lamauck's arrangement. 



MOLLUSCA WITH HEADS. 

 NAKED. 



Those M hich swim at liberty. 



Lamarck's Genera. 



1. Sepia. 



2. Loligo. 



3. Octopus. 



4. Lerncea. 



5. Pterotrachea. 



6. Clio. 



Linnsan Genera, Species. 



Sepia officinalis. 



Loligo. 



Octopus. 



Lerncea. 



Pterotrachea. 



Clio. 



Those which creep on the belly. 



7. Laplisia. 



8. Dolabella. 



9. Bullcea. 



10. Tethis. 



11. Lima.v. 



12. Sigaretus. 



13. Onchidium. 



14. Tritonia. 



15. Doris. 



16. PhylMea. 



17. Chiton. 



Laplisia. 



Bulla 



Tethys. 



Lhnax. 



Heli.x 



Onchidium. 



Tritonia. 



Doris. 



Chiton. 



aperta. 



haliotoidea. 



COVERED WITH SHELL. 



One-celled, not spiral, but covering the back of the animal. 



Patella. 

 Fissurella. 

 Emarginula. 

 Concholepas. 

 Crepidula. 

 23. Calyplraa. 



18. 

 19. 

 20. 

 21. 

 22. 



Patella 



testudinaria. 



GrcBca. 



Fissura. 



porcellana. 

 equestris. 



One-celled, spiral, inclosing the animal, with a hollow at the 

 base of the aperture. 



24. Conus. 



25. Cyprcea. 



26. Ovula. 



11. Terebellum. 

 28. Oliva. 



Conus. 



Cyprcea. 



Bulla 



Valuta 



Ovum. 

 Terebellum. 

 porphyria. 



