. Mollusca ... Mollusks. ErTHVENIA. 29 Pleatopylis (Sykesia) dathrat,ula, Gude, op. cit. vi, 1899, p. 149. Helix puteolus, Benson, A. M. N. H. ser. 2, xii, 1853, p. 92; Eeeve, Conch. Icon, vii, 1854, pi. 190, fig. 1334. Original description :—" T. late umbilicata, lenticularis, acute carinata, superne liris elevatis (in quovis anfractu 2) et costis distinctis clathrata, parum nitens, corDea; spira parum elevata, obtusiuscula ; anfract. 5 subsequales, vix convexiusculi, ultimus basi radiato-striatus, circa umbilicum subinflatus ; apertura verti- calis, angusta, angulato-lunaris ; perist. s
. Mollusca ... Mollusks. ErTHVENIA. 29 Pleatopylis (Sykesia) dathrat,ula, Gude, op. cit. vi, 1899, p. 149. Helix puteolus, Benson, A. M. N. H. ser. 2, xii, 1853, p. 92; Eeeve, Conch. Icon, vii, 1854, pi. 190, fig. 1334. Original description :—" T. late umbilicata, lenticularis, acute carinata, superne liris elevatis (in quovis anfractu 2) et costis distinctis clathrata, parum nitens, corDea; spira parum elevata, obtusiuscula ; anfract. 5 subsequales, vix convexiusculi, ultimus basi radiato-striatus, circa umbilicum subinflatus ; apertura verti- calis, angusta, angulato-lunaris ; perist. simplex, rectum, acutum. " Diam. maj. 5|, min. 5, alt. 2| ; {Pfeiffer.) Hah. Ceylon: Kandy, Balapiti, Badulla [Blanford, Layard, NevilT); Ambagamuwa (Gollett); Balcadua (Simon). When first described by Pfeiffer the habitat was unknown. Benson, in 1853, described what he thought was a new species under the name of Helix puteolus, from Balcadua, Ceylon. Pfeiffer recorded this name as a synonym of his species (Men. Helic. Viv^. iv, 1859, p. 116) and Benson himself subsequently pointed out the identity of the two (A. M. N. H. ser. 3, v, 1860, p. 247).. Fig. 7.—Stithvenia clathratnla. The parietal armature consists of a single, slightly oblique, vertical plate, which is slightly twisted and a little notched in the middle, and gives off posteriorly aliove an obliquely ascendiug support (see fig. 7 d, which shows the shell «ith part of the outer wall removed). The palatal armature appears to be some- what variable, and consists of various denticles, arranged principally in two horizontal series, midway between the periphery and the umbilicus. In the specimen figured, which is in Mr. Ponsonby's collection, the first series consists of : posteriorly, a short, strong, flattened vertical tooth, and anteriorly, two short, slight, horizontal denticles, separated by a short space ; the second series consists of : posteriorly, a short, flattened, vertical tooth, a little sm
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