﻿A L Y C .E U S. 



Plate I. 



Genus ALYC^US. Graij. 

 Testit k-rrenlris, heliciformis ; spira cotiica, sutiira prn. 

 fmiihi; iiltimus avfractiis distortus, medio dnr.fl 

 liniii(hi.<, caJlii rcfnircr^o siituram tegens, jwst 

 niiin/iiiriii iipertiini' cniifractus. Operculum ro- 

 t mill II III i-nriii-inu I'licnii^picac miiltispirale. 

 Shell teri'estriiil, lieliciform ; spire conical, suture 

 deep ; last whorl distorted, tumid at the middle 

 of the back, covering the suture with a retro- 

 versal callus, contracted behind the margin of 

 the aperture. Operculum rounded, horny, in- 

 conspicuously multispii-al. 

 All the AlycKii browse in eastern pastures. A 

 large numerical proportion of the species find their 

 homes in India proper ; but Borneo, Japan, and other 

 eastern lands and islands produce their contingents. 

 The typical species, Ahjccnus gibbus, the first type, 

 belongs to Cochin-China. 



The peculiarities which distinguish the Alycsei 

 from other Cyclostomidfe are very interesting. At 

 first you have a more^or less regular spire of several 

 volutions; then, at the side of the last whorl, farthest 

 removed fnmi the aperture, the spiral tube begins to 

 swell, increasing in volume to about the middle of 

 the back, when it suddeidy contracts, throwing back 

 a narrow callus at the suture. Between this con- 

 traction and the back edge of the aperture, the tube 

 is always narrow, but with various callosities, mouth 

 rings, or other ineijualities till the aperture itself is 

 reached. 



Species 1. (Fig. a, b, Mus. Brit.) 



Alyc^OS crenatds. Ah/. hnUl coiiici, siihrh-i,]!, omnino 

 miriuti' Kti-iata, ultimo aiifnii-tii nJ ,lnrsiiiii mode- 

 rate tiimldo, tiuit valde, brecitrr, cuntr.icto, deinde 

 callo magiw, obliquo ciiicio, ante callum sub- 

 expantio ; callo irtroverso rugoso, albo, mwquali, 

 elongnto ; apertune mnrgine albo, late laqueato ; 

 operculo lata. 



The crenated Altcehs. Shell conical, gi-eenish, all 

 ovei- minutely striated, last whorl moderately 

 tumid at the back, then strongly, briefly, con- 

 tracted, afterwards girt with a large, oblique 

 callus, rather expanded in front of the callus ; 

 retroversal callus rough, white, unequal, long ; 

 aperture white at the margin, broadly fluted ; 

 operculum broad. 



Godwin Austin. Journ. Asi. Soc. Beng. 1871. 



Ilab. Burrail Range, N. Cachar. 



The white, oblique ' collar rufl" and the broadl,> 

 iitt'd margin of the mouth distinguish this species, 

 hich is of small size. 



Species 2. (Mus. Brit.) 



AlYCEUS DIACiONUS. All/. /.•.■/.(■ iiiiniil:!, ji.illide 



'ihli, 



,i,,p„'si.ir:,ii : iiprniii;, rn„m, viar- 

 ijiii.e duplicalo, i-ubcrcnidato, iniihiUm mediocri, 

 liiiHido dorsali haud magiio. 



The diagonal Altc^us. Shell minute, pale chest- 

 nut, smooth, obliquely spiral ; aperture thick, 

 with a double rather crenulated margin ; umbi- 

 licus middle-sized ; dorsal swelling not large. 



Godwin-Austin. Journ. Asi. Soc. Bengal. 1871. 



Hab. Diyung Vallej-, N. Cachai*. 



Species 3. (Mus. Brit.) 



AltCEUS VESTITUS. Aly. testa cnniai, ji.illidr ni^- 

 taiied, anfractibm ail suturam creaiilidis ; iiltimo 

 ad dorsum moderate tumescenti ; aperturd ad 

 aiif factum penultimum emarginatd; margine albo, 

 crasso, svmplici. 



The invested Altc^us. Shell conical, pale chest- 

 nut ; whorls crenulated at the suture, last mode- 

 rately swelling at the back ; aperture emarginated 

 at the penultimate whorl ; margin white, thick, 

 extiis declivi. 



Blasfobd. Journ. Asi. Soc. Bengal, 187J. 



Hub. Aracan Hills. 



Species 4. (Mas. Brit.) 



AltCjEUS GIBBUS. Aly. testd coiiicd, fulvd ; spira hre- 

 viiiscidd, apiici rubro ; ultimo anfractu laieraliter 

 e.rpaiiso, ad dorsum depresso-gibboso, prope aper- 

 turuiii aiigiistixsiino ; callo suturali iuconspicuo ; 

 aperturd rotiiiidd, margine tenulter duplicato ; 

 umbilico brevi. 



The HDNCHBACK Alvc.EUS Shell conical, fulvous ; 

 spire rather short, with red apex ; last whorl 

 laterally expanded, depressed-gibbous at the 

 back, very narrow near the aperture ; sutnral 

 callus inconspicuous ; aperture rounded, margin 

 thinly doubled ; umbilicus short. 



FERIiUSSAr. 



Ilah. Cochin-China. 



