154 DR. O. F. VOX MOELLEXDORFF ON [Feb. 20, 



the peristome, the inner yellow or orange lip contrasting with the 

 white outer one, the widening of the peristome to the right, &c, 

 must be analogous according to Pfeiffer's description. 



26. Lagocheilfs liratflfs, sp. nov. (Plate XYI. figs. 25, 26.) 



T. angusie umbilicata, turbinate, sat tenuis, nitidula, transverse 

 subtiliter stricdida, lineis spiircdibus elevatis sat confertis usque 

 ad umbilicum cincta, corneo-flava, obsolete strigata. Anfr. 5^, 

 convexi ; ultimas antice paullum descendens. Apertura sat 

 obliqua, fere circularis ; peristoma suhduplex, tenue, breviter eoc- 

 pansum, baud rejlexum, ad insertionem breviter excisum. 

 Diam. maj. 5, min. 4*25, alt. 5 millim. 



Differs from L. townsendianus, Crosse, of Perak, in the smaller 

 size, the higher and more pointed spii'e, the more convex whorls, 

 the narrower umbilicus, the want of angulation in the last whorl, 

 and the equally distant, uniform spiral lines. 



Fam. DlPLOMMATINIDiE. 



27. Alycjefs roebeleki, sp. nov. (Plate XYI. figs. 20, 21.) 



T. modice umbilicata, subdepresse turbinata, tenuis, pellucida, 

 costulo-siriata, lineis spircdibus microscojneis decussata, lirte 

 jlava ; spira modice elevata, lateribus subconcavis, apiee obtusulo 

 glabrato. Anfractus 5, p>? rc onvexi, ad suturam profundi im- 

 jiressam subplanati ; idtimus postice spiram altitudine ■midti, 

 superans, vedde inflatm, gibber, 4 millim. pone aperturam valde 

 const rictus, turn denuo dilatatus, ad aperturam sat defleccus. 

 Apertura diagonalis, subcircularis ; peristoma continuum, vix 

 duplicatum, sat expansum, baud rejlexum, flavo-lahiatwn. 

 Operculum corneum, valde concavum, anfr. 6. Tubulus suturalis 

 brevis, appressvs. 

 Diam. maj. 9*5, alt. 7 millim. 

 Yar. minor: spira paullo magis elevata. Diam. 8*5, alt. 7 



m illim. 

 Although nearly related to A. peralensis, Crosse, this form must, 

 I think, be separated specifically. It is larger, much less elevated, 

 more widely umbilicated, the last whorl comparatively higher, 

 about four-sevenths of the total altitude, and much more tumid, more 

 deflected at the end, and therefore the plane of the aperture much 

 more oblique, the constriction deeper, the peristome hardly double, 

 not so thick, and yellow instead of white. Besides there is half 

 a whorl less, as I count distinctly 5| in A. perakengis. Unless 

 transitory forms exist in the, as yet, little-explored Malay Peninsula, 

 I think these differences sufficient to consider the Samui race a 

 distinct species. 



28. Alycvefs canalicflatfs, sp. nov. (Plate XYI. figs. 22, 23.) 



T. sat aperte umbilicata, depressa, solidula, confertim coshdata, 

 pallide cornea ; spira parum elevata, convexo-cono.dea. Anfr. 

 3g, conve.ri; idtimus a medio ivjledulus, subgibber, pene apertu- 



