15. L. flexuosa, Mont. (Tellina.)—Venus sinuosa, Amphidesma flexuosa, L. sinuata; gen. Cryptodon, Axinus, and Ptychina.—Clyde, Bantry, Anglesea, etc., 7 to 80 fath., Mc. Thin, with a fold behind.
16. L. borealis, Linn. (Venus.)—Tellina radula, Lucina r., L. alba.—Many Brit. loc., 1 to 90 fath., C. Lenticular, concentrically laminated.
17. L. leucoma, Turt.—L. lactea, not Linn., Loripes lactea.—Torbay, Scarborough, Bantry Bay, etc., low-water to 80 fath., C. Round, smooth.
18. L. spinifera, Mont. (Venus.)—Myrtea s., L. hiatelloides.—Dartmouth, Plymouth, Hebrides, etc., 8 to 100 fath., M. R. Oval; dorsal margin spinose.
Diplodonta, Mont.
19. T. rotundata, Mont. (Tellina.)—T. undata, Lucina r., D. dilatata.—Dorset, Devon, Tenby, Bantry Bay, etc., 7 to 25 fath., R.
Clausina, Jeffreys.
20. C. ferruginosa, Forbes, (Kellia.)—Skye, Loch Fyne, etc., 30 to 100 fath., C. Concentrically ribbed, minute, oval.
21. C. croulinensis, Jeffreys.—Croulin Island, Shellands, R. Suborbicular.
22. C. abysslicola, Jeffreys.—Not ribbed, R.