8 G. and H. Nevill — Descriptions of new Mollusca. [No. 1, 



strigata ; anfractibus 6, convexiusculis, primis duobus vel tribus 

 hevigatis, ceteris transversini costulato striatis, ultimo antice sub- 

 applanato, ad basin acute carinato ; apertura circulari, peristomate 

 albido, incrassato ac refLexo, intus ad basin anguste canaliculato. 

 Operculum normale. 



Long 11, Diam. 4$, Alt. apert. 4, Diam. apert. 3 J m. m. 



This is the smallest species of the genus as yet described, it is 

 also composed of fewer whorls, the last being peculiarly somewhat 

 flattened ; the sculpture is obsolete on the first three, just discerni- 

 ble on the fourth and very distinct on the last two whorls ; the notch 

 at the base of the peristome is less conspicuous than in the other 

 species of the genus ; the shell is of a straw colour, irregularly 

 marbled and streaked with greenish zigzag markings ; the opercu- 

 lum is of a light horny texture composed of about 6 whorls. We 

 have named this interesting new Gataulus after Mr. Nietner of 

 Ceylon, who has so largely contributed to the knowledge of the 

 Insects of that island. 



Helicina Theobaldiana, n. sp., PI. I. Pig. 8, 8a. 



T. parva, depresso-conica, fulvo vel luteo rufescens, sub-obsolete 

 striata ; anfractibus quinis, supra convexiusculis, ultimo ad periphe- 

 riam acute carinato, basi tumido ac la>vigato ; carina luteola ; aper- 

 tura semilunari, paulo obliqua, labro reflexiusculo, paulo dilatato 

 ad peripheriam sub-angulato ; labio calloso, albido ; columella bre- 

 vissima. Operculum tenue, minute et confertim granulatum, pal- 

 lide glaucum, margine paululum fusce-rubro tinctum. Alt. 4 J, 

 Diam. maj. 4 J, D. min. 4 m.m. 



This small species has no peculiar characteristics, it varies from 

 a dark rufous brown to a pale straw colour ; out of some hundred 

 specimens procured, not a single one had the whorls banded. In 

 height it is tolerably constant, 4-4^- m.m., but it varies consider- 

 ably in the breadth, one variety being about 7J, another 6 and a 

 third (the rarest of all) as high as broad ; it somewhat resembles 

 a species from Tonghoo (? crocina Bens, apud Theobald), it 

 can be distinguished by the smoother surface, by the absence of 

 stripes, by the tumidity of the base, and by the greater develope- 

 ment of the callosity. It also is very close to U. Nicobarica, Phil. 



