iM^'^Wi-H. Beiisoii on some new Indian Cyclostomata. 285 



strictus, described in the tenth volume of the ' Annals^' but diiFers 

 in form, sculpture^ and in the position of the sutural callus. The 

 strangulation is less conspicuous than in other species of Alycceus, 

 and the constriction occurs immediately behind the peristome ; 

 hence the sutui-al callus also commences near the aperture in- 

 stead of being remote as in the other species. A brown mark, 

 in the single specimen which has come to hand, occurs at the 

 point where the callus is given off. The callus lying in the 

 suture is also longer than in the orbiculate A. strangulatus, in 

 which it is moderate, or in ^. constrict us, whei-e it is short. The 

 number of whorls in the operculum of A. strangulatus is much 

 greater, and they are more compactly wound than in either 

 A. Urnula or constrict us ; in A. Urnula the sutures are tolerably 

 distinct, and the central whorls are slightly concave ; in ^. con- 

 strictus the sutures are inconspicuous, as originally noted. 



9 f -.- 



i' . 2. Cyclostoina tersum, nobis, n. s. 



Testa subperforata, minuta, ovato-conica, albida, longitudinaliter (ra- 

 diatim) sub lente striis exilissimis eleganter insculpta ; sutura im- 

 pressa, apice obtusiusculo ; anfractibus 5 convexis ; apertura an- 



., gulato-ovata, verticali, tertiam partem testae sequante ; peristomate 

 !i'; simplici, crassiusculo, marginibus callo tenui junctis. 



Diam. 1, long. 2 mill. 



Hab. in muscis arborum ad Musmai, prope Cherra-poonjee. 



This and the following still more minute species I detected in 

 moss which had been gathered in the mountain range which fills 

 the eastern angle of the Birhampooter river, where it flows from 

 the valley of Assam into the plains of Bengal. In the absence 

 of an operculum it is difficult to decide whether it belongs to the 

 subgenus Cyclostomus, to Tudora, or to Leonia, Gray. 



3. Cyclostoma Milium, nobis, n. s. 



Testa aperte umbilicata, minutissima, trochiformis, laevigata, albida, 

 spira conica, sutura profunda, apice obtuso ; anfractibus 4^ con- 

 vexis, ultimo inflato, rotundato ; apertura obliqua, diagonal!, sub- 

 circulari ; peristomate expansiusculo, margine recto acuto, integro, 

 breviter adiiato ; umbilico margine angulato, compressiusculo. 



Long. \\, diam. vix 1 mill. 



Hab. cum prsecedente. 



Possibly belonging to Cyclophorus, near C. coeloconus, nobis. 

 It is the smallest known species, being of less size than C. 

 Cytora, Gray. 



., The climate of Cherra is perhaps not exceeded by any other 

 in moisture, 600 inches of rain having been registered as falling 

 within the seven months of a single rainy season. The range 



