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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.
Oii[/inal clescrij)tion:—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. Paludomiis (Tanalia) loricata (Eeeve).
Paludomus {Tanalia) loricata (Reeve), Con. Icon, iv, Palud. sp. 1.
Paludomus (erea, Reeve, P. Z. S. 1852, p. 128.
Tanalia loricata, Layard, P. Z. S. 1854, p. 91.
Paludomus layardi, Reeve, 1. c.
Paludonius undata, Reeve, Con. Icon, iv, Palud. sp. 2; H. & T., C. I.
pi. 121, fig. 3 as P. undata, fig. 5 as P. area, fig. 6 as P. layardi.
Oriyhial 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 purplebrown.
Alt. 20'5, diam. 20-5 mm. (from original figui-e 1 a).
Alt. 32-25, diam. 34-5 mm. ( „ „ 1 &)•
Mab. 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., 0. I. pi. 121, fig. 1; Nevill, Hand List, pt. 2, p. 301
(as P. (^Tanalia) acideata var. erinacea).
Original description:—Testa obovata, tenuinscula, anfractibus
convexis, liris muricato-squamatis spiraliter cingulatis; apertura
subampla; atra, intus caerulescente, columella et apertures limbo
castaneo-nigris.
The following dimensions are taken from the figure in the
' Oonchologia Indica.'
Alt. 21-5, diam. 21 mm.
Hob. Mountain streams of Ceylon.
111. Paludomus (Tanalia) nodnlosa (Bohm).
Paludomus (Tanalia) nodulosa (Dohrn), P. Z. S. 1857, p. 125;
H. & T., 0. I. pi. 126, figs. 8, 9; Nevill, Hand List, pt. 3,
p. 302 (as P. (T.) aculeata var. nodulosa).
Original description :—Testa oblongo-ovata, Isete olivacea, longitudinaliter
nigro fulgurata; spira exserta; anfractus costis