PALUDOMUS. 57. 



Subgenus TANALIA. 



Tanalia, Gray, P. Z. S. 1847, p. 153 ; Layard, op. cit. 1854, p. 88. 

 TYPE, Nerita aculeata, Chemnitz ; Ceylon. 



Range. Ceylon. 



Original description : Animal fluviatile, delighting in the most 

 rapid mountain torrents. Operculum horny, subtriangularly 

 ovate ; apex lateral, lamellated ; nucleus lateral, dextral. 



As in the subgenus Philopotamis, the present subgenus is also 

 based upon the structure of the operculum. 



109. Paludomus (Tanalia) loricata (Reeve}. 



Paludomus (Tanalia) loricata (Reeve), Con. Icon, iv, Palud. sp. 1. 

 Paludomus area, Reeve, P. Z. S. 1852, p. 128. 

 Tanalia loricata, Layard, P. Z. S. 1854, p. 91. 

 Paludomus layardi, Reeve, 1. c. 



Paludomus undata, Reeve, Con. Icon, iv, Palud. sp. 2; H. & T., C. I. 

 pi. 121, fig. 3 as P. undata, tig. 5 as P. area, fig. 6 as P. layardi. 



Original description : Shell obovate, spire scarcely exserted, 

 whorls slightly angularly depressed round the upper part, spirally 

 encircled with close-set squamate ridges; aperture large; very 

 black-brown, interior white, columella and edge of the lip purple- 

 brown. 



Alt. 20*5, diam. 2O5 mm. (from original figure 1 a). 



Alt. 32-25, diam. 34'5 mm. ( 1 6). 



Hal). In rapids flowing from Adam's Peak, Ceylon (Gardner}. 



110. Paludomus (Tanalia) erinacea (Reeve}. 



Paludomus (Tanalia) erinacea (Reeve), P. Z. S. 1852, p. 128; 

 H. & T., C. I. pi. 121, fig. 1 ; Nevill, Hand List, pt. 2, p. 301 

 (as P. (Tanalia} aculeata var. erinacea}. 



Original description: Testa obovata, tenuiuscula, anfractibus 

 convexis, Kris muricato-squamatis spiraliter cingulatis ; apertura 

 subampla ; atra, intus caerulescente, columella et aperturae limbo 

 castaneo-nigris. 



The following dimensions are taken from the figure in the 

 4 Conch ologia Indica.' 



Alt. 21-5, diam. 21 mm. 



Hob. Mountain streams of Ceylon. 



111. Paludomus (Tanalia) nodulosa (Dolirn). 



Paludomus (Tanalia) nodulosa (Dohrn), P. Z. S. 3857, p. 125; 

 H. & T., C. I. pi. 126, figs. 8, 9; Nevill, Hand List, pt. 2, 

 p. 302 (as P. (T.) aculeata var. nodulosa}. 



Original description : Testa oblongo-ovata, laete olivacea, longi- 

 tudinaliter nigro f ulgurata ; spira exserta ; anfractus costis 



