380 



ever, of no moment for the specification of poplar-leaves, as can be re- 

 marked in the examination of a few leaves of the too common Populus 

 alba. In fossil species, Pojndus MassiUensis^ Sap. (Et., 3, 2, p. 30, PL II, 

 fig. C), is represented by three leaves, each of a different character of 

 nervation. The relation of this species with that of the Tertiary 

 (Miocene?) of Provence, described by Saporta, may be therefore more 

 intimate than it appears from the comparison of a single leaf. Our 

 species is also comparable to Populus heliadum, Uug., by its form, and 

 to T. melanaria, Heer, by its nervation. 

 Habitat. — Point of Eocks, William Cleburn. 



12. VlBUEKUM MARGINATUM, Lsqx. 



The specimen is fragmentary^, but the species, very common at Black 

 Butte, is recognizable. 



13. DiOSPYEOS BEACHYSEPALA, Al. Br. 



Eepresented in good specimens. 



14. TeAPA % MICEOPHYLLA, Lsqx. 



Like the former, in good specimens, and described already from Dr. 

 Haydeu's collection. 



15. Geeviopsis Clebueni, sp. nov. 



Leaves of medium size, subcoriaceous, ovate, rounded, and narrowed 

 by an inward curve to the short petiole, sinuato-denticulate, three-nerved 

 from above the base; primary veins thick; secondary veins, two or 

 three pairs, distant from each other, and also from the primary nerves, 

 all branching outside with subdivisions or veiulets entering the teeth ; 

 nervilles in right angle to the veins, flexnous, simple, or branching in 

 the middle ; areolation obsolete. 



This fine leaf, about five centimeters long (the point is broken), four 

 centimeters broad in its widest part, below the middle, is so remarkably 

 similar by its form, the denticulate borders, and the nervation, to Grevi- 

 opsis orbiculata, Sap. (Sezane Fl., p. 411, PI. XI, fig. 11 and 12), that its 

 generic identity is positive. It specifically differs b}- its larger size, the 

 more distant veins, and the double ramification of the primary nerves. 

 This ramification is more distinct and more generally multiple, the 

 branches forking before reaching the borders and curving along them. 

 The leaf has, like those of the European species, a subbasilar marginal 

 veinlet, which follows the borders, and is united by nervilles in right 

 angle to the primary lateral nerves above. 



Habitat. — Point of Eocks, William Cleburn, 



As said above, these species from Point of Eocks do not modify in 

 the least the geological relation of the locality as indicated by its flora. 

 Besides Viburnum marginatum, which is a most common iilant of Black 

 Butte, we have in Mr. Cleburn's specimens four new species only, not 

 enumerated in the table of Dr. Hayden's, viz : Salvinia attenuata, Popu- 

 lus melanarioides, Dryophyllum sttb/alGatum] and Greviopsis Cleburni. 

 The first two species have typical affinity with the Miocene : Salvinia 

 attenuata with IS. Mildeana of the Baltic flora; Populus melanarioides 

 with P. tremukvfolia of the Marseilles basin. The other two are of 

 Lower Eocene type: Greviopsis Cleburni related to the Sezane flora and 

 Pryophyllum svbfalcatum to that of Gelinden. The Tertiary character is 

 therefore here also positively marked, while at the same time a relation 

 to the Cretaceous is pointed out by the last-named species. Professor 

 Schimper, in his Paleontologie vegetale^has separated Sezane and Gelinden 



