Fig. 



19. P. ATHLETiCA, Bean. — Devon, Northumberland, etc., Cc. Eibs 



toothed. 



20. P. PELLtiCLDA, Linn. — P. Icevis, ccerulea, Acmcea pel. — British co. 



generally, C. smooth. 

 21. var. lavis, Penn. 



ACM^A, or LOTTIA. 



22. A. TESTUDiNALis, Miiller. — P. Clealandi. — North Ire., C. Oval, 



with tortoise-shell markings. 



23. A. VIRGINEA, Miiller. — P. pana, pulchella. — Brit. co. generally, 



Mc. Pale, pink-rayed, shallow. 



PiLiDiuM, or Tectuea. 



24. P. FULVUM, Miiller. — P. Foriesii. — Clyde, Cork, Zetland, etc., R. 



Peopilidium. 



25. P. ANCYLOiBE, Forbes. — Lamlash, Ayrshire, etc., R. 



Dentalidm, Linn. 



26. D. ENTALis, Linn. — Brit. co. generally, C. Smooth, small end 



notched. 



27. D. TARENTiNUM, Lamh. — II. vulgare, striatum, labiatum, politutn, 



Iceve. — South coasts, C. Striated and entire at small end. 



PiLEOPSis, or Capulus. 



28. P. HDNGAKicus, Linn. — Fool's-cap Limpet.— S.Devon, and Br. co. 



generally, C. 



Calypte^^ia, Linn. 



29. C. SINENSIS, Limi. [Patella.) — C. cJdnmisis, albida, lavigata. — S. 



Brit., and Chan. Isls., R. With obhque septum. 



