804 MR. G. F. ANGAS ON HELIX SEPULCHRALIS. [NoV. 20, 



Secondly, Helix subsepulchralis, Crosse (Plate LXXX. fig. 3.). 

 Shell much smaller and more solid ; spire conical ; whorls with the 

 concentric depression and coarse plication absent ; colour dark chest- 

 nut, with a narrow white band at the periphery and a broader one at 

 the base; umbilicus more contracted, and non-perspective ; umbihcal 

 region invariably of a dark colour ; whilst the brown colouring shows 

 on the interior of the lip. This is the shell figured by Reeve as H. 

 sepulchralis, var. b. 



Thirdly, I will briefly diagnose the shell figured as var. c. This 

 appears, on the examination of many specimens, quite distinct from 

 the H. subsepulchralis of Crosse. The shell is about the same size, 

 but less conical ; the umbilicus is more contracted ; there is a faint 

 development of the depression on the upper part of the last whorl ; 

 the painting invariably consists of three broad chestnut zones on a 

 pale yellowish-olive ground ; and the umbilical region is constantly of 

 a light colour. For this species I propose the name of H. hova. 



Fourthly comes another shell, equally distinct, somewhat larger than 

 the last two, but never attaining the size of the true sepulchralis, 

 from which it differs also in form, being less flattened and more com- 

 pact ; it wants tlie oblique plications, but has the concentric depres- 

 sion strongly developed, the lower edge of it being bounded by a pro- 

 minent elevated keel ; the base is very tumid in front, and forms a 

 kind of abrupt carina bordering the pinched and contracted umbili- 

 cus. The colouring varies from dark chocolate-brown to pale green, 

 banded with brown zones, whilst the umbilicus is almost invariably 

 encircled by a light or dark band, sometimes by both. One marked 

 character of this species is the freckled, diaphanous, more or less zig- 

 zag ornamentation of the epidermis, which gives to the shell a beauti- 

 ful appearance, and is never discernible in H. sepulchralis. The 

 species, of which there is a bad figure in F^russac (pi. 75 c. figs. 6, 

 7), I propose to call Helix sakulava. 



Helix hova, n. sp. (Plate LXXX. figs. 4, 5.) 



Shell moderately umbilicated, depressedly conical, rather solid, 

 under the lens extremely finely shagreened, greenish yellow with three 

 broad chestnut bands ; whorls 4 J, rather convex, the depression on 

 the upper surface of the last whorl very slight; base rounded, with 

 a moderate excavation round the umbilicus, which is somewhat con- 

 tracted and non-perspective; aperture oblique, quadrately ovate, 

 white within ; outer lip moderately expanded and reflexed, pure 

 white ; margin joined by a thick white callus. 



Dinm. maj. 1 in. 5 lines, min. 1 in., alt. 10 lines. 



Hab. Madagascar. 



Helix sakalava, n. sp. (Plate LXXX. figs. 6-tl.) 



Shell umbilicated, orbicular, moderately solid, very minutely irre- 

 gularly granulated above and below, chestnut, with a pale band sur- 

 rounding the umbilical region, and more or less freckled throughout 

 with angular or zigzag ochraceous diaphanous markings ; spire very 

 slightly raised, apex obtuse ; whorls 4^, rapidly increasing, the last 



