I9I7-] H. H, Godwin-Austen: Molltisca, VII. 573 



Raphaulus shimangcnsis, n. sp. 



(Text-fig. 2 E.) 



Locality. — Shimang Valley {Capt. G. F. T. Oakes, R.E.). 



Shell tumidly cylindrical, solid, openly rimate; sculpture very 

 fine and regular costulation ; colour bleached ; spire moderately high , 

 apex pointed, inclining to the right ; suture moderately impressed ; 

 whorls 5; aperture circular; peristome thickened, horizontal on 

 upper margin ; sutural tube ascending obliquely. 



Size: major diameter 7'o. minor 6-5, alt. axis 120 mm. 



Approaches R. aborensis, but is smaller. 



The Shimang River is a large tributary of the Tsanspu from 

 the West, about 36 miles above Pasighat at the base of the 

 mountains. 



Genus Strcptaulus, Benson, 1857. 



Strcptaulus miriensis, n. sp. 



Locality. — Miri Hills, only one specimen, since broken {Lieut. 

 C. G. Lewis, R.E.). 



Shell cylindrical, pupiform, strongly excavated and keeled on 

 umbilical region ; sculpture very fine transverse regular striation ; 

 colour bleached; spire high, apex conic; whorls 6, the 4tli with 

 the greatest diameter, sides flatly convex, the aperture circular; 

 peristome thickened, not continuous on upper margin. 



Size: major diameter 5'0, minor 5*0, alt. axis 9*4 mm. 



After getting as far as writing the above description I left my 

 work room for lunch, leaving the shell on a slide resting on plasti- 

 cine. On taking up work again I found it crushed. Thus one of the 

 most interesting shells found recently on the Eastern Frontier 

 has to be rediscovered. It was interesting because the sutural 

 tube was exactly like that of Raphanhis hlanfordi of Sikhim, viz. 

 a narrow flat band running back along the suture with here and 

 there minute perforations (vide Mollusca of Lndia, plate xlvii, fig. 

 4a). Very fortunately I had compared the two species and noted 

 that the Miri shell was quite distinct, that the antepenultimate 

 whorl was the largest and the sculpture was very much finer, 

 the deep excavation at the umbilicus was another very remarkable 

 character. 



Streptaulus luyorensis, n. sp. 



Locality. — Luyor Valley, 2 specimens [Capt. G. F. T. Oakes, 

 R.E.). 



Shell umbilicated, Pw/)ma-like, solid, shining; sculpture fine 

 close shallow striation ; colour pale ochraceous ; spire fairly high , 

 apex blunt and rounded; suture impressed; whorls 6, 4th and 

 5th the largest and nearly equal in diameter ; aperture circular ; 

 peristome thickened, reflected, with a callous on the body whorl; 

 the sutural tube flattened, follows the suture and is perforated 

 finely at intervals. 



