PLATE LI. 



^i«- Page. 



1. Eissoa membra7iacea (A. Adams). Belfast, Estuariiie Clays. (Hariiier Collectiou) . 625 



2. Ditto, var. lahiosa (Montagu). Belfast, Estuarine Clays. (Harmer Collection) . 626 



3. Ditto, ditto. Belfast, Estuarine Clays. (Harmer Collection) . . . 626 



4. Rissoa alata, Philippi. Belfast, Estuarine Clays. (Harmer Collection) . . 626 



5. Rissoa dissimilig, sp. nov. St. Erth. (British Museum) .... 630 



6. Ditto. St. Erth. (Cambridge Museum) ..... 630 



7. Rissoa lineolata, Michaud. St. Erth. (British Museum) .... 628 



8. Rissoa {Persephona) violacea, Desmai-est. St. Erth. (Belfast Museum) . . 636 

 y. Rissoa Guerini, Reeluz. Selsey. (York Museum) .... 629 



10. Ditto. St. Erth. (British Museum) . . . . . .629 



11. Rissoa parva. ij)-ci Qosia). St. Erth. (British Museum) .... 630 



12. Ditto. Belfast, Estuarine Clays. (Harmer Collection) .... 630 



13. Ditto, var. interrupta (A. Adams). St. Erth. (British Museum) . . . 631 



14. Rissoa veimsta, Philii>pi. Selsey. (Harmer Collection) .... 627 



15. Rissoa hasi-sulcata, Etheridge and Bell. St. Erth. (British Museum) . 635 



16. Rissoa seniicostata (S. Woodward). Bramerton. (Harmer Collection) . . 634 



17. Ditto. Butley. (Harmer Collection) ...... 634 



18. Alvania Wyville-Thomsoni (Jeffreys). Bridlington. (Headley Collectiou). . . 610 



19. Alvania suhperforata (Jeffreys). Bridlington. (Headley Collection) . . . 616 



20. Alvania texfiliformis, A. Bell, MS. St. Erth. (British Museum) . . .617 



21. Ditto. St. Erth. (British Museum). . . . . . .617 



22. Alvania densicostata (Etheridge and Bell). St. Erth. (British Museum) . . 611 



23. Alvania, Bellii, sp. nov. St. Erth. (British Museum) . . . .611 



24. Alvania curta, Dujardin. St. Erth. (British Museum) .... 611 



25. Ditto. St. Erth. (Cambridge Museum) . . . .611 



26. Alvania partim-cancellata {B.Y.^yood, MS.). St. Erth. (British Museum) . . 612 



27. Ditto. St. Erth. (Harmer Collection) . . . .612 



28. Alvania oheliscus (Etheridge and Bell, MS.). St. Erth. (British Museum) . . 613 



29. Alvania ereda, A. Bell, MS. St. Erth. (Britisli Museuuj) . . . .613 



30. Alvania Enysii (A. Bell). St. Erth. (Cambridge Museum) .... 614 



31. Alvania dubiosa, Etheridge and Bell, MS. St. Erth. (British Museum) . . 614 



32. Alvania jjundnra {Montagu). Portrush. (York Museum) .... 615 



33. Alvania multistriafa (A. Bell). Selsey. (York Museum) .... 616 



34. Cinyula jjentodonta {S. V.Wood, Jr.). St. Erth. (Harmer Collection) . . 637 



35. Ditto, var. jj/cte (Etheridge and Bell). St. Erth. (British Museum) . . 638 



36. Ditto, var. rigida (Etheridge and Bell). St. Erth. (British Museum) . . 638 



37. Cingida hicarinata, A. Bell. Selsey. (York Museum) .... 640 



38. Cingula cingillus (Montagu). St. Erth. (British Museum) .... 640 



39. Rissoa inconspicua, Alder. St. Erth. (British Museum) .... 633 



40. Rissoa scutula, A. Bell. Selsey. (York Museum) . . . • 635 



41. Ceratia proxima (Alder, MS.). Garvel Park. (Harmer Collectiou) . . . 644 



42. Onoba striata (J. Adams). St. Erth. (British Museum) . . . .641 



43. Oiioba acidens (Gould). Garvel Park. (Harmer Collection) . . . 643 



44. Cingula conidoidea (Etheridge and Bell). St. Erth. (Britisli Museum) . . 638 



45. Cingula substriata (Philippi). St. Erth. (British Museum) . . . 638 



46. Cingula semistriata (Montagu). Selsey. (York Museum) .... 639 



47. Barleeia cingidata, A. Bell. Selsey. (Harmer Collection) .... 645 



