Mollusks. 2743 



Helix hybrida. Twenty specimens or more from a hedge near New Catton 

 Church, in the autumn of 1847. 



Helix nemoralis. Abundant. 



Helix arbustorum. By ditch sides, common ; the white variety not infrequent. 



Helix Lapicida. I insert this on the strength of several shells having been found 

 near Bramerton : these, although empty, had to all appearance not been long unte- 

 nanted. I have no doubt that a closer examination of the woods in that neighbourhood 

 will afford living specimens, especially as it is found in the adjoining county of Suffolk. 



Helix pulchella. Among sand and earth at the roots of grass and moss, common. 



Helix costata of Miiller, or crenella of Brown. Equally common with the pre- 

 ceding, and both generally found together. There appears to be no doubt of these 

 being the same species, the folds of the periostraca in the one case being rubbed off, 

 the remains of which may often be detected in the sutures of the smooth shell seen 

 under a microscope. 



Helix cantiana. Abundant in many localities among nettles. 



Helix fulva. In woods, among dead leaves ; most abundant at Whitlingham. 



Helix aculeata. Sparingly, Arminghall and Caistor Woods, at the roots of moss. 



Helix granulata. Osier grounds and damp woods. 



Helix sericea. In Whitlingham Wood, on the trunks of trees. 



Helix hispidu. Common, among nettles and under stones and wood. 



Helix concinna. With the above. 



Helix rufescens. Not common. 



Helix virgata. I have never met with this nearer than Swaffham, where it was 

 plentiful about the Station last autumn. 



Helix caperata. Occasionally abundant on the banks under hedges, in almost 

 every lane near the city. 



Helix ericetorum. Common in similar localities. 



Zonites radiatus. Common under stones, timber, &c. 



Zonites pygmceus. Rare under moss; abundant with the Pupa marginata in 

 Mackie's sand-pit. 



Zonites alliarius. Of this I have but one specimen. 



Zonites cellarius. Very common in woods, at the roots of moss and under leaves. 



Zonites nitidulus and radiatulus. Common in similar situations. 



Zonites lucidus. Rare. 



Zonites crystallinus. In damp woods, frequent ; plentiful in the sand-pit. 



Succinea putris and Pfeifferi. Common by ditch sides. 



Bulimus obscurus. Whitlingham Wood, on the trunks of trees. 



TJuu lubrica. Common among moss. 



Pupa umbilicata. Rare, Weston's Wood, Dereham Road. 



Pupa marginata. Abundant in one small spot at Mackie's sand-pit, at the roots 

 of moss. 



Vertigo edentula. Near Mangreen Hall, on the under-side of fern-leaves. I 

 have never found it on any other than the fronds of the Filix-mas. 



Vertigo pygmma. Rare, at the roots of moss. 



Vertigo alpestris. Found sparingly with the Pupa marginata, as above. 



Balcea perversa. Fourteen specimens, from a wall in Thorpe, beneath ivy. 



Clausilia bidens. Whitlingham Wood, abundantly on the trunks of elder trees ; 

 several other woods sparingly. 



