68 Zoological Society, 



grauwack6, the chief portion of which is an argillaceous slate^ cal- 

 careous matter being disseminated in the lowest portion of it, often 

 in sufficient abundance to constitute limestone. 



A paper was afterwards commenced on the physical and geologi- 

 cal structure of the country to the west of the dividing range between 

 Hunter's River (lat. 32° south) and Moreton Bay (lat. ti7° south), 

 with observations on the geology of Moreton Bay and Brisbane 

 River, New South Wales, by Allan Cunningham, Esq., and com- 

 municated by William Henry Fitton, M.D., F.G.S. 



ZOOLOGICAL SOCIETY. 

 [Continued from vol. v. p. 385.] 



August 12. — A Letter was read, addressed to the Secretary by 

 B. H. Hodgson, Esq., Corr. Memb. Z. S., and dated Nepal, Feb- 

 ruary 28, 1834. It related chiefly to the distinguishing characteris- 

 tics between the Ghoral and the Thdr Antelopes, and an abstract of 

 it is published in the Proceedings. 



The exhibition was resumed of the new species of Shells con- 

 tained in the collection formed by Mr. Cuming on the W^estern 

 Coast of South America, and among the Islands of the South Paci- 

 fic Ocean. Those exhibited on the present evening consisted of 

 various species of Anatinida and of the Myidous genus Saxicava : 

 they were accompanied by characters by Mr. G. B. Sowerby, and 

 were named as follows : 



Periploma lenticularis , ?ind planius aula; Anatina prismatica, and 

 costata; IiYONSIA picta, and brevifrons; Saxicava tenuis purpurascens, 

 and solida. 



A collection of land and fresh-water Shells, formed in the Gangetic 

 Provinces of India by W. H. Benson, Esq., of the Bengal Civil 

 Sendee, and presented by that gentleman to the Society, was ex- 

 hibited. It comprised forty species, and was accompanied by a de- 

 scriptive list prepared by the donor, and also by detailed notices of 

 some of the more interesting among them. These notices were 

 read : they are intended by Mr. Benson for publication in the forth- 

 coming No. of the ' Zoological Journal.' 



From the time that he first became acquainted with the animal of 

 a Shell resembling in all respects, except in its superior size, the 

 European Helix lucida, Drap., Mr. Benson regarded it as the type 

 of a new genus of HelicidtB intermediate between Stenopus, Guild., 

 and Helicolimax, Fer. He had prepared a paper on this genus, for 

 which he intended to propose the name of Tanychlamys ; he finds, 

 however, that Mr. Gray has recently described (Lond. and Edin. 

 Phil. Mag. vol, V. p. 379.) the same genus under the name of Nanina. 

 ITie generic characters observed by Mr. Benson are as follows : 

 Nanina, Gray. 

 Testa heliciformis, umbilicata ; peritremate acuto, non reflexo. 



Animal cito repens. Corpus reticulosum, elongatum. Pallium 

 amplum, foramine communi magno perforatum, peritrema amplex- 

 ans ; processubus duobus transverse rugosis (quasi articulatis) 

 omni latere mobilibus instructum, unico prope testae aperturse 

 angulum superiorem exoriente, altero apud peripheriam testae. 



