Descriptive Catalogue of the British Testacea. 39 
Murray in Amen. Acad. 8. t, 29. f. 6. 
Schröter Flussconch. t. 3. f. 3. & t. À. f. 6. 
: Pennant Brit. Zool. 4. t. 43. £ 17. 
— Da Costa Brit. Conch. p. 228. t. 15. f. 4. 
o AEncyclop. Method. t. 248. f. 4. 
E . i -Pulteney in Hutch. Dorset. p. 27. t.12. f. å M. ovalis. 
Donovan Brit. Shells, t. 89. M. ovalis. 
Montagu Test. Brit. p. 31. M. ovalis. - 
: Halitat in fluviis, frequens. * 
| Testa 14 vel 2 poll. longa, 3 vel 4 lata, epidermide viridescente, oblongo- 
ovata, magis elongata quam M. Batava. 
First described and figured as an English species by 
Lister. 
10, 
ovata. M. testa ovata, antrorsum angustata. 
Lister Anim. Angl. App. f Ax pe T d 
—— Conch € Tap 2? 
Montagu Test. Brit. p. 31. "n p. 563. 
Donovan Brit. Shells, 61239, 4 EX ! 
B Donovan Brit. Shells, t. 101. v.i E 122. i $9. M. de- 
pressa... i, 
Habitat in fluvüs. — 
-Testa 14 poll. longa, aplata, vitidescente-brianes, interdum obsolete ra- - 
T diata, crassiuscula, tumida, Cardout in M. Pictorum, sed prope extremi- 
t postenorem. |  Extremitas altera sales, feré pst. 
B medio depressa, f ni m 
First described and figured by i 
The difference bet his E a and 1 Mya Picto- 
rum was first bes out by Lister, by whom both 
are accurately figured in the same plate, and who ob- 
serves that they are both found i in the same rivers (Ouse, 
Fosse, and Nid, in Yorkshire), a circumstance which 
: - tends to confirm our opinion of their being perfectly 
EET id muere | distinct 
