PLATE XIV. 



Fig. 



1. Mytilus squamosus, /. de C. Sow. Right valve (natural size) of a testiferous 



specimen. Tunstall Hill. 



2. — — Dorsal aspect of a testiferous specimen, natural size. 



Tunstall Hill. 



3. — — Left valve of a testiferous specimen, natural size. Tunstall 



HiU. 



4. — — Left valve of a testiferous specimen, natural size. 



Silksworth. 



5. — — Dorsal view of a cast, natural size. Humbleton Hill. 



6. — — Cast ; left valve showing impressions of pallial line, and pos- 



terior adductor muscles. Mr. E. W. Binney's specimen. 



7. — — Dorsal view of the last specimen, showing impressions of 



the posterior adductor muscles [a) ; posterior visceral 

 ditto ib) ; and anterior adductor ditto {c). 



8. Mytilus septifer. King. Right valve of a testiferous (smoothed) specimen, natural 



size. Souterpoint. 



9. — — Left valve (natural size) of a testiferous (smoothed) speci- 



men. Souterpoint. 



10. — — Left valve; young specimen. Cast, rather enlarged. 



Roaker Rocks. 



11. — — Cast ; left valve (natural size) showing impressions of the 



anterior adductor muscle {a) ; posterior ditto {b) ; and 

 pallial line. Byers's Quarry. 



12. — — Ventral view of a cast. Byers's duarry. 



13. — — Cast of the hinge (twice the natural size), showing im- 



pressions of the cartilage grooves. Tunstall Hill. 



14. Edmondia Murchisoniana, X^V^y. Right valve (testiferous), natural size. Tunstall 



Hill. 



15. — — Left valve (natural size) of a testiferous specimen. Tun- 



stall Hill. 



16. — ^ — Cast; natural size; right valve. Humbleton Hill. 



17. — — Dorsal view of the last specimen with the umbones removed, 



to show the pair of subjacent cartilage fulcra {a). 



18. Cardiomorpha modioliformis, Kinc/. Left view of a testiferous specimen, natural 



size. Tunstall Hill. 



19. — — Dorsal view of the same shell. 



20. — — Right valve (natural size) of a smooth variety. Tunstall 



Hill. 



21. — — Left valve (natural size) of an angulated variety. Tunstall 



Hill. 



