40 
149. 
Var. 
Var. 
151, 
THE MOLLUSCA OF DORSETSHIRE, 
LITTORINIDA. 
LITTORINA, Férussac, 1821. 
L. littorea {Z.) 
Pulteney, p. 49, pl. 17, f. 1. 
“ Proceedings” Dorset Natural Histcry and Antiquarian Field 
Club, Vol. xvi., p. 173. 
Pre-eminently the ‘ Periwinkle ” of our shore. Inhabits the 
belt between tide-marks. 
Mr. Sykes says some of the specimens of this species 
from the Portland Raised Beach show a curious flattening 
of the whorls and a tendency to become keeled ; it may be 
some brackish water affected them, which the occurrence 
of Succinea ublonga suggests. 
Fossil: Raised beach, Portland, Prestwich. Blashenwell, 
Quaternary tufaceous deposit ; Red and Mammaliferous 
Crag. 
. L. rudis (Donovan). 
Pulteney, p. 49, pl. 18, f. 6. 
Inhabits the Littoral zone above, and at, high water-mark. 
“ Proceedings” Dorset Natural History and Antiquarian Field 
Club, Vol. xiii., p. 191. 
Stony and rocky shores, estuaries. 
Viviparous. Jt has the power of maintaining life a con- 
siderable time out of water. 
Mr. Sykes’s paper on monstrosities of this species from the 
Fleet estuary near Langton, 1m the ‘‘ Proceedings” of the 
Dorset Field Club, is worthy of special attention. 
Generally distributed. 
Weymouth, handsomely coloured, FE. R. Sykes. 
patula, Jef. Fleet, Weymouth, brackish water, Z. R. Sykes. 
Swannery, abundant on the silk-weed, J. C. M.-P. 
tenebrosa, Mont. Fleet, £. R. Sykes. 
Fossil: Raised Beach, Portland, Prestwich, E. R. Sykes. 
L. neritoides (Z.) 
Pulteney, p. 49, pl. 18, f. 13. 
Rocks above high-water-mark. 
Generally distributed. 
In immense numbers on the surface of the rocks, at Broad 
Bench west side of Kimmeridge Bay. 
