TALUDOMUS. 57 



Subgenus TAN ALIA. 

 Tanaliu, Gray, P. Z. S. 1847, p. lo3; Layard, op. cit. 1854, p. 88. 

 Typk, Ner'ita acidcata, Chemnitz ; Ceylon. 



Jiange. Ceylon. 



Or'Kjhial 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 structui'e of the operculum. 



109. Paludomus (Tanalia) loricata (Iteeve). 



Paludomus {Tanalia) loricata (Reeve), Con. Icon, iv, Palud. ^p. 1. 

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

 Tanalia loricata, L.iyard, P. Z. S. 1854, p. 91. 

 Paludoi)iu>i lai/ardi, Reeve, 1. c. 



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

 pi. 121, fig. 3 as P. U7idata, fig. 5 as P. ccrea, tig. 6 as P. layardi. 



Oriyiiial description : — Shell obovate, spire scarcely exserted, 

 whorls slightly angularly depressed round the upper part, spirally 

 encircled with close-set squamate ridges ; nperture lai'ge ; very 

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

 brown. 



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



Alt. 32-25, diam. 34-5 mm. ( „ „ 1 fj)- 



Hub. In rapids flowing from Adam's Peak, Ceylon {Gardner). 



110. Paludomus (Tanalia) erinacea {Reeve). 



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

 II. & T., C. I. pi. 121, tig. 1 ; NeviU, Hand List, pt. 2, p. 301 

 (as P. {Tanalia) aculeata vav. erinacea). 



Orifjinal description : — Testa obovata, tenuiuscula, anfractibus 

 convexis, liris muricato-squamatis spiraliter cingulatis ; apertura 

 subampla ; atra, intus cajrulesceute, columella et aperture limbo 

 castaneo-nigris. 



The following dimensions are taken from the figure in the 

 ' Conchologia Indica.' 



Alt. 21-5, diam. 21 mm. 



Hah. Mountain streams of Ceylou. 



111. Paludomus (Tanalia) nodulosa {Dohm). 



Paludomus {Tanalia) nodulosa (l)ohni), P. Z. S. 1857, p. 125; 

 II. v'v: T., C. 1. pi. 126, figs. 8, 9; Xevill, Hand List, pt. 2, 

 p. 302 (as P. {T.) aculeata \ai: nodulosa). 



Original description : — Testa oblongo-ovata, la;te olivacea, longi- 

 tudinaliter nigro fulgurata ; spira exserta ; anfractus costis 



