890 MOLLUSCA. 



Three dead specimens only of this interesting form were found on the First 

 Expedition on the Kakhyen Hills ; the spne is a trifle more depressed than in typi- 

 cal specimens from the Shan States. 



Pteeocyclus teddeni, Blanf. 



FterocyolusfecUeni, Blanf., Journ. As. Soc, Bengal, vol. xxxiv, 1865, p. 93 ; Con. Indiea, pi. 134, 

 fig. 1 ; Nevill, I. c, p. 29. 



Tolerably abundant at Bham6 and above the Great Limestone CM, 2nd Defile, 

 Irawady. 



Gemis Altc^tjs, Gray. 



ALTCiETJS AMPHOBA, BenS. 



^/^(?«?M fl:mji;-^om, Bens., Ann. and Nag. Mat. Hist., ser. 3, 1856, vol. xvii, p. 226; Con. Indiea, 

 pi. xci, figs. 2, 3; Nevill, I. c, p. 29. 



A few small specimens of the widely distributed Burmese species were found 

 at Bham6. 



CTENOBRANCHIA. 



Family— PJi VBINIJ)^. 

 Genus Bithtnia, Gray. 



BlTHTNIA GONIOMPHALOS, Morl. 



Faludina goniomphalos, Mori., Rev. et Mag. ZooL, 1866, p. 167 ; Ser. Conch., iii, pi. xiii, fig. 4; 



Nevill, 1. c., p. 29. 

 Bithynia iravacUca, Blanf., Proe. Zool. Soc, 1869, p. 446; Con. Indiea, pi. xxvii, fig. 10. 



A comparison of the type specimens in the Indian Museum of B. iravadica 

 with typical specimens of P. goniomphalus from Cochin China prove the two 

 species to be perfectly identical. Specimens from Siam of B. siamensis, Lea, are 

 exceedingly closely allied, and may prove to be only a variety ; they differ, how- 

 ever, by their smaller size, and by the last whorl being rounded and not ungulate, 

 as is the case in P. goniomphalus. This species was obtained abundantly by 

 Dr. Anderson at Ava, Mandalay, and Kabyuet. 



Bithtnia turkita, Blanf. Plate LXXX, figs. 4 & 4«. 



FairlanJcia? (Bitki/niaJ turrita, Blanf., Proc. Zool. Soc., 1869, p. 446. 

 Bithjnia turriia, Nevill, I. c, p. 29. 



This most distinct and interesting species was not found on the Second Expe- 

 dition; the single type in the Indian Mtxseum, therefore, remains unique. The 

 species is, I think, a true Bithynia, certainly not a Fairbankia. It was found at 

 Kyoutong, in Upper Burma. 



