PLATE XIV. 



Fig. 



22. Cardiomorpha modioliformis, King. Cast (natural size) of the left valve, showing 



impression of the ridge behind the anterior adductor 

 muscular impression. Tunstall Hill. 



23. — — Right aspect of a young testiferous specimen. Tunstall 



Hill. 



24. Bakevellia ceratophaga, Schlotheim. Left valve (natural size) of a testiferous 



specimen. Tunstall Hill. 



25. — — Right valve (natural size) of a testiferous specimen. Tun- 



stall Hill. 



26. — — Cardinal view, rather enlarged, of a testiferous specimen, 



showing cartilage-grooves. Tunstall Hill. 



27. — — Right valve (natural size) of a young (testiferous) specimen. 



Tunstall Hill. 



28. Bakevellia antiqua, Miinster. Left valve (natural size) of a smoothed testiferous 



specimen. Tunstall Hill. 



29. — — Right aspect of the same shell. 



30. — — Cardinal view of the same, showing the cartilage pits. 



31. — — Left valve (natural size) of a testiferous specimen marked 



with striae of growth. Tunstall Hill. 



32. — — Left valve (natural size) of a young (testiferous) specimen. 



Tunstall Hill. 



33. — — Cast (natural size) of left valve, showing impressions of 



the anterior adductor muscles {a) ; posterior do. {b) ; 

 and pallial line (c). Humbleton Hill. 



34. — — Enlarged representation of the hinge-plate in gutta percha, 



showing the anterior teeth {a), and posterior do. {b). 

 Original from Tunstall Hill. 



35. Bakevelha tumida, King. Cast (natural size) of the left valve. Humbleton Hill. 



36. — — Cast (natural size) of the right valve, showing impressions 



of the anterior, and posterior adductor muscles, and 

 pallial line. Humbleton Hill. Professor Phillips's 

 specimen. 



37. — — Gutta-percha cast (rather enlarged) of the cardinal region, 



showing the cartilage pits on the area. The original 

 is from Ryhope Field- House Farm. 



38. Bakevelha Sedgwickiana, King. Left valve (natural size) of a testiferous specimen. 



Tunstall Hill. 



39. — — Right valve (natural size) of a testiferous specimen. 



Tunstall Hill. 



40. — — Left valve (natural size) of a testiferous specimen. Tunstall 



Hill. 



41. Bakevellia bicarinata, JTm^. Right valve (natural size) of a testiferous specimen. 



Tunstall Hill. 



42. — — Left valve (natural size) of a testiferous specimen. Tunstall 



Hill. 



