90 
346, 
347. 
THE MOLLUSCA OF DORSETSHIRE. 
SAXICAVIDA. 
SAXICAVA, Bellevue, 1802. 
S. rugosa (Z.) Mytilus rugosus, Penn. 
Pulteney, p. 39, pl. 13, f. 5. 
Forbes and Hanley, Vol. i., p. 146, pl. 6, f. 7, 8. 
In the young state it gapes at the superior margin. 
Successive generations will occupy the same hole. The 
last inhabits the place of its predecessor. In this way 
two or three pairs of shells are found nested one within 
the other. 
Burrows in limestones and crevices of rocks, roots of sea- 
weed, &e. 
Found lodged in caleareous rocks at Weymouth and Portland, 
Pulteney. 
Weymouth, dredged as well as found on the beach in 
detached portions of limestone, S. Hanley. 
Portland, West Bay, dredged alive in 20 fathoms, EZ. Forbes 
and McAndrew. 
Lyme Regis, dredged, J. W. Cundali. 
Swanage, J. EL. Cooper. 
Kimmeridge Bay, in blocks of Kimmeridge clay, dredged 
various depths, not uncommon, J. C. J.-P. 
Raised beach, Portland, Prestwich. 
Fossil : Miocene ; Coralline and Red Crags. 
SOLENIDA. 
Their process of locomotion is not limited to burrowing, 
they can dart from place to place in the water as quickly 
as a scallop and apparently in the same way. 
SOLECURTUS, Divile., 1824. 
S. antiquatus (Pult.) S. coarctatus, /. and H. non. Gmel, 
Solen antiquatus, Pulteney. 
Forbes and Hanley, Vol. i., p. 259, pl. 15, f. 3. 
Pulteney, pl. 29. 
Portland, West Bay, Z. Forbes and McAndrew. 
Weymouth, thrown up on the beach, Z. 2. Sykes. 
