179 



matenal, arc apparently distinct, since Zamia (?) wilcoxensis 

 has pinnules with more than twice as many veins as have the 

 pinnules of Zamia mississippiensis. It is, of course, possible 

 that the two occurrences represent the extremes of variation 

 of a single lower Eocene species, but I do not regard this as 

 probable. 



Only five or six other Tertiary species are known and a 

 majority of these are based on not very well preserved or repre- 

 sentative material. The only non-European form is an un- 

 doubted species of Zamia desciibed by Engclhardt* from the 

 Eocene of Coronel, Chile. The oldest known Tertiary species 

 is Zamites palaocenicus described by Saporta & Marionf from 

 the Thanetian of Gelinden, Belgium. Meschinelli described a 

 species from the Stampian of Venetia, Italy, which he referred 

 to Ceratozamia, and two species have been recorded from the 

 lower Miocene (Aquitanian) of Europe — a Zamites from southern 

 France t and a well-marked Encephalartos from Kumi in Greece. § 

 Heer recorded a species of Zamites from the Helvetian of Switzer- 

 land and a species of Cycadites from the Tortonian of that 

 country, but both of these are rather doubtful determinations.] j 

 The present species, while based upon a limited amount of 

 material, is sufficient to establish the undoubted relationship of 

 the fossil as the accompanying text figures show, and it is quite 

 possible that future discovery will reveal other members of this 

 interesting family in the later Tertiary deposits of this legion 

 since the plants thus far collected from the upper Eocene and 

 lower Oligocene were more tropical in character than those from 

 the lower Eocene. 



Johns Hopkins University, 

 Baltimore 



* Engelhardt, H. Abh. Senck. Naturf. Gesell. i6: 646. pi. 2. f. 16. 1891. 

 t Saporta & Marion, Rev. Fl. Heers, Gelind. 20. pi. i. f. 4, 5. 1878. 

 t Saporta, Bull. Soc. geol. Fr. (ii) 21: 314-328. pi. 5. 1864. 

 § Saporta, Bull. Soc. bot. et hort. Provence, 41-44, i pi. 1880. 

 il Heer, O. Fl. Tert. Helv. i: 46. pi. 13; pi. 16. f. i. 1855. 



