new Species of Land- Shells. 195 



described as a Avhite shell, and no mention is made of the 

 beautiful concentric strige on the under surface, nor is 

 the dullness of the upper side referred to in contrast to the 

 glossy base. 



Hemiplecta Jansoni. 



Testa orbicularis, carinata, perforata, snpra rufo-fusca, vix iiitida, 

 incrementi lineis striata, striisque minutis costulatis raicroscopice 

 sculpta, infra medium versus sensim pallidior, subnitens, striis 

 incrementi tenuibus sculpta, aliisque concentriois prajsertim circa 

 umbilicum eoncinne ornata ; spira valde depressa, conoidea, 

 planata ; anfractus ;>, supra fere plani, supra suturam sub- 

 depressi, iiltimus acute carinatus, baud descendens, supra sulcis 

 2-3 spiralibus, fere obsoletis, inconspicue impressus ; apertura 

 obliqua, angulatim hinata, purpureo-fusca ; peristoma tenue, ad 

 marginem pallidum, marginibus remotis, coluraellari leviter iii- 

 crassato, ad iusertionem breviter expanso et reflexo. 



Diam. maj. 35 mm., miu. 28. Apertura 19 longa, 14 alta. 



Hab. British New Guinea. 



Nanina Cairni, Smith (Ann.& Mag. Nat. Hist. 1887, vol. ix. 

 p. 417, pi. XV. fig. 5), is closely related to the present species. 

 The latter has a flatter, more depressed spire, a sharper 

 peripheral keel^ and sti'onger concentric spiral striae on the 

 lower surface. Owing to the depression of the spire, the 

 form of the aperture is different. Named after j\Ir. Oliver 

 Janson, through whose agency the Museum was fortunate in 

 obtaining this and the other interesting species described 

 in the present paper. 



Hemiplecta ovgarrana. 



Testa parva, anguste perforata, orbicularis, supra subplana, fusca, 

 infra pallidior, umbilicum versus albida; anfractus 5 -S^, leute 

 accrescentes, fere plani, ad suturam filo-carinati, minute obIi(pie 

 costulato-striati, quasi sericati, ultimus ad peripheriam acute et 

 compresse carinatus, hand descendens, infra politus, incrementi 

 lineis tenuibus striatus ; apertura obli(]ua, angulatim lunata, 

 intus lilacea ; peristoma tenue, pallidum, marginibus remotis, 

 columellari ad. insertionem breviter expanse et retlexo. 



Diam. maj. 22-5 mm., min. 20, alt. 10-5. Apertura 11-5 longa, 

 7'o alta. 



Hah. British New Guinea. 



Distinguished by its small size, flattened spire, carinatc 

 snture, and very small perforation. AVithin the aperture 

 and near the peristome there is a slight shelly thickening 

 which is peculiar. 



