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. 



1 1 . Leptoconchus striatus. 



12. Sty lifer astericola. 



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



