63. 
64. 
65. 
66. 
67. 
THE MOLLUSCA OF DORSETSHIRE. 69 
MODIOLA, Lamarck, 1799. 
Modiola is distinguished from the mussel by its habit of 
burrowing, or spinning a nest of small stones, and fragments 
of shells, by its byssal threads. 
M. modiolus (Z.) 
Generally distributed round the coast from low-water-mark 
to 60 fathoms. 
Fossil: Red and Norwich Crags. 
M. adriatica, Lamarck. M. tulipa, Lamarck. 
Forbes and Hanley, Vol. ii., p. 189, pl. 45, f. 7, and pl. 48, f. 6. 
Portland, West Bay, 15 fathoms, gravel, McAndrew. 
Between South Haven and Studland, J. £. Cooper. 
Swanage, Miss Colson. 
Kimmeridge Bay, Gadcliff, dredged, J. C. M.-P. 
M. barbata, Lamarck. 
Forbes and Hanley, Vol. ii., p. 190, pl. 41, f. 4. 
A rather rare British species, but not uncommon on the 
Dorset coast. 
Dredged off Portland in fifteen fathoms and in Weymouth 
Bay in nine fathoms, McAndrew and Fortes. 
Shore between South Haven and Studland, J. C. J.-P. 
Kimmeridge Bay, frequent, dredged in several depths, 
JoC. AL-P: 
Fossil: Red Crag. 
M. phaseolina, Piilippz. 
Kimmeridge Bay, dredged fifteen fathoms, J. C. M.-P. 
First recorded as a British shell by Mr. Jeffreys in 1847. 
Fossil : Coralline Crag. 
MODIOLARIA, Beck (Lovén). 
M. marmorata (Yorves.) Crenella marmorata, Fortes. 
Mytilus discors, Da Costa. 
Generally distributed round the coast. 
Poole and Swanage Bay, attached to oysters, Pulteney. 
Weymouth, commoa in the tests of ascidians, LE. R. Sykes. 
Kimmeridge Bay, dredged in moderately deep water, usually 
found in the tests of Ascidians, sometimes on the valves of 
Oysters, J. C. M.-P. 
On the shore between South Haven and Studland, J. C. ML. P. 
