368 Mr. W. T. Blanford on Georissa, Acmella,form and larger size of the tubes, by the less voluminous in-testine, by the shortness of its loop, and by the darkness andcolour of the liver.XXXV.--On Georissa, Acmella (Cyclostoma tersum, Bens.), Tricula, and Cyathopoma millium, Bens. By WILLIAM T. BLANFORD, F.G.S., C.M.Z.S.DR. v. MARTENS, in the 'Malakoz. Blatter' for 1869*, p. 223,has pointed out that I was in error (Ann. & Mag. Nat. Hist.March 1869, p. 177) in supposing Hydrocena of Parreyss tobe a marine shell, and, consequently, that the only essentialground of distinction between it and my genus Georissa dis-appears. I had overlooked Frauenfeld's mention of the shellin the 'Verhandl. der zool.-bot. Gesellschaft' for 1866 untilafter sending off my note, and at the time of writing wasmainly guided by Martens himself (conf. Malakoz. Blitter,1864, p. 142, and Ann. & Mag. Nat. Hist. 1866, vol. xvii.p. 202) in rejecting Ktister's habitat. 1 fully agree that thereis no further reason for distinguishing the genera, and thatGeorissa sarrita, frustillum, pyxis, Bawesiana, and illexmust be restored to the genus Hydrocena. At the same timeit is very desirable that the animal of L. cattaro�nsis shouldbe reexamined with regard to the position of the eyes and themode of carrying the operculum; and it is only proper to addthat I had myself observed the animal of H. pyxis, Bens., andfound it very similar to I. sarrita as figured by Major Godwin-Austen, and very different from H. cattaro�nsis as figured byKiister. I cannot, however, coincide with Dr. v. Martens in his opi-nion, founded solely on Major Godwin-Austen's drawings, thatCyclostoma tersum, Bens., is anAssiminea; and I am persuadedthat an inspection of the shell would very soon undeceive mycritic. C. tersum possesses a very distinct sculpture, whilstAssiminece are always, so far as I have seen, smooth; andwhereas every species of truc Assiminea, so far as I am aware,is an estuarine shell, living between tide-marks on mud, thelittle shell from the Khasi hills is found, as I am informedby Major Godwin-Austen, in company with Pupa plicidens,in moist places near small streams, but not upon their edges,at a height of 4000 feet above the sea. The only species of Acicula which I possessed for compari-son with C. tersum was A. spectabilis, Rossm., which is similar * But, as is only too frequently the case, published some months after the close of the year.
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