cover image: Journal of the Asiatic Society of Bengal  Part II  Physical Science  1881

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Journal of the Asiatic Society of Bengal Part II Physical Science 1881

1881

If I understand rightly the distinguished author accounts for the presence of these forms by their introduction from Europe and from consequently Asia before the separation of Africa by the sea in early Tertiary times ; in another passage he suggests the probable submergence of many large islands whose former position is indicated at the present time by the banks and reefs of the Cargados Ch [...] It is scarcely necessary for me to mention that the Mollusca of the Madagascar and Mascarene province give no support to the theory of an ancient emigration from Europe so few fossil landshells of pretertiary times being known ; the entire absence of the genus Helicina from the tetiary deposits of Europe as also from India proper and Ceylon at the present time I consider very significant as [...] Here is Benson's mention of the name in full —" Those (Pterocyclus sp.) which I found were with several specimens of a Cyclostoma a reversed Carocolla and Maeroch/amys ;"—then follows a foot-note —" A new genus of the Hclicidac separated by me from Helix in consequence of the wide departure of the animal from the type of that genus." With this and a mere repetition of the name on page 76 end [...] Benson appears to have sent a paper to the society containing an excellent description of the section with the name Tanych/amys attached ; the editor however changed it to Nanina stating that it had been found to be the same as Gray's genus described a few pages previously ; in the description the editor casually mentions that the form described was the Tanychlamys of Benson MS. [...] This is the common " snail" throughout the plains of the Gangetic Delta quite distinct both as regards shell and animal from its close ally petrosa Hutton the type of which was from Mirzapore and which takes the place of the former in the higher regions of Lower Bengal ; the two species were confused together by Mr.
history
Pages
118
Published in
India
SARF Document ID
sarf.120250
Segment Pages Author Actions
XI.—New or little-known Mollusea of the Indo-Malayan Fauna. By Geoffrey Nevill C. M. Z. S.
125-167 The Natural History Secretary view
XII.—A sketch of the history of the fossils of the Indian Gondwána system. —by Ottokar Feistmantel M. D. Palæontolcyist Geological Survey of India.
168-219 The Natural History Secretary view
XIII.—Additional note on the identifiention of the ancient diamond mines visited by Tavernier.—By V. Ball M. A. F. G. S.
219-223 The Natural History Secretary view
XIV.—List of Diurnal Lepidoptera inhabiting the Nicobar Islands.—By J. Wood-Mason Dcputy Superintendent Indian Muscum Calcutta and Lionel De Nicéville.
224-238 The Natural History Secretary view
Plates
i-iii The Natural History Secretary view

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