530 MESOZOIC FLOKAS OF UNITED STATES. 



to acute than obtuse. The average leaves resemble most that one given 

 in the Potomac Flora, pi. clvi, fig. 5. but some of them seem to have been 

 longer. They seem to have been oblong in form, with a rather strong 

 midnerve. The secondary nervation is slender, going off pinnately and 

 very obliquely fi'oni the midrib and curving toward the apex of the leaf 

 with a flexuous course. The secondary nerves send off at a very large 

 angle tertiary ones, which anastomose with their like, forming irregular, 

 large polygonal meshes. This tertiary nervation is, in pi-oportion to the 

 secondaiy, very strong. PI. CXIII, Fig. 7, gives a fragment of a leaf 

 of the largest size with the teeth somewhat blunted by maceration. 

 Fig. 8 depicts a smaller, nearly entire, leaf. The toothing in this latter 

 is closer and less deeply cut than in many of the specimens. In general 

 the teeth of this plant vary a good deal in size, depth, and sharpness. 

 Both the specimens figured were collected on November 25, 1891. 



Eucalyptus ro.sieriana Ward n. sp." 

 PI. CXIII, Figs, y, 10. 



Three specimens of a dicotyledon from Hosiers Bluff were indicated 

 on the labels by Professor Ward as Eucalyptus Geinitzi Heer. As this 

 species is unknown to me I have recjuested Professor Ward to describe 

 it (see accompanying footnote). 



(I Three specimens of a dicotyledonous leaf with the form and nervation of Eiicalvptvis weie collected by 

 Mr. White and myself on November 2.5, 1891, which upon examination I was inclined to refer to E. Geinitzi 

 Heer, and had so lalieled them. Professor Fontaine returned them without description with the request that 

 I treat them, as he was unacquainted with that species. He indicated one of the specimens to be figured, and 

 1 have thought best to figure two of them, to bring out the characters. On further comparison with all the 

 f]<nires that have been published of E. Geinitzi, both in Europe and in America, I have decided that the form 

 from Hosiers Bluff does not belong to that species, but is a new species, and I name it for the locality. It 

 has the following character: 



I.*aves small and narrow, about 7 cm. long by 1.5 mm. wide, widest at about the middle, tapering to both 

 base and summit, somewhat falcate, especially in the upper part: margins entire, but somewhat undulate; 

 midrib strong, central through the leaf; lateral ncn-es distinct, numerous, close together, parallel, proceeding 

 from the midrib at a large angle so as to be only slightly ascending, curving upward near the margin and 

 forking at the point where the curvature is greatest, the lower branch abruptly descending and joining the next 

 nerve below in such a manner as to produce an apparent marginal nerve 1 mm. from the margin, numerous 

 nervillcs crossing the spaces between the secondaries at various angles, forming a network of very irregular 

 meshes; petiole, base, and tip unknown. 



This species is nearest to Eucabjptm t angiixtifolia Newb.: Flora of the Amboy Clays (Monogr. U. S. 

 Geol. Surv., Vol. XXVI), p. Ill, pi. xxxii, figs. 1, 6, 7, especially as .seen in fig. 7, but the .secondary nerves 

 are much more nearly horizontal and the form and nervation are difl'erent. — L. F. W. 



