CONTENTS OF THE PLATES. 
PLate I.—Fig. ]. Spirula australis. 2. Octopus cirrhosus. 3. Ar- 
gonauta Argo. 
Pirate I].—Fig. 4. Nautilus umbilicatus. 5. Hyalea globosa. 
6. Pneumodermon diaphanum. 
Piate III.—Fig. 7. Clio borealis; a. ventral aspect; 6. dorsal 
aspect ; c. tunic opened. 7. Intestines. 
Piate IV.—Fig. 8. Cleodora lanceolata, with its shell. 9. Cym- 
bulia Peronii. 10. Helix Cepa, back and front. 
PLaTE V.—Fig. 11. Achatina fasciata. Fig. 12. Limnea octan- 
fracta, of the natural size, and with the oral surface magnified. 
13. Segmentina lineata; 6. natural size; a. c. magnified. 
Pirate VI.—Fig. 14. Auricula Myde. 15. Ampullaria virescens. 
16. Testacilla Maugii, a. b. aspects of the shell. 17. Testacilla 
haliotoidea, a. b. aspects of the shell. Achatina purpurea. 
PiaTe VII.—Fig. 18. Planorbis nitidus; 6. natural size ; a. c. mag- 
nified. 18. d. Segmentina lineata. 19. Ancylus lacustris. 
2. Scyllea pelagica. 21. Tritonia Hombergii. 
Piate VIII.—Fig. 22.—Glaucus radiatus. 23. Dolabella Rhum- 
phii shell. 24. Chiton squamosus. 
Pirate 1X.—Fig, 25. Fissurella annulata. 26. Parmophorus aus- 
tralis. 27. Bulla aperta, with the shell. 
Pirate X.—Fig. 28. Trochus Pagodus. 29. Turbo rugosus. 
30. Natica plicata. 31. Velutina levigata. 32. Delphinula cal- 
ear. 83. Delphinula Lima. 34. Scalaria pretiosa. 
