igiS.] H. H. Godwin- Austen : Mollusca, VIII. 59Q 



periphery which is marked by a raised fine line ; aperture semi- 

 lunate, vertical; peristome simple, very slightly inflected on the 

 columellar margin; coUumellar margin oblique, thickened. 



Size: major diameter 3-4, alt. axis 24 mm. 



This a single specimen is very close to R. munipurensis, but it 

 is not so broad and the base is more conoid and flatter on the apex 

 Being also close to the Abor Rahula I introduce it here. 



Rahula koboensi, n. sp. 

 (Text- figs. 2 C ; 3 A-C.) 



Locality .— Yioho , on the north bank of the Brahmaputra River, 

 December, 1911; 2 specimens only in spirit found broken (S. W . 

 Kemp). No. 5930, Ind. Mus. 



Shell (fig. 3 A) globose, apical whorls not seen; sculpture: 

 costulation on last whorl distant, strong, sinuous, oblique, termi- 

 nating on the periphery, which has no keel, on basal side costula- 

 tion also occurs equally strong; colour pale ochraceous; whorls: 

 the last well rounded at the periphery. 



Major diameter 2*5 mm. 



This species is distinguished at once from R. aborensis by the 

 well rounded last whorl, and the absence of the lirate keel, 

 shown in the photograph made of it. It is one of the most inter- 

 esting mollusc? obtained bv Mr. Kemp. The animal of this genus 

 had never been preserved before. Of the two specimens the first 

 examined was imperfect, the head had been destroyed apparently 

 by some predaceous insect, with the second I was more fortunate. 



Animal white, spotted and banded distantly with black on the 

 visceral sac (fig. 3 C) In the second specimen this was much closer 

 together. Foot short, mucous pore at extremity of foot distinct, 

 and a broad peripodial margin. 



Generative organs were not got out satisfactorily. More than 

 two specimens are required for an animal so small as this 



Radula (fig. 3 B), centre tooth on a narrow elongate plate, tri- 

 cuspid, the centre one well developed ; admedian also elongate with 

 a single small cusp on the outer side ; marginals noticeable by being 

 tricuspid, the shortest cusp on the outer margin, the centre the 

 longest. The formula is 30.1.7.1.7.1.30, or 38,1.38. The number 

 of marginals is only approximate, they are on the outer side very 

 minute and clustered together ; being a unique specimen it was not 

 safe to try and spread them. 



Jaw (fig. 3 B) rather straight in front with a subdued central 

 projection. 



Sesara globosa, n. sp. 



(Text-fig. 2 G.) 



Localiiv.— Between Renging and Rotung (S. W. Kemp). No. 

 6129, Ind. Mus. 



