1859. j HISLOP FOSSIL SHELLS OF WAGPTJB. 181 



the able Assistant-Secretary of the Geological Society, to whom 1 

 have been deeply indebted on many occasions. 



Corbula Oldhamt, sp. nov. PL X. figs. 02 a, 62 b. 

 C. testa ovato-oblonga, gibbosa, subiequivalvi, postice rotundata, antiee angulato- 



acuminata, transversim tenuiter striata. Long. "5; lat. - 76 unc. 



Kateni, rather rare. This species bears a considerable resemblance 

 to Potamomi/a or 0. ochreata of Hinds, which inhabits streams in 

 Brazil at the present day. Dedicated to Dr. T. Oldham, the eminent 

 superintendent of the Geological Survey of India. 



Cobbttla sulcifera, sp. nov. PI. X. figs. 63 a, 63 6. 

 C. testa valva minore. subtrigona. gibbosissima, transversim profunde sulcata ; 

 margiue ventrali valde et irregulariter arcuato. Long. -87 ; lat. -9 unc. 

 Kateni, rare. 



Shells from the freshwater strata of the Xarbadda Territory. 



Bulimcs Oldhamianus, sp. nov. PI. X. figs. 64 a, 64 b. 

 B. testa ovato-conica, inflata: anfraetibus 6, convexis, sutura satis impres-a 

 separatis; apertura ovata, superne angulata: columella inferne contorta, 

 superne dente sive tubereulo ealloso munita ; labro reflexo. Long. -53; lat. 

 •3 unc. 



Dedicated to Dr. Oldham. 



PismiuM Medlicottiaxcm, sp. nov. PI. X. figs. 65 a, 65 b, 65 r. 

 P. testa parva. ventricosa. suba-quilaterali. concent riee tenuiter striata sulci-^que 

 5 ornata ; natibus prominulis. Long. -12; lat. - 12 unc. 



With this species I have much pleasure in associating the name of 

 the Messrs. Mcdlicott of the Indian Geological Survey. 



The two shells last-described are found in the Xarbadda territory. 

 Correct drawings of them have lately been furnished to me by my 

 friend Dr. Oldham. j'isi</i>>n) Medlicottianvm occurs also at Mekal- 

 gandi Ghat in the Hyderabad territory, whence I obtained a cast 

 somo years ago. 



P.S. — Since the preceding remarks were in type, I have been fa- 

 voured with a proof-sheet of the forthcoming Eteporl of tin' Indian 

 Geological Survey on the Narbaddd District. Dr. ( Hdham takes credit 

 to the Survey for having long since suggested the age of the Maha- 

 dewa Bandstone. The reader, however, will have seen that my view 

 of these beds is Bomewhal different from Dr. Oldham's, as he holds 

 them to be possibly " the equivalent of the Nummulitic limestone* ;" 

 whereas I find them in situ below the Physa-deposit, and therefore 

 they must be at Least as old as the Lower Eocene. That they cannot 



he much older is an inference from the discovery in them of a /'ii/u- 



dina similar to one in the [ntertrappean deposit of Central India. 

 To the opinions of the Survey on this latter rook, while they were 

 unpublished, I did not think it right to allude; but now that they 

 have been given to the world, I must he pardoned for expressing a 

 doubt as to its being, in any part of Central India, of Wealden .i^>\ 



* Mem Qcol Surr. of India, rol. i, p 171 



