440 Mr. R. J. L. Guppy on new Species of 
5. Zonites implicans, n. sp. 
Testa minuta, discoidea, aperte et late umbilicata, albida, pellucida, 
nitens; anfr. 4, depressi, superne applanati, lente accrescentes ; 
spira applanata; apertura suborbicularis, 
Alt. 4 millim., lat. maj. 2; apert. alt. 3. 
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 7. wmbratilis by the absence of 
striation, by its planorbiform shape, depressed spire, and wider 
umbilicus, and by its large suborbicular aperture, scarcely 
encroached upon by the penultimate whorl. 
6. Zonites umbratilis, n. sp. 
Testa minuta, depressa, profunde umbilicata, distincte et regulariter 
striata, diaphana, cornea vel albida; anfr. 54-6, lente accres- 
centes; spira convexa, depressa; apertura lunaris; peristoma 
simplex. 
Alt. # millim., lat. 13; apert. alt. 3. 
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. ¢mplicans 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 umbilicata, dense radiatim 
costellata, corneo-fusca; anfr. 7, angusti, lente accrescentes, ul- 
timus ad peripheriam valde carinatus; spira conica; apex levis, 
nitens ; apertura angulariter subovalis, leviter obliqua ; umbilicus 
infundibuliformis, 4 latitudinis teste circiter equans; peristoma 
simplex, acutum, margine columellari parum dilatato. 
Alt. 23 millim., lat. 4. 
A small, pyramidal, deeply umbilicate, fuscous-horny Heliz, 
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. 
his little shell is ornamented in a manner similar to H. 
So ge ee es 
