20. 
cornea. 
. im rivers and Lge T 
Descriptive Catalogue of the British Testacea. 50 
of T. incarnata; but it neither corresponds with Lin- 
 mwus's description “ compresso-planiuscula ;" nor will it 
fall into the subdivision where he has placed that shell. 
T. testa globosa, glabra, colore corneo, sulco transver- 
sali. Linn. Fauna Suecica, n. 2138. Syst. Nat. p. 1120. 
n. (2. Linn. Gmel. p. 3241. 
Lister Anim. Angl..t. 2. f. 31. App. t. 1. f. 5. 
Conch. t. 159. f. 14. | 
 Gualt. Test. t. 7. f. C. 
- D'Argenv. Conch. t. 31. f.9. | 
Pennant. Brit. Zool. 4. t. 49. f. 36. 
Da Costa Brit. Conch. p. 113. t. 13. fi 2. Cardium Nux. 
Muller Verm. p. 202. 'Y.rivalis. odor oiaret 3 
Chemn. Conch. 6. Ti AS. d 133. a. dus € n on 
Maton in Act. Soc. Linn. 3. t. 18. f. 89, 40 
Pulteney in Hutch. Dorset. p. 31. t. 7. f. 2. 
Donovan Brit. Shells, t. 95. 
Montagu Test. Brit. p. 86. Cardium c corneum. 
Lister Anim. Angl. App. p. 22. Riga 
Pulteney in Hutch. Dorset. p. axe Cz amnicum. 
Habitat in rivis et paludibus copiosissima. Incola vivipara. - 
‘Testa magnitudine seminis pisi majoris, sub epidermide ` 'cornei coloris, 
osa; lzevis, valde gibba, latior transversim qua ma cardinibus a an- 
- trorsum uno ies striave EM ante 
First otc s T. ter, who ES mentions the va- 
riety, which is Dr. Pulteney's C.: 'amnicum. Common 
