J 877.] Upper Burma and Yunnan. 33 



distinct ; the whorls are a little narrower and more produced, the transverse 

 ridges very acute and prominent, the longitudinal ribs nearly, or altogether, 

 obsolete on the last two or three whorls ; the upper two or three whorls are, 

 as usual, decollated. 



Long. max. 27-1, diam. 9 mil. 



The other form is shorter and more rounded, of a pale green, with 

 scarcely any brown spots or markings and with the basal band nearly, or 

 altogether, obsolete ; the transverse ridges are irregular and less acute, the 

 longitudinal ribs, on the contrary, strongly developed, becoming obsolete 

 only below the middle of the last whorl ; decollated like the preceding. 



Long. max. 20, diam. 8 mil. 



Melania (Melanoides) jiigicostis, Bens. 

 Melania jugicostis, Bens. MS., Con. Indica, pi. 110, figs. 8, 9. (Tenasserim Rv.). 



Unfortunately, only two specimens of this interesting species were 

 brought back by Dr. Anderson ; they were found at Myadoung with the 

 preceding and following species. The sj^ecies seems to me to belong rather 

 to Melanoides than to JPlotia ; it certainly a good deal more resembles the 

 Chinese M. cancellafa, Bens., than Plotia scahra ; in either case it is a very 

 distinct and well characterized species, and is admirably figured in the ' Con. 

 Indica.' Shell small, slightly decollated ; whorls five, abruptly angular, 

 smooth and shining, with a few rather distant, somewhat obsolete and irre- 

 gular, transverse ridges on the lower half of the last whorl ; longitudinally 

 angularly ribbed, ribs very distant, thick and prominent, almost varicose, 

 eight of them on the last whorl, disappearing towards the base ; very pale 

 green, with no markings except a subobsolete brown band at base. 



Long. 12, diam. 6 mil. • 



Melai^ia (Mela:n-oides) Iravadica, Blf. 



Melania Iravadica, Blf., P. Z. S., 1869 ; Con. Indica, pi. 71, fig. 1. 



This seems to me to be the Upper Burmese form of a shell described 

 by Gould as M. laccata, Proc. Bost. Soc, 1847. Mr. Theobald has present- 

 ed a series to the Museum from the Upper Salween Eiver, well figured in 

 the ' Con. Indica,' pi. 75, figs. 3, 11 and by Brot in the ' Conch. Cabinet,' 

 pi. 9, fig. 6 ; at first sight they seem to differ considerably from the form 

 described as M. Iravadica ; there is scarcely, however, any real difference, 

 excej)t the larger size and more distinct sculpture of typical 31. haccata, 

 which has three rows of nodules, the upper one of which is altogether obso- 

 lete in M. Iravadica ; in one or two specimens, however, of the former this 

 row is also obsolete. The type specimens of M. Iravadica are in the Indian 

 Museum. 

 5 



