PLATE VII. 



Unio. Fresh-water Mussel with hinge-teeth. 

 Fig. 



1. U. MAR&AKiTii'ERUS, Li7m. {3Ii/a.) — Alasmodon m., A. arcuafa, V. 



elongata, U. sinuata. — R. Conway ; rivers in Cumberland, Wales, 

 Ireland, etc., Mc. Long, thick, arched. 



2. U. PICTORUM, Limi. (Mj/a.) — U.ovaUs, U. rostrata, U. Utnosus, U. 



Beshai/esii, etc. — Various British rivers, C. Long, oval, not 

 wedge-shaped behind. 



3. U. THMiDUs, Retz. — jl7ya and Unio ovalis, M. depressa, M. ovata, 



Myscei o,, M. solida. — Thames, and various British rivers, C. 

 More solid, deep, and wedge-shaped than U. ^nctorum. 



Anodonta. Fresh- water Mussel, without teeth. 



4. A. CYGNEA, Linn. [Mj/tilus.) — M. anatimis, M. stagnalis, M. pa- 



ludosa, Spnpkonota cy. — Britain and Europe generally, in rivers 

 and canals, C. 



Dreissina, Beneden. 



5. D. POLYMORPHA, Pullas, {3Iy(Mus.) — London Docks, Edinburgh 



Canal, C. 



MoDiOLA, Lamarck. 



6. M. Modiolus, Linn. {Mytilus.) — M. umbiUcatus, 31. ciirius, M. 



vulgaris. — British coasts generally, C. Large, brown, not rayed. 



7. M. OVALIS?, Sowb. — M. tulipa {radiata), var., Brit. Moll., now 



named provisionally. Less tumid, and with longer and more 

 gradually sloped dorsal hue than M. radiata, Rr. 



8. Mt RADIATA, Hanky, Brit. Marine Conch. — M. tulipa, Brit. 



Moll., Mc. Tumid, radiated. 



9. M. BARBATA, Linn. {Mytilus.) — M. Gibbsii. — Jersey, Torbay, Mil- 



ford Haven, Youghal, R. as Brit. Barbs of epidermis serrated. 



10. M. PHASEOLiNA, Bhilippi. — Guernsey, Falmouth, Scotland, Mc. 



Small barbs of epidermis not serrated. 



11. M. CUPREA, Jeffreys, Ann. Nat. Hist. Jan. 1859. — In the stomach 



of a bird shot at Scarborough, Rr. Minute, rhomboidal, smooth. 



Crenella, Brown. 



12. C. NIGRA, Gray, [Modiola.) — Mytilus and Modiola discrepans, de- 



pressa, compressa, discors, — Scotland, R. Broad and compressed 

 behind. 



