402 Descriptions of some new land shells. \No. 4, 



Bithinia nassa, T h e o b. PL xviii, Fig. 8. 



Jour. Asiat. Soc. Bengal, 1863, Vol. xxxiv, p. 275. 



Bith. testa elongato turrita, polita, diaphana, solidiuscula, iinper- 

 forata ; anfractibus 6, lente convexis, sutura simplici junctis, striis 

 exilissimis incrementi tectis ; ultimo basi convexiusculo ; spira 

 breviore ; apertura subovata, intus lcevi, supra (vel postice) acute 

 angulata, antice rotundata, sensini producta ; labio et labro leviter 

 curvatis, priuio paulo incrassato, altero acuto, margine tenui, extra 

 prope marginem costa solidiuscula crassa instructo ; operculo 

 testaceo, ovato, concentrice striato, nucleo subcentrali. 



Alt. testa3 .35, diam. max. .25, alt. apert. fere .2, lat. .15, unc. 



Habit : Shan States. 



This is a very interesting species. The shell is exactly like a 

 JBlanfordia, but it has the calcareous operculum of a Bithinia. 



Lithoglyphus Martabanensis, n. sp. PL xviii, Fig. 9. 



Testa globose conica, imperforate, solida, virescente albida, trans* 

 lucente, fere laevi,transversim exilissime striata, spira parva, regulari, 

 subobtusa ; anfractibus 4£, celeriter crescentibus, ultimo f longitudi- 

 nis scquante, apertura elliptica, antice rotundata, postice angulata. 

 Columella callosa, polita, paulo dilatata, labro acuto leviter curvato, 

 antice ad latus subtruncato. Long. .20, lat. .12, apertura .10 unc. 



Habitat rivulis quibusdam provincia " Martaban." 



A few examples of this interesting addition to the Pegu fauna 

 were forwarded to me from the Martaban district, by F. N e p e a n, 

 Esq., of the Forest Department, mixed with the common Paludinas 

 and Jfelanias of the district. The operculum is horny. The general 

 form of the shell, and the peculiar flattening of the columellar lip, 

 quite agrees with the European species of Lithoglyphus. Gould's 

 Amnicola cincta from Tenasserim has been suspected by F r a u e n- 

 f e 1 d to belong to Lithoglyphus, but it is tolerably certain that 

 Gould's species is very closely allied to, if not identical with, 

 Paludomus labiosa B e n s o n. 



