ZUA. Leach. A genus described as differing from Bulinus in having a polished epidermis, and a thickened, not reflected lip. Zua lubrica, B. lubricus, Auct. ZURAMA. Leach. A sub-genus of Helix. H. pulchella, Auct. Gray's Turton, p. 41. * * * * * EXPLANATION OF PLATES, AND SYSTEMATIC VIEW OF THE LAMARCKIAN ARRANGEMENT. _Class_, ANNELIDES. _Order_, SEDENTARIA. _Fam._ Dorsalia. FIG. 1. Siliquaria anguina. Agathirses, Montf. _Fam._ Maldania. 2. Dentalium octogonum. 3. Pharetrium fragile, with the outer tube broken. _Fam._ Serpulacea. 4. Serpula bicarinata. 5. Spirorbis Nautiloides, on sea-weed. 6. Galeolaria decumbens, on a Conia. 7. Vermilia triquetra. 8. Spiroglyphus, on a portion of Patella. 9. Magilus antiquus, old shell. Campulotus, Guild. (from Guerin.) 10. The same, in a young state. 11. Leptoconchus striatus. 12. Stylifer astericola. 13. The same, in a portion of Star-fish. _Class_, CIRRIPEDES. _Order_, SESSILE CIRRIPEDES 14. Tubicinella Balænarum. 15. Coronula Testudinaria. Chelonobia, Leach, Astrolepas, Klein. 16. ---- Balænaris. Cetopirus, Ranz. 17. ---- diadema. Diadema, Ranz. 18. Chthalamus, Ranz. (from Blainville.) 19. Platylepas pulchra, Leach. One valve separate, showing the inside. 20. Clitia Verruca, Leach. Octhosia, Ranz. 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, Conoplæa, Say. 28. Creusia gregaria. _b._ showing the internal structure. 29. Nobia grandis. 30. Savignium crenatum. } } 31. Pyrgoma cancellata. } Pyrgoma, Auct. } 32. Adna Anglicum. } } 33. Megatrema semicostata.} _Order_, PEDUNCULATED CIRRIPEDES. 34. Pentelasmis lævis. Antifa, Lam. a. anterior. 35. Scalpellum vulgare. 36. Smilium Peronii. 37. Pollicipes polymeus. Ramphidoma, Schum. 37*. Pollicipes mitellus. Capitulum, Klein. 38. Brismæus Rhophodius. 39. Lithotrya dorsalis. Absia, Leach, Litholepas, Bl. 40. Ibla Cuvieriana. 41. Heptalasmis Warwickii. Octolasmis, Gray. 42. Cineras vittatus. 43. Otion Cuvieri. _Class_, CONCHIFERA. _Order_, C. DIMYARIA. _Fam._ Tubicolaria. 44. Aspergillum vaginiferum. Penicillus, Brug. 45. Clavagella, a fossil species. 46. Teredina personata. 47. Lignite, pierced by Teredinæ. 48. Teredo navalis; _a_, tube (from Sowerby's Genera.) 49. Wood bored by Teredo.