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 Jncarinata. 



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. 



1 1 . Leptoconchus striatus. 



12. Sty lifer astericola. 



13. The same, in a portion of Star-fish. 



