440 Mr. R. J. L. Guppy on new Species of 



5. Zonites impUcans^ n. sp. 



Testa minuta, discoidea, aperte et late umbilicata, albida, pellucida, 

 nitens ; anfr. 4, depress!, superne applanati, lente accrescentes ; 

 spira applanata ; apertura suborbicularis. 



Alt. I millim., lat. maj. 2; apert. alt. |. 



A minute, discoidal, widely umbilicate, whitish, smooth, 

 shining shell, with four depressed, slowly increasing whorls, 

 flattened above ; spire scarcely, if at all, rising above the last 

 whorl ; aperture suborbicular. 



This is distinguished from Z. umhratilis by the absence of 

 striation, by its planorbiform shape, depressed spire, and wider 

 umbilicus, and by its large sul3orbicular aperture, scarcely 

 encroached upon by the penultimate whorl. 



6. Zonites umhratilis^ n. sp. 



Testa minuta, depressa, profuude ximbilicata, distincte et regulariter 

 striata, diaphana, cornea vel albida; anfr. 5i-6, lente accres- 

 centes; spira convexa, depressa; apertura limaris; peristoma 

 simplex. 



Alt. I millim., lat. 1| ; apert. alt. |. 



A minute, depressed, deeply umbilicate, horn-coloured shell, 

 distinctly and regularly striate ; whorls five and a half or six ; 

 spire convex, depressed ; aperture lunate ; peristome simple. 



This species has a wider and deeper umbilicus than the last, 

 showing all the whorls. Some examples are a good deal more 

 depressed than others, and approach Z. implicans in that re- 

 spect ; but the striation is a definite character. It is possible 

 that these two species may, upon examination of the soft parts, 

 prove not to have caudal appendages, and will then be refer- 

 able to Hyalina^ not to Zonites. 



7. Helix bactricola, n. sp. 



Testa pyramidalis, conoidea, perspective umbihcata, dense radiatim 

 costeUata, corneo-fusca ; anfr. 7, angnsti, lente accrescentes, ul- 

 timus ad peripheriam valde carinatus ; spira conica ; apex laevis, 

 nitens ; apertura angulariter snbovalis, leviter obliqua ; umbilicus 

 infundibuliformis, i latitudinis testae circiter sequans ; peristoma 

 simplex, acutum, margine columellari parum dilatato. 



Alt. 2A millim., lat. 4. 



A small, pyramidal, deeply umbilicate, fuscous-horny Helix, 

 with seven narrow, slowly increasing, closely costellate whorls, 

 the last carinate on the periphery ; spire conic, apex smooth, 

 shining ; umbilicus infundibuliform, about one-third the width 

 of the shell ; peristome simple, acute, columellar margin 

 slightly dilated. 



This little shell is ornamented in a manner similar to //. 



