1920.] N. AnnandalE : Indian Freshwater Gastropods. 115 



Upper Burma and across China to the Philippines, Formosa and 

 Japan, but I am not sure as to the generic identity of some of 

 the Far Eastern species.' The only one of those of which I have 

 been able to examine the soft parts is Vivipara chinensis (Gray) 

 from Yunnan. This species, from which I regard L. lecythis as 

 specifically distinct, agrees in the structure of the mantle and 

 operculum with the type-species of the new genus. 



All the Asiatic genera of the Viviparidae are closely similar 

 in anatomy, but the structure of the mantle-edge and its sphinc- 

 ter is characteristic. 



Genus Taia, Annandale. 



1918. Taia, Annandale, Rec. Ind. Mas., XIV, pp. 123, 160. 



1919. Taia, id., Rec. Geol. Surv. Ind., L, p. 231. 



I have already discussed this genus in the papers cited and 

 here need only give my reasons for regarding the subfossil Tem- 

 notaia incisa as generically distinct. In the key on page in I have 

 pointed out the distinctive characters of the mantle. 



- Temnotaia, Annandale (1919). 



1919. Temnotaia (subgenus of Taia), Annandale, Rec. Geol, Surv., 

 Ind. L, p. 231. 



The discovery of a recent specimen * of Temnotaia in the old 

 collection of the Indian Museum renders it advisable to enlarge 

 the original description slightly and to separate the species generi- 

 cally from Taia. 



The shells of the genus thus proposed are rather narrowly 

 ovate, externally smooth and without prominent spiral sculpture 

 but bearing rather coarse longitudinal striae and either micro- 

 scopic spiral striae or well-defined incised lines. There are 5^ to 

 6| whorls, and the spire is exserted and acuminate. The mouth 

 of the shell is ovate, with the outer lip thin and not at all expanded 

 and the columellar margin flattened, plate-like and polished, 

 resembling that of Taia. In the only fresh specimen examined 

 there are no dark spiral bands and the external surface is highly 

 polished. The operculum is thin and resembles that of Taia. 

 Nothing is known of the radula or soft parts. 



Only two species have as yet been discovered, namely T. 

 incisa (Annandale), found in an apparently subfossil condition in 

 the Chindwin watershed, and T. hhamoensis (Nevill) from north- 

 eastern Burma. The genus may thus be regarded as character- 

 istic of the fauna of Upper Burma. It is apparently related to the 

 Indo-Chinese Chlorostracia, Mabille, but the shell is much less 

 globose and the mouth narrower. 



i For one, the common species in Lake Biwa, Japan, I am proposing a new 

 genus in a paper to be published in the Journal of the Asiatic Society of Bengal. 



^ This specimen is labelled as the type-specimen of Nevill's Palndiria dissi- 

 niilis, subvar. bhamoensis, but the resemblance to the Viviparae dissimiles is 

 quite superficial and the structure of the mouth entirel> different. 



