MOLLUSCA TESTACEA MARIUM BRITANNICORUM. 
A HISTORY OF THE 
BRITISH MARINE TESTACHOUS MOLLUSCA, 
DISTRIBUTED IN THEIR NATURAL ORDER, 
ON THE 
BASIS OF THE ORGANIZATION OF THE ANIMALS; 
WITH REFERENCES AND NOTES ON 
EVERY BRITISH SPECIES. 
BY 
WILLIAM CLARK. 
LONDON: 
JOHN VAN VOORST, PATERNOSTER ROW. 
M.DCCC.LV. 
