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 and 
colour of the liver. 
XXXV.— On Georissa, Acmella (Cyclostoma tersum, Bens.), 
Tricula, and Cyathopoma millium, Bens. By WILLIAM 
T. BLANFORD, Y.G.&., C.M.Z.8. 
Dr. v. MARTENS, in the *Malakoz. Blätter’ 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 to 
be a marine shell, and, consequently, that the only essential 
ground of distinction between it and my genus Georissa dis- 
appears. I had overlooked Frauenfeld’s mention of the shell 
in the * Verhandl, der zool.-bot. Gesellschaft’ for 1866 until 
after sending o note, and at the time of writing was 
mainly guided by Martens himself (conf. Malakoz. Blätter, 
1864, p. 142, and Ann ag. Nat. Hist. 1866, vol. xvii. 
I cannot, however, coincide with Dr. v. Martens in his opi- 
nion, founded solely on Major Godwin-Austen's drawings, that 
Cyclostoma tersum, Bens., 1s an Assiminea; and I am persuaded 
that an inspection of the shell would very soon undeceive my 
critic. C. tersum possesses a very distinct sculpture, whilst 
Assiminee are always, so far as I have seen, smooth; and 
whereas every species of true Assiminea, so far as I am aware, 
1s an estuarine shell, living between tide-marks on mud, the 
little shell from the Khasi hills is found, as I am informed 
by Major Godwin-Austen, in company with Pupa plicidens, 
m moist places near small streams, but not upon their edges, 
at a height of 4000 feet above the sea. 
e 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 fi tly the cas ished < ths after 
he ane oa ; cat requently the case, published some mon 
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