16 MOLLUSCA OF SOMERSET. 
Mon. scalariforme. 
Gribb Wood, Bratton St. Maur! 
P. ruderata, Studer, a closely allied species with more 
produced spire and without the red-brown freckles of 
P. rotundata is known only in the fossil state in this 
country, but Taylor thinks “it is by no means unlikely 
that isolated colonies may still linger within the limits 
of the British Isles.” 
HELICIDA. 
HELICELLA VIRGATA, Da Costa (= Helix virgata, Da Costa). 
Generally distributed. 
“ Very abundant, especially on dry hills and the sea coast. 
It is very varied in colouring on the sandhills” ; Morman. 
It occurs in a holocene deposit on Brean Down, Weston-super- 
Mare. This species, and H. caperata, secrete themselves at 
the roots of herbage in times of drought. After rain they 
come out to feed, often so quickly and in such enormous num- 
bers as to lead to the supposition amongst ignorant people that 
they came down with the rain. 
Var. subaperta, Jeffreys. 
Bath; Clark. 
Var. carinata, Jeffreys. 
Bratton St. Maur ! 
Var. lineata, Olivi (=v. submaritima, Jeffreys). 
Clevedon ; MceMurtrie. 
Creech Hill, Bruton, and Bratton St. Maur ! 
Bath; Kenneth McKean. 
Sandhills between Weston and Burnham ! 
Var. leucozona, Taylor. 
Bristol; Bristol Mus. Coll. 
Burnham ; Norman. 
Weston-super-Mare; Miss F. M. Hele. 
Quarry on top of Castle Cary Hill! 
Sandhills about Berrow ! 
Var. maculata, Moquin- Tandon. 
Arable fields on Holbrooke Farm, Bratton St. Maur ! 
Burnham ; Norman. 
Var. nigrescens, Grateloup. 
Burnham ; Norman. 
