip is expanded 

 near the suture, with sides turned in forming a spout-like projec- 

 tion. Close behind this and adjacent to the suture is an apparent 

 tube (fig. 4), but it is rather of gutter form, semi-circular in section, 

 and is given off from a cleft on the columellar side just within 

 the aperture (fig. 46), which is not an orifice — if it were so the 

 gutter would be a true tube and the shell a Spiraciilum. It illus- 

 trates how the sutural tube in that genus has originated. This 

 species is on the borderland of the two genera Pterocyclos and 

 Spiraculum. It must be put in Pterocyclos , because the tube is 

 close to the aperture, almost a part of the peristome. In Spira- 

 culum the tube is remote from the aperture. Operculum concave 



Text-fig. i. — Pterocyclos hrahiiiaktnnh'vsis, n. sp. 



in centre, multispiral, suture not raised. 



Size: major diam. i5'0; alt. axis 475 mm. 

 Type No. 3082 Brit. Mus. 



Pterocyclos brahmakundcnsis, n. sp. 



Locality : Brahmakund, Eastern Assam (M. T. Ogle). Three 

 specimens were found. 



Shell very depressedly discoid, smooth throughout, very widely 

 umbilicated ; sculpture fine and close, transverse lines of growth 

 on the epidermis; colour sienna brown, more ochraceous below, 

 indistinctly mottled, passing into zig-zag markings on the apical 

 whorls, a narrow black peripheral band ; spire very flat, scarcely 

 raised above the last whorl; suture well impressed; whorls 5, 

 rounded on periphery, narrowing rapidly, rather closely wound, 

 the last descending ; aperture circular, oblique; peristome double, 

 fairly strong, reflected, inner lip continuous, shallowly sinuous on 

 the upper inner margin next the wing, this is spout shaped. 



