214 Records of the Indian Museum, [Vol. XIV, 



in the usual way, entirely concealing the umbilicus and in continuity 

 with the outer lip ; it is deeply grooved and plicated longitudinally 

 and does not extend so far over the surface of the shell as in some species. 

 The characteristic longitudinal striae are well developed but rather 

 fine ; the spiral sculpture consists entirely of incised lines, which are 

 often slightly diverted where they are crossed by the stronger longi- 

 tudinal stri :e. On the apex of the shell, which is perhaps worn in all 

 the specimens examined, the spiral Hues are obscure, but they are dis- 

 tinct and numerous on the last three whorls. On each of these whorls 

 two or three of them are particularly deep on the upper surface just 

 outside the suture. On the body-whorl the lines are obsolete or obso- 

 lescent on the central region but exceptionally strong on the upper part 

 of the lowe.it third ; at the base of the whorl they are well-marked but 

 not so broad or so deep. 



Measurement of shells (in millimetres). 



Type. 



Length 



Breadth 



Length of aperture 



Breadth of aperture 



Type sjyecimen. — M. ^-:p-, Zool. Survey of India {Ind. Mus.). 



Locality, etc. — A large number of dead shells were collected by 

 Mr. A. P. Morris in obsolete mud-volcanoes at Kin-U north of Shwebo 

 in the Chindwin Valley. They seem to have accumulated in the poob 

 of the mud-volcanoes when the latter became inactive and are probably 

 subfossil. With them were found several shells of Vivpara viridis 

 (Reeve) and Ampidlaria winJdeyi, Pilsbry and one of Bifhynia goniom- 

 pludos (Morelet). 



The shell of T. incisa differs from tha.t of all the species previously 

 assigned to the genus in having only 5| whorls and in its incise 1 sj^iral 

 sculpture, but has the characteristic columellar callus well developed. 

 It is perhaps related to Vivipava chalanguensis (Deshayes) from Cam- 

 bodia. A species of Taia, T. noetlingi (Kobelt), has already been 

 recorded from the Chindwin Valley. 



\ 



