:mollusi'A op ixdja. 345 



4 convexi, ulllmns a medio tumidns, basi r/ibbtn^, turn valde con- 

 strictus, post stricturam crista valde elevata, cinctxs. Ajyertura 

 modice ohliqua, subcircidaris, peristoma extiis sat expansum valde 

 iiicrassatum, qunsi inidtij)hcatum, intus porrectum, vix expansuin, ad 

 inaertionem et basi sinnatiim, sat excisum. 

 " Diam. 2-8 ; alt. 2-2 mill. 



"Hab. in raontibus Darjilinglnclise. Coram, CLE. Hungerford." 

 This was evidentlj- a MS. name of Nevill's. See his Hand-list, 

 p. 291, no. 11, Ah/ca'us, n. sp. (prox. A. humilis), 20 Darjiling, 

 coll. Dr. F. Stoliczka. In Nevill's own copj- he has entered 

 Col. Mainwaring also. These were not included among the Alycasi 

 sent to me by Dr. Annandale, but specimens from Cachar (?) 

 c. Dr. F. Stoliczka, were sent, and these I determined to be A. nong- 

 tungensis mihi. 



Subgenus Dioryx, Benson. 



A. M. T^. H. March 1859, p. 177, for original description. 

 Moll. Ind. vol. i. p. 187. 



Alyo^us (Diorxx) ttrnula, Bs. (Plate CLIII. figs. 1,1a.) 



Specimen figured, No. 40 Blf. Coll., llungun Valley, the typical 

 locality. 



Benson, A. M. N. H. ser. 2, vol. xi. 1853, p. 284. 



Original description : — *' Testa rimata, vix px^'^'orata, rjluboso- 

 conica, laevigata, S07xlide albida, apice obtusiuscido,rubescente, sulura 

 impressa, calliim gerente ; anfractihus 3| convexis, idtimo ventricofO, 

 exilissime radiato-striato, pone apertnram breviter constrictiiisculo, 

 proxime tubam retroversam, suturalem, elongatam, emittente ; ajjer- 

 tura circuluri verticali integra, peristomate incrassato, sid)d,uplicato, 

 expanse, sidir/'Jlexo, breviter adnata; op>ercido apertnram cequante, 

 pdaiiato, anfractihus mediocribus, subconspticuis. 



"Diam. 31, alt. 4| mill. 



" Hab. Ad Darjiling Himalayanum. Testa Dom. R. Trotter." 



" This interesting species inhabits the same locality as A. con- 

 strictus, described in the tenth volume of the ' Annals,' but difl'ers in 

 form and 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 sutural callus also commences near the aperture instead 

 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. strangnlatus, in which it is 

 moderate, or in A. constrictus, where it is short. The number of 

 whorls in the oi)erculnm of A. strangidatus is much greater, and 

 they are more compactly wound than in either A. urmila or con- 

 strictus ; in A. urnula the sutures are tolerably distinct, and the 

 central whorls are slightly concave ; in A. constrictus, the sutures 

 are inconspicuous, as originally noted." 



2f2 



