338 DR.. O. K. VON MOELLENDORFF ON [JuilC 2, 



parum stritihdi, supremi spirant concave turrito-conicam, apice 

 mamniillari subexcentrico, efficientes, ultimus carina exserta 

 rotundata ad peripheriam, altera ad umhilicum obtusiore, supra 

 et infra carinam pei'iphericam sidco spirali leviter impresso 

 cinctus, a quarta parte solutus, porrechis, leviter ascendens, in 

 parte soluta fere tetragonus, basi spiruliter lineolatus. Apertura 

 fere verticalis, aliquantulum sursum spectans, rotnndato-quad- 

 rangularis, intus dentibus 7 lamelliformibus coarctata, quormn 

 4 majores, ad modum crucis oppositi, parietalis validus longe 

 intrans, bipartitus, inter ilium et columellarein 3 minoribus 

 interpositis. Peristoma liberum, simplex, tenue, sat late ex- 

 pansum, inter binas lamellas profundiuscule sinuatum. 

 Biam. max. 3, alt. 2\, apert. diam. cum perist. 1 mm. 



Hypselostoma bensonianum, v. Molldff. 1. c. p. 306 {nee Blanf.). 



Eab. ad Bukit Pondong leg. cl. R. Hungerford. 



Although I have not yet been able to compare authentic specimens 

 of H. bensonianum, Blfd., from Ava, I am convinced that the Perak 

 tbrm cannot be combined with it, and that it constitutes a good new 

 species. It is somewhat more conical and comparatively higher thau 

 the Ava form, the upper whorls are more convex, not "planulati" 

 as Blanford has it, the last w^horl is more detached and stretches to 

 the right ; facing the shell the whole aperture is visible in H. ben- 

 sonianum, only part of it in H. hung erf ordianum. 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. daynnum, Stol. — Moulmein. 



4. H. hungerf ordianum, v. Molldff. — Perak. 



5. H. trunsitans, v. Molldff. — Samui Island, Gulfof Siam. 



6. H. crossei, Mori. — Tonking. 



7. H. luzonicum,x. Molldff -Luzon. 1 phjij -^^^ isi,,,^^, 

 , var. imbncata, v. Molldtt. — tebu.J '^^ 



The genus is connected by H. transitans with Boysidia, Ancey, 

 a subgenus of Pupa created for P. hunanensis, Gredl., P. stiophostoma, 

 V. Molldff., and others from China, to whicli 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. Clausiliid^. 

 39. Clausilia (Pskudonenia) filicostata, Stol., var. tenui- 

 coi^TA, G. Nevill. 



Clausilia {Pscudonenic) Jilicostula, var. te/ivicostatu, G. Nevill, 



