412 



A. R. Horwood — Molluscan Shell-layers. 



Genera and Species. 



1. 



2. 



3. 



4. 



5. 



6. 



7. 



8. 



9. 

 10. 

 11. 

 12. 

 13. 

 14. 

 15. 

 16. 

 17. 

 18. 

 19. 

 20. 

 21. 

 22. 

 23. 

 24. 

 25. 



26. 

 27. 

 28. 

 29. 

 30. 

 31. 

 32. 



Gasteropoda. 

 Pseudomelania turbinate/, (Stol.) 



Amberleya imbrimta (Sow 



A. undulata (Phill.) 



A. „ (Phill.) • 



A. elegans (Miinst.) 



A. dunkeri (Miinst.) 



A. gaudryana (d'Orb.) . 



Turbo latilabrus (Stol.) 



T. brannoviensis, Wilson 



Trochus northamptonensis, Wilson 



T. thetis, Miinst. 



T. sp. 



T. ariel, Dum. 



T. lineatus, Moore 



T. ziziphinus, Linn. 



T. subexcavatus, S. Wood 



T. adansoni, Payr. 



T. papillosus, Da Costa 



Scalaria foliacea, Sow. 



S. clathratula, Tate 



Chemnitzia blainvillei (Miinst.) 



C. citherella, Tate 



C. intemodula, S. Wood 

 Solarium plicatum, Lam. 

 Capulus sinuosus 

 Natica labellata, Lam. 

 Coplostylus brevis (Sow.) 

 Cerithkim ibex, Tate . 

 C. camertonense, Moore 



33. C. liassicum, Moore 



34. C. ferreum, Tate . 



35. C. confusum, Tate 



36. C. reticulatum, Desl. . 



37. C. subscalariforme, d'Orb, 



38. G. var. spinicostata, Wright MS. 



39. Turritella trigemmata, Tate 



40. Actceonina ilminsterensis, Moore 

 41. 



L AMELLIBRANCHIAT A . 



42. Nucula emarginula 



43. N. variabilis, Sow. 



44. Leda equilatera (Koch & Dunker) 



45. L. galathea (d'Orb.) 



46. Cucullaa munsteri, Ziet. 



Formation. 



Middle Lias 



Lower Lias 



Middle Lias 



Lower Lias 

 Middle Lias 



Coralline Crag 



Eed Crag 

 Coralline Crag 



Lower Lias 



Coralline Crag- 

 Barton Beds 

 Pliocene 

 Barton Beds 

 Headon Series 

 Lower Lias 



Middle Lias 



Lower Lias 

 Middle Lias 



Pliocene 

 Lower Lias 



Chipping Warden 



Pickwell 



Tilton 



Pickwell 



Grimston 



Thorpe Satchville 



Great Dalby 



Old Dalby 



Ingarsby 



Tilton 



Pickwell 



Tilton 



Old Dalby 



Neville Holt 



Tilton 



Chipping Warden 



Bamsholt 



Orford Castle 



Sutton 



Walton-on-Naze 



Sutton 



OldDalby 



Orford Castle 



Barton 



Parma 



Barton 



Hordwell 



Old Dalby 



Tilton 



Old Dalby 



Tilton 



Chipping Warden 



Parma 

 Old Dalby 



Great Dalby 

 Leicester 



