FROM THE TERTIARY OF THE STATE OF MISSISSIPPI. 



419 



with its lower part slightly decreasing towards the base and abruptly rounded or truncate 

 on both sides of the basilar part of the nerve. By its peculiar form, its percurrent slightly 

 curved medial nerve, and its obscure reticulation, this leaf is referable to Ileer's species 

 in Flor. Helv. Tert. ii, page 98, PI. xcvii, Figs. 44 to 48. It is essentially similar to both 

 specimens of Fig. 44, which show a truncate base, a curved medial nerve, and an obtuse 

 point like ours. In the American leaf the areolae appear smaller and more distant than 

 are figured in European specimens. 



18. Persea lancifolia, Spec. nov. PI. xix, Figs. 3 and 4. P. foliis lanceolatis, utrinque attenuatis acutis 

 vel aouminatis, integerrimis, nervo medio crasso, nervis secundariis angulo acuto cgrcdicntibus, distautibus curva- 

 tis, camptodromis. 



lied shale and yellow coarse clay. 



A number of specimens have been collected, both on the red shales and the coarse clay 

 in the same state of preservation as those which I have figured. The form of the point 

 and of the basilar part of these leaves is not known. The details of nervation are obso- 

 lete, the medial nerve is remarkably broad, the secondary ones curve upwards from an 

 angle of divergence of about 40°. The lanceolate entire, apparently membranaceous 

 leaves, enlarged in the middle, taper equally to both ends. I do not know of any near 

 relation to this species. It may be compared to Persea epeciosa, Hecr, from the Upper 

 Miocene of Europe. 



19. (Jeanotous Mbigsii, Spec. nov. PI. xix, Pigs. 5, 6, 7. C. foliis petiolatia, late ovatis, basi truncatis, 

 cordatisve, in longum apicem attenuatis, obtuse wequalitcr aerratis, triplinerviis, nervis secundariis infimis basilari- 

 bus, tenuibus, superioribus crassis, nervo primario subacqualibus, arouatis, extrorsuni inferne ramosis, aorodromia 

 imperfeotis. 



Yellow coarse clay, Mississippi ; soft white clay, La Grange, Tennessee. 



Allied to Geanothus Tilimfolim, Ung., of the Miocene of Europe, this species also resem- 

 bles our living Geanothus Americanus, L. The difference is essentially in the lon°- narrow 

 point of the fossil leaves, in their large size, and in the obtuse and more equal teeth which 

 surround them. Both species have in common the general form of the leaves and the 

 nervation. This genus, still represented by many species in our flora, especially in Cali- 

 fornia, has apparently left numerous representatives in the recent formations of our coun- 

 try. There is in Prof. Hilgard's collection a number of specimens of this species, and 

 from eight specimens sent from La Grange, two of them belong to it. I have found also 

 in the chalk-banks of Columbus, Kentucky, another species still more like Ceanothus 

 Americanus, L., indeed undistinguishable from it,* with shorter, obtusely pointed, more 

 irregularly serrate leaves. 



* Journal of Science, § ii, vol. xxvii, p. 365. 



