118. 
119. 
THE MOLLUSCA OF DORSETSHIRE. 33 
M. costata (Don.) 
Living at low-water-mark of spring-tides ; in many localities 
ranges from five or less to fifty fathoms, inhabiting stony 
and sandy grounds. 
Weymouth, Thompson. 
Fossil: Red and Coralline Crags. Glacial deposit at Widford. 
M. levigata (Philipp). 
Brit. Conch., Vol. iv., p. 386. 
Fossil : Coralline Crag. 
Var. minor, Jeffreys. Length, 0.3; breadth, 0.1 inch. 
120. 
Weymouth, Damon. 
This small variety is found alive at Weymouth, its type form 
being probably extinct in the British Isles ; the locality 
given in Guernsey has been searched several times of 
recent years, but itis believed without success, LE. &. Sykes. 
Fossil: Red Crag. 
M. rufa (Mont.) 
Mont. Test. Brit., p. 263. 
Dorsetshire, Montagu. 
Weymouth, dredged, W. Thompson. Alive on rocks, Z. &. 
Sykes. 
Kimmeridge Bay, dredged, J. C. AL-P. 
Weymouth, dredged, W. Thompson. 
Fossil; Raised Beach, Portland, Z. 2. Sykes. 
. M. turricula (MJont.) 
Pulteney, p. 47, pl. 14, f. 15. 
Weymouth, 7’. Rackett, W. Thompson. 
Fossil: Red Crag. Raised beach, Portland, #. R. Sykes. 
HZEDROPLEURA, Monterosato, 1883. 
. H. septangulare (Mont.) Murex costatus, Pult. 
Pulteney, p. 46, pl. 14, f. 15. 
Forbes and Hanley, Vol. iii, p. 458, pl. 112, f. 6, 7, 
Donovan, Vol. v., pl. 179, f. 4. 
Weymouth, among rocks (dead), S. Hanley; dredged, W. 
Thompson. 
