EXPLANATION OF PLATES. 315 



Class, CIEEIPEDES. 

 Order, Sessile Cieeipedes. 



PIG. 



14. Tubicinella Balsenarum. 



15. Coronula Testudinaria. Clieloiiobia, Leach, Astrolepas, Klein. 



16. Balsenaris. Cetopirus, Eanz. 



17. diadema. Diadema, Ranz. 



18. Chthalamus, Eanz. (from Blainville.) 



19. Platylepas pulclira, Leach. One valve separate, showing the 



inside. 



20. Clitia Verruca, Leach. Octhosia, Eanz. Verruca, Schum. 



21. Conia porosa. Teraclita, Schum. 



22. Elminius Leachii. 



23. Catophragmus imbricatus, (from Sowerby's Genera.) 



24. Octomeris angulosus, (from Sow. Gen.) 



25. Balanus tintinnabulum. 



26. Montagui. Acasta, Leach. 



27. galeatus, Conoplsea, Say. 



28. Creusia gregaria. h. showing the internal structure. 



29. Nobia grandis. 



30. Savignium crenatum. ") 



31. Pyrgoma cancellata. 



32. Adna A^gHcum. \ ^^^^S^"^^' ^^'^^- 



33. Megatrema semicostata. j 



Daracia, fig. 489, 490. To be added to this family. 



Order, Pedunculated Cieeipedes. 



34. Lepas anatifer. Pentelasmis Anatifera. 



35. Scalpellum vulgare. 



36. Peronii. (Smilium. Leach.) 



37. Pollicipes polymeus. Eamphidoma, Schum. 

 37*.Pollicipes mitellus. Capitulum, Klein. 



38. Lithotrya Ehodiopus. (Brisnseus.) 



39. Lithotrya dorsalis. Absia, Leach, Litholepas, Bl. 



40. Ibla Cuvieriana. 



41. Psecilasma "Warwickii. Octolasmis, Gray. 



42. Cineras vittatus. 1 ^ 



.c^ r\- r^ • - f Conchoderma. 



43. Otion uuveriri. ) 



