8. 
oblonga. 
Pulteney in Hutch. Dorset. p. 51. t. 18. f. 20.; 8t t. 22," 
eat 
pellucida. 
Descriptive Catalogue of ihe British Testacea. : 233 
vidtilis, and has given some references of P. oblonga, to 
P. lacustris of Linnzus. If the editor of the Systema 
Nature had consulted the Philosophical Transactions, 
this confusion would have been avoided, as the distinc- 
tions between the two species are pointed out, and 
P. oblonga is accurately described by Lightfoot. 
P. testa integerrima, oblonga, compressa, membrana- 
cea; vertice mucronato, reflexo, obliquo. Lightfoot 
in Act. Angl. 76. p. 168. t. 3. f. 1, 2, 3, 5. 
Gualt. Test. t. 4: f. A. A. 
Muller Verm. 2. p. 199. n. 385. _ 
Schrót. Flussconch. t. 5. f. &. a.b. —— 
fa 
Donovan Brit. Shells, t. 150. 
Montagu Test. Brit. p. 484. P. lacustris. 
Habitat in rivis, plantis. aquaticis adherens. 
Testa + poll. longa, 41, lata, tenerrima, colore corneo, sub epidermide Vis 
ridescente. Vertex prope marginem angustierem. 
First noticed as English by Lightfoot, who received 
it from Beaconsfield, in Buckinghamshire. Found in 
ditches, near Deal, by Mr. Boys; at Lackham, and in 
the river Avon, Wilts, by Mr. Montagu; and in the 
river Stour, Dorset, by the Rev. Thomas Rackett. 
ELLE di Integerrime absque vertice mucronato. — : 
P. testa integerrima, obovata, gibba, lucida, radiis 
quatuor ceruleis. Linn. Syst. Nat. n. 716. p. 1260. 
- Linn. Gmel. p. STIT. — 
Lister Conch. t. 543. f. 27. 
Wallace Orkneys, p. 41. 
. Petiver Mus. p. 68. n. 125. 
VOL, VIII. | i n A Daril, 
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