EXPLi^NATION OF PLATES, 



ACCORDING TO THE 



LAMARCKIAN AREANGEMENT. 



Class, ANNELIDES. 



Order, Sedentaeta. 



Fam. Dorsalia. 



FIG. 



1. Siliquaria anguina. Agathirses, Montf. 



Fam. Maldania. 



2. Dentalium octogonum. 



3. Pharetrmm fragile, with tlie outer tube broken. 

 Caecum, fig. 565. To be added to this family. 



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. 



