Calymene Polytoma, Dalman. Europe. Artinura, do. Europe. Sclerops, do. Europe. Schlotheimi, Brown. Europe. Latiferus, do. Europe. Asaphus Cornigerus, Al. Brong. Europe. Caudatus, do. Europe--U. States. Hausmanni, do. Europe--U. States. De Buchii, do. Europe. Brongniartii, Deslongchamps. Europe. Extenuatus, Wahlenberg. Europe. Granulatus, do. Europe. Expansus, do. Europe. Crassicauda, do. Europe. Angustifrons, do. Europe. Heros, Dalman, Europe. Platynotus, do. Europe. Frontalis, do. Europe. Læviceps, do. Europe. Palpebrosus, do. Europe. Sluzeri, do. Europe. Ogygia Guettardii, Al. Brong. Europe. Desmaresti, do. Europe. Wahlenbergii, do. Europe. Sillimani, do. Europe--U. States. Paradoxides Tessini, do. Europe. Spinulosus, do. Europe. Gibbosus, do. Europe. Scaraboides, do. Europe. Hoffii, Goldfuss. Europe. Nileus Armadillo, Dalman. Europe. Glornerinus, do. Europe. Illænus Centaurus, Dalman. Europe. Centrotus, do. Europe. Laticauda, Wahlenberg. Europe--U. States. Ampyx Nasutus, Dalman. Europe. Olenus Bucephalus, Wahlenberg. Europe. Agnostus Pisciformis, Al. Brong. Europe. Isotelus Gigas, De Kay. United States. Planus, do. United States. Genera and Species not fully determined. Trilobites Cephaleurya, Rafinesque, United States. Simla, do. United States. Granulata, do. United States. Bilobites Lunulata, do. United States. Lobata, do. United States. From the short descriptions given by Professor Rafinesque of the five last mentioned fossils, I conclude that they belong to the genus Calymene of Brongniart.