62 Contributions to Indian Malacology. [No. 1, 



larly descending, the last tumid, rounded beneath. Aperture nearly- 

 vertical, subelliptical, angulate above. Peristome thin, straight, mar- 

 gins united by thin callus, columellar margin narrowly expanded. 



The operculum of this peculiar species was unfortunately lost, and 

 the animal was not observed. In the hurry of travelling, the speci- 

 mens were placed in a box and forgotten, until the fleshy portions 

 were too much decayed for examination. About half a dozen individuals 

 were found under stones in the Myittaya creek, in the same place which 

 yielded Iravadia ornata and other forms. 



Mr. A. Adams, who very kindly aided me in determining some of the 

 species contained in my Pegu collections, suggested that this shell 

 might possibly be a second species of the genus Larina, established by 

 him for an Australian shell, the animal of which also is unknown. In 

 appearance this shell somewhat resembles a Lymnea. It is not impos- 

 sible that it may have affinities with Amphibola. I have a distinct 

 impression that the shells possessed a horny operculum, or I should 

 have been disposed to class them in the Velutinidce. 



Family TECTURIDJE. 

 No. 22, Tectura fluviatilis, n. sp. PI. II, fig. 2, 3, 4. 



Testa depresso-conica, rotundato-ovalis, tenuis, epidermide fusco- 

 olivaced induta, lineis radiantibus, striisque confertis minutis concentri- 

 cis decussaia, intus ccerideo albida, interdum fascia concentricd lacted } 

 vel etiam omnino hoc colore versus marginem saturata, ad apicem 

 ferruginea. Apex subcentralis, erosa. 

 Major diam. 21J min. 20 alt. 6 

 ,, 20 ,, 17 ,, Og 



14 „ 12 „ 4 



Shell much depressed, conical, subcircularly oval, thin, covered with 

 a very dark olive epidermis, always eroded at the apex, marked with 

 fine radiating raised lines and with close and minute concentric stria? 

 of growth ; inside the shell is bluish white, sometimes with one or 

 more milky concentric bands, or the whole interior is milky, except 

 the apex which is invariably ferruginous, the area so coloured having 

 some correspondence to the amount of external erosion, and the 

 colour being evidently due to a deposition of shell inside to protect 

 the animal as the external portion is corroded away. 



This species is found on rocks, rarely on trunks of trees, in many of 



