20 THE MOLLUSCA OF DORSETSHIRE. 
HYGROPHILA. 
LIMNAIDA. 
ANCYLUS, Geoffrey, 1767. 
70. A. fluviatilis (A/i7.) Patella lacustris, L. 
Pulteney, p. 58, pl. 22, f. 8. Brit. Conch, Vol. i., p. 102. 
Purbeck Papers, Vol. ii., p, 42. 
On submerged stones and on the under side of water plants. 
East Lulworth, Arish Mill, G. Jeffreys. 
Weymouth, Damon. 
Ulwell Bottom, near St. Alban’s Head, J. H. Austen; 
Godlingston, Swanage, J. C. AL-P. 
Spettisbury, Stour ; Chamberlaynes river, Bere Regis, 
J.C. M.-P. 
Var. capuloides, Jeffreys. Corfe river (very rare), G. Jeffreys. 
Var. gibbosa, Jeffreys. Osmington Mills, G. Jeffreys. 
Var. albida, Jeffreys. Arish Mill, G. Jeffreys. 
71. A. lacustris (Z.) <A. oblongus, Yorbes and Hanley. 
Patella oblonga, Lightfoot. 
Pulteney, p. 58, pl. 18, f. 20, and pl. 22, f. 8. 
Purbeck Papers, Vol. ii., p. 46. 
Similar habits to the preceding. 
On plants in the river Stour, 7. Rackett; Stour, Spettisbury, 
and Chamberlaynes river, J. C. M.-P. 
Corfe River, Swanage, stream, J. H. Austen; Ulwell ; 
Bottom, between St. Alban’s Head and Chapman’s Pool, 
JAC, WEP. 
OTINIDA. 
OTINA, Gray, 1847. 
72. 0. otis, Turton. 
Very local, confines itself to the crevices of rocks, between 
tide-marks. 
Kimmeridge Bay, associated with Laswa rubra and Alexia 
bidentatus, J. C. M.-P. 
