286 UNITED STATES GEOLOGICAL SDRVEY— TERTIAEY FLOE A. 



10-1 2 (^Dr.J. L. LeConte). These fragments were originally figured for a series 

 of plates which have not been published. They have been preserved without 

 modification. Fig. 13 is from a specimen found at Evanston, Wyoming, with 

 numerous ones of the following species. 



Jug^Iaiis ru§rosa, Leeqz. 

 Plate LIV, Figs. 5, 14 ; Plate LV, Figs. 1-9; Plate LVI, figs. 1,2. 



Jugluns TOffOsa, Leaqx., Annual Report, 1869, p. 19G; 1871, pp. 287, 298; Supplement, pp. 10,12; 1872, 



pp. 382, 390, 404, 407. 

 Juglans acuminatat (Al. Br.), Lesqx., Annual Eeport, 1871, p. 288 ; Supplement, p. 8. 



Leaves variable in size, subcoriaceous, wrinkled-rugose on tbe surface, entire, undulate, oblong- 

 oval, abruptly acuminate, rounded to a sbort petiole ; lateral nerves open, curved, thick ; nervilles thick, 

 branching in right angle; areolation irregularly quadrate. 



The leaves are oblong, rarely enlarged in the middle, rounded, broadly 

 cuneate, even subcordate at the base. The nervation is very deeply marked, 

 coarse, and therefore the surface runcinate. It is besides generally rugose. 

 The degree of relation of this species to J. acuminata is so clearly marked 

 that I have been for years, and am still, uncertain, if the numerous leaves 

 which represent it, and which are found especially in the first and second 

 groups of the Lower Lignitic, should not be referable as mere varieties to 

 J. acwn'mata, so widely distributed in the Miocene of Europe. The differ- 

 ences are especially in the oblong shape of the leaflets, whose borders, more 

 undulate than in the European forms, are generally nearly parallel in the 

 middle; more abruptly acuminate, and the surface rough. But in the 

 numerous specimens which I have examined, some have the characters of 

 J. acuminata, as the point represented in pi. Iv, fig. 9, or the gradually 

 narrowed base of fig. 5, same plate. It is thus evidently an American 

 form, whose degree of relation to the European species can be ascertained 

 only by the comparison of specimens. 



Habitat. — Six miles above Spring Cafion, near Fort Ellis, Montana; 

 Evanston, Wyoming; very abundant at these localities {Dr. F. V. Hat/den). 

 Plate Iv is composed mostly of Evanston specimens. — Black Buttes, Wyo- 

 ming, and Golden, Colorado; less common. One of the specimens commu- 

 nicated by Dr. A. R. Marvine bears the label, "South borders of North 

 Park", a locality whose geological station is unknown to me. As there is 

 from the same station a leaf of Cissus lobato-crenata and fragments of Sabal, 

 I consider it as Lower Lignitic. 



