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Show 338 DR. O. F. VON MOELLENDORFF ON [June 2, parum striatuli, supremi spiram concave turrito-conicam, apice mammillari subexcentrico, efficientes, ultimas carina exserta rotundata ad peripheriam, altera ad umbilicum obtusiore, supra et infra carinam periphericam sulco spirali leviter impresso cinctus, a quarta parte solutus, porrectus, leviter ascendens, parte soluta fere tetragonus, basi spiraliter lineolatus. Apertura fere verticalis, aliquantulum sursum spectans, rotundato-quad-rangularis, intus dentibus 7 lamelliformibus coarctata, quorum 4 majores, ad modum crucis oppositi, parietalis validus longe intrans, bipartitus, inter ilium et columellarem 3 minoribus interpositis. Peristoma liberum, simplex, tenue, sat late ex-pansum, inter binas lamellas profundiuscu/e sinuatum. Diam. max. 3, alt. 24, apert. diam. cum perist. 1 mm. Hypselostoma bensonianum, v. Molldff. 1. c. p. 306 (nee Blanf). Hab. ad Bukit Pondong leg. cl. R. Hungerford. Although I have not yet been able to compare authentic specimens of //. bensonianum, Blfd., from Ava, I am convinced that the Perak form cannot be combined with it, and that it constitutes a good new species. It is somewhat more conical aud comparatively higher than the Ava form, the upper whorls are more convex, not "planulati" as Blanford has it, the last whorl is more detached and stretches to the right; facing the shell the whole aperture is visible in H. bensonianum, only part of it in H. hungerfordianum. There are seven instead of four teeth. I suppose that the additional fifth tooth mentioned by Blanford means that the parietal tooth or lamella is divided as in the Perak species, but the latter possesses three more between the parietal and columellar lamellae. The following species of Hypselostoma are now known :- 1. H. tubiferum, Bens.-Ava. 2. H. bensonianum, Blfd;--Ava. 3. H. dayanum, Stol.-Moulmein. 4. H. hungerfordianum, v. Molldff.-Perak. 5. H. transitans, v Molldff.-Samui Island, Gulf of Siam. 6. H. crossei, Mori.-Tonking. 7. H. lusonicum, v. Molldff.-Luzon. ) „,.,. . T , . , var. imbricata, v. Mblldff.-Cebu.} Phll)PPlne Islands. The genus is connected by H. transitans with Boysidia, Ancey, a subgenus of Pupa created for P. hunanensis, Gredl., P. sttophostoma, v. Molldff., and others from China, to which I believe some Indian species, as P. palmira, Stol., plicidens, Bens., salwiniana, Theob., likewise belong. Hypselostoma is an extreme development of the Boysidia type. Fam. CLAUSILIIDJE. 39. CLAUSILIA (PSEUDONENIA) FILICOSTATA, Stol., var. TENUI-COSTA, G. Nevill. Clausilia (Pseudonenia) filicostata, xar.Jenuicostata, G. Nevill, |