896 MOLLUSCA. 



epidermis, are the principal distinguishing characters from typical Tenasserim 

 P. labiosa; it is, I consider, quite distinct from P. blanfordiana. 



Paltjdomtjs blani^ordiana, Nevill. 



Paludomus lahiosa, Con. Indica, pi. 108, fig". 9 (not o£ Bens.) 

 Faludomus blanfordiana, Nevill, ^. c, p. 37. 



There are a good many specimens in the Indian Museum from Pegu and Ava, 

 also from Gauhati in Assam, agreeing exactly with the shell figured as above in 

 the * Con. Indica' ; there are also seven typical specimens of P. labiosa, collected by 

 Mr. Theobald in Tenasserim : these latter are a good deal smaller and less angu- 

 larly globose than the Pegu species ; their columellse are more vividly stained with 

 brown, the brown bands are less regular and distinct (showing in an especially marked 

 way within the aperture), and finally both young and old specimens are truncated, 

 which is apparently never the case with the former ; the sculpture of both is the 

 same, quite smooth except for a few irregular spiral striae below the suture ; typical 

 specimens of P. labiosa are without opercula ; those of P. blanfordiana resemble 

 opercula of P. regulata, though they are even less rugose, the spiral striae of the 

 nucleolar portion of the inner side being distinct and regular (seen through the lens). 



P. labiosa from Tenasserim, long. max. 12^, diam. 10 mm. 



P. blanfordiana, type from Ava, long. max. 19, diam. 15 mm. 



P. blanfordiana, var. from Assam, long. 20, diam. 15 mm. 



This species resembles as closely P. ornata, as it does typical Tenasserim 

 P. labiosa ; specimens from Assam differ in no respect from Burmese ones, except 

 by the spire being a trifle more produced ; this locality for the species is interesting ; 

 it appears to be very abundant there. 



Genus Melania, Lamarck. 



Sub-Genus Stria tella, Agardh. 



Melania (Striatella) tuberculata, Mlill. 



Nerita iuherczdata, MiilL, Verm. Terr, et Eluv., 1774, p. 191. 

 Melania {Striatella) tuberculata, Nevill, I. c, p. 32. 



Two forms of this very common and variable shell were found abundantly in 

 the old channel of the Irawady at Myadoung ; the commoner of the two somewhat 

 resembles pi. Ixxiv, fig. 1, of the ' Con. Indica,' but is more richly coloured, with the 

 brown band at base remarkably broad and distinct ; the whorls are a little narrower 

 and more produced, the transverse ridges very acute and prominent, the longitudi- 

 nal ribs nearly, or altogether, obsolete on the last two or three whorls; the upper 

 two or three whorls are, as usual, decollated. 



