3() FOSSIL PLANTS FROAf MONTANA KNOWLTON. 



margins coarsely and obtusely sinnate — tootlu'd above, simple or waved 

 below; petiole I to ()"" lon.si-, straight, very tliiek; nervation pinnate; 

 very strong; midrib straight or slightly llexuose; lateral nerves about 

 six pairs, somewhat crowded below, more remote above, alternate, 

 basilar pair usually short and simple and uniting above with the ter- 

 tiary branches of the second pair to form a marginal festoon; middle 

 secondaries each bearing one or two, rarely three, branches near the 

 summit, ui)i)er ones generally simple; tertiary nervation very distinct, 

 Ibrming lattice-like bars c<mnectiiig the secondary nerves at right 

 angles. 



The above description is, with slight moditication, the one given by 

 Dr. Newberry (loc. cit.) for this Phi/Uites ('iqmnioides, the changes being 

 simply relatively unimportant details atforded by later and in some 

 respects more perfect material than he evidently had at his disposal. 

 It will also be observed that this description does not differ essentially 

 from that given by Piof. Ward for his Ptcnhs^wnititcs Whitei. A com- 

 [)arisou of the ligures of the latter si)ecies "witli those given by Kew- 

 berry and also with the ones under discussion shows that they agree 

 essentially, the differenci's being insnflicient to i)ermit a generic or 

 even a specific separation. The leaves tigured by Prof. Ward are a 

 little less strongly toothed and more markedly heart-sliaped at base. 

 The nervation is the same in both. 



Dr." Newberry's specinu'ns are labeled "Fort Tnion, Dakota," which 

 is in the vicinity of the moutli of the Yellowstone; but, as the Fort 

 Tnion group is ex])osed in ])ractically identical material from above 

 the mouth of the Powder River to the ^Missouri at the mouth of the 

 Yellowstone, they are shown to be from similar if not identical beds. 

 Several of Dr. Xewberiy's types are in the collections of the United 

 States National ^luseuni and are seen to agree exactly with the pres- 

 ent and other material from the Yellowstone. 



Vibuinuni asperuni Xf\vl>y. 



Later Extiuct Floras, p. 54; lllustr.itioiis of Vrct. and Vvrx. Plants. PL x\t. Figs. 

 8, 9. 

 A single, considerably broken Ual" seems to belong to this species. 

 The type specimens were obtained by Dr. llayden near Fort Union. 



