DESCRIPTION OF SPECIES. 91 



Order LAURINE^. 



Tribe LITSEACE^E. 



Laurus plutonia Heer. 



PI, XIII, Figs. 5, 6 ; PI. XXII, Fig. 5. 



Fl. Foss. Arct., vol. 6, 2 Abth., p. 75 ; PI. xix, Figs. Id, 2-4 ; PI. xx, Figs. 3a, 4-6 ; PI. 

 XXIV, Fig. 6b ; PI. XXVlii, Figs. 10, 11 ; PI. XLII, Fig. 4b. 



Leaves subcoriaceoiis, lanceolate, naiTOwed l)oth way.s in the same 

 degree, acuminate, entire ; primary nerve rather narrow; secondaries nu- 

 merous, at an acute angle of divergence, arcuate, the intervals reticulate. 



This is Heer's description with which the Kansas specimens agree as 

 well as with the figures of that author (loc. cit.). Many leaves of the same 

 character have been seen in the specimens examined ; but though they are 

 of the same form and size, the reticulation is rarely distinct. Even the two 

 leaves figured liere are less distinctly reticulate than seen in the drawing. 

 In Heer's figures also the reticulation is marked only upon one leaf (loc. 

 cit., Fig. 6 of PI. xx), and even there it is still obscure, appearing in small, 

 polygonal areoles. Hence the identification of fragments of leaves of this 

 species is not always certain. The lateral nerves are generally more or less 

 undulate, especially in their upper j)art, not as distinctly curved near the 

 borders as in L. primif/cnia Ung., of wliich the leaves are much alike and 

 from which they differ by the narrow median nerve, the less thick textui'e, 

 the surface not polished, and the basilar pair of secondaries at a- more acute 

 angle of divergence. 



The leaf, PI. XXH, Fig. .''), is doubtfulh" referred to this species. 

 The nervation is totally obsolete, as it is also in most of tlie figures of the 

 author, none of which lias tlie uj)per part jireserved. The form of the leaves 

 is identical. 



Habitat : Kansas, ]\[innesota, etc. No. 4093, in many specimens of the 

 collection of Mr. R. D. Lacoe. Fig. 6 is from a specimen communicat(Ml 

 by Prof N. H. Winchell, from Minnesota, and figured on PI. ii, Fig. 5, of 

 his Geological Report, as yet unpublished. 



Laurus nebrascensis Lesq. 



Cret. Fl., p. 74, PI. x. Fig. 1; Pi., xxviii. Fig. 14. 



Persea nebrascensis Lesq., Trans. Am. Pljil. Soc, vol. 13, 1869, p. 431, PI. xxiii. Figs. 

 9, 10. 



