54 
209. 
211. 
bo 
— 
bo 
213. 
THE MOLLUSCA OF DORSETSHIRE. 
O. plicata (dMont.) 
Brit. Conch., Vol. iv., p. 137. 
Forbes and Hanley, Vol. iii., p. 271, pl. 98, f. 1, 2. 
Under stones and among sea-weed at low water mark. 
Weymouth, Forbes and Hanley ; Portland, £. R. Sykes. 
. O. insculpta (A@ont.) Turbo insculpta, Mont. 
Coralline and deep-sea zones, 
Rarely found alive, usually dead in shell-sand. 
‘‘The incised revolving lines round the lower part of each 
whorl serve to recognize the species.” —Jefreys. 
Weymouth, Damon. 
Fossil: Coralline Crag. 
0. diaphana, Jeffreys. O. obliqua, Alder. 
Inhabits the Coralline zone. 
This very rare shel] is only a line broad and the fifth of an 
inch long ; like O. unidentata it verges on the confines of 
the genus, and approaches Rissoia, 
Weymouth, Damon. 
. 0. decussata (Mont.) 
Inhabits the Coralline zone ; the length is scarcely a line and 
a-half, 
A very rare and local species. Forbes and Hanley assign 
for it only four English localities (of which Salcombe 
Bay, cited by Montagu, is one), three Scotch, and three 
Trish. 
‘Weymouth, Damon. 
TURBONILLA, Risso, 1826. 
T. indistincta (Mont.) Chemnitzia indistineta, 
Forbes and Hanley. 
Ranges from the Laminarian zone to as deep as 40 fathoms. 
Distributed all round the shores of the British Islands and 
ranges to the Mediterranean. 
Weymouth, Damon. 
Fossil: Coralline Crag, and Pleistocene. 
