PLATE VI. 



MONTACUTA. 



Fig. 



1. M. perruginosa, Mont. {My a) — M.oblonga, M. glabra, Tellimya 



elliptica, Erycina f. — S. Devon, Scarborough, Tenby, Cape Clear, 

 etc., Mr. Wedge-shaped, long. 



2. M. bidentata, Mont. (My a.) — Erycina, Peiricola, and Tellimya b. 



— Newcastle, Weymouth, Dublin, etc. Burrows in dead shells, 

 Mr. Short, subquadrate. 



3. M. substriata, Mont. (My a.) — Erycina and Tellimya s. — Devon, 



Tenby, Durham, Zetland, Bantry Bay, etc., on spines of Spatan- 

 gus, deep water, C. Minute, with diverging striae. 



Turtonia. 



4. T. minuta, 0. Fabr. (Venus.) — My a purpurea, etc. — Scarborough, 



Tenby, Cork, Oban, etc., C. 



Kellia. 



B. K. suborbicularis, Mont. (Mya.) — Bornia injlata, Tellina and 

 Tellimya s. — Anglesea, Portland, Zetland, etc., low- water to 60 

 fath., Mr. 



6. K. lactea, Brown, (Tellimya.) — Brit. co. generally. More ob- 



long than K. sub. 



7, 8. K. rubra, Mont. (Cardium.) — Poronia r., etc. — Numerous lo- 



calities ; littoral, C. 



Lepton. 



9. L. squamosum, Mont. — Solen and Lutraria s. — Salcombe Bay, 

 Tenby, Cork, etc., E. Flat, subquadrate. 



10. L. nitidum, Turt. (Kellia.) — Torbay, Skye, E. Less square and 



flat than L. squamosum. 



11. L. convexum, Alder. — Bantry Bay, Er. Convex, granulated. 



12. L. Clarki^e, Clark. — Exmouth, Plymouth, Zetland, Er. Minute, 



oval, smooth. 



13. L. sulcatulum, Jeffr. — Annals, Peb. 1859. Guernsey, Mc. Con- 



centrically wrinkled. 



Galeomma. Adheres to rocks by byssus. 



14. 15. G. Turtoni, Sowb. — Channel Islands, and Exmouth. Oblong, 



gaping. 



Cyclas. Inhabits fresh- water. 



16. C cornea, Linn. (Tellina.) — Sp/iarium c., Scopoli, C. rivalis, etc. 

 — Ponds and ditches everywhere. Equilateral, subquadrate. 



