EXPLANATION OF THE PLATES. 



Fig 

 1 



2 



6. 



7, 



8, 



9, 



10, 



11, 



Plate 1. 



Chiton squamosus. 

 c. the scaly border. 



Lepas (UHitifcra. 



a. the tentacula of the animal. 



b. the cartilaginous tube. 



The four valves of the operculum 

 of Lepas Tintinnabulum. 



Lepas trachecefonuis. 



Tintinnabulum. 



a. a. the outer valves. 

 h.b. the ianer valves. 



c. the operculum. 



The under side of Lepas Dia- 

 dema. 



A single 

 ti/lus. 

 A. the cell 



valve of Pliolas Dac- 

 at the back of the 



hinge. 



valves of 



The four accessory 

 Phohis Dacti/lus. 



Pholas Daetj/lus, with the acces- 

 sory valves in their places. 



One valve of Mj/a truncata. 



a. the hollow of the tooth where 



the cartilage is fixed. 



b. the truncated end. 



The two valves oi Mi/a Vulsella. 



Plate 2. 



12. Ml/a pictorum 

 13. 



a. the hinge and teeth. 



Solen Vagina. 



a. the cartilage. 



14. Solen sanguinolentus. 



15. Tellina cornea. 



a. the hinge and teeth. 



16. Tellina divaricata. 

 17. radiata. 



18. The two valves of Tellina incequi- 



vahis. 



19. Cardium Unedo. 



20. Mactra lutraria. 



a. the hollow where the carti- 



lage is fixed. 



b. the diverging tooth. 



21. 

 22. 

 23. 

 24. 

 25. 



26, 



27. 

 28. 



Mactra stultorum. 

 Donax Iriis. 



cuneata. 



Venus divaricata. 

 verrucosa ? 



Plate 3. 



Venus Meretrix. 



a. the base. 



b. the upper margin. 



c. the anterior margin. 



d. the posterior margin. 

 Venus imbricata ? 



dejlorata. 



29. Spondj/lus Gaderopus. 



a. the area or triangular space 

 between the hinge and the 

 beak. 



30. Spondj/lus pUcatus. 



31. Chama Gigas. 



32. Hijjpopus. 



33. antiquata. 



34. One valve of Chania Cor. 



35. Chama Lazarus. 



36. The two valves of Area Nucleus. 



