336. 
Var. 
337, 
338. 
THE MOLLUSCA OF DORSETSHIRE. 87 
T. pullastra (JJont.) 
Pulteney, p. 36, pl. 1, f. 8. 
Forbes and Hanley, Vol. i., p. 36, pl. 1., f. 8. 
A littoral shell, frequents sandy and muddy gravelly ground, 
the tests of Laminaria and the crevices of rocks. 
Poole, #. Forbes, J. C. M.-P. 
Studland sand-banks, Dr. Turner. 
Weymouth, W. Thompson. 
purpurea. Weymouth, Damon. 
Both the typical and distorted forms are common at 
Weymouth ; the latter are not a true variety, H. R. Sykes. 
Fossil: St. Erth beds, doubtful in the Coralline Crag. 
T. decussata (Z.) Cuneus reticulatus, Da Costa. 
Pulteney, p. 36, pl. 6, f. 4. 
Forbes and Hanley, p. 379, pl. 25, f. 1; Da Costa, p. 203. 
A littoral shell rarely if ever taken by the dredge. At 
certain seasons they are seen in great numbers at the 
north shore, Poole Harbour, Pulteney. 
Weymouth, Pulteney. 
Fleet estuary, north side, abundant and fine, Z. 2. Sykes. 
Studland sand-banks, Dr. Turner. 
Poole Harbour, near the mouth, south side. 
Fossil: Crag of Weybourne. 
VENERUPIS, Lamarck. 
V. Irus (Z.) 
Forbes and Hanley, Vol. i., p. 156, pl. 67, f. 1, 2, 3. 
Da Costa, p. 204. 
The lamelle on the surface of the shell distinguish it 
from the rest of the rock-borers of our coasts. 
Da Costa mentions it as a Dorsetshire shell. 
Weymouth, Sandsfoot Castle, embedded in masses of rocks 
on the shore, S. Hanley, E. R. Sykes. 
Weymouth, IV. Thompson. 
Swanage, J. HE. Cooper. 
Kimmeridge Bay, embedded in blocks of cement stone (dead), 
J. C, M—-P. 
Fossil; Coralline Crag. 
