a. _Palmacites_, containing fifteen species. b. _Casuarinites_, " five. c. _Calamites_, " ten. d. _Filicites_, " twenty-three. e. _Lycopodiolithes_, " five. f. _Poacites_, " four. In the whole sixty-two species. 4. Carpolithes.--Of which he enumerates fifteen species as present in his collection. This division is considered as a genus, as is also the next. 5. Anthotypolithes.--The cabinet contains only one species, namely the _Anthotypolithes ranunculiformis_." * * * * * In 1820, Gaspard Count Sternberg published in German, the first number of a work which has been translated by the Comte de Bray, under the title of "Essai d'un Exposé Geognostico-Botanique de la Flore du Monde Primitif." Of this translation a second and third part appeared in 1823 and 1824. In these successive numbers the Count has communicated the state of his knowledge as it grew up under his hands, in consequence of his own labours and those of his friend, Baron Schlotheim. The genera, as they are successively developed in the work, are the following:-- 1. _Lepidodendron._--Stem scaly; the scales leaf-bearing, surrounding the stem spirally. In a subsequent number, what are here called scales, are denominated scale-like cicatrices. This genus is subdivided in the first number into two sub-genera, but this division is not noticed in the additional species quoted in the succeeding numbers. _Lepidotæ._--Scales convex. _Alveolariæ._--Scales sub-concave. 2. _Variolariæ._--Stem shield-bearing, or warty; shields leaf-bearing, surrounding the stem spirally. 3. _Calamitæ._--Stem striated, intercepted with sutures at the articulations. 4. _Syringodendron._--Stem arborescent, in the form of pipes agglutinated together, with naked glandules surrounding the stem spirally. In the second number the following genera are given:-- 5. _Rhytidolepis._--Stem arborescent, streaked longitudinally with elevated wrinkles; shields surrounding the stem spirally. 6. _Flabellaria._--Leaves part stalked, divided and expanded like a fan. 7. _Schlotheimia._--Stem jointed, contracted at the articulation, verticillate. 8. _Annularia._--Leaves disposed in a whirl, inserted in a proper ring. 9. _Nœggerathia._--Stem as thick as a goose-quill; leaves alternate, approximate, reverse-ovate, half embracing the stem, pectinato-toothed at the top, the remainder of the edge uncut. 10. _Osmunda._ } This and the following have no generic characters 11. _Asplenium._ } assigned to them, the recent genera being referred to. 12. _Rotularia._--Leaves verticillate, expanded in the form of a small wheel. The third number contains the following additional genera:-- 13. _Lepidolepis._--Scale-like cicatrices truncated at their top.