146 CONTRIBUTIONS TO PAL^ONTOLOG\ 



Family DILLENIACE^ 



Genus DILLENITES Berry 



Dillenites cleburni (Lesquereux) Dorf, n. comb. 



(Plate 13, Fig. 1) 



Rhamnus cleburni Lesquereux, U. S. Geol. and Geog. Surv. Terr., Ann. Rept. (1872), 381. 400, 1873; Rept. 



U. S. Geol. Surv. Terr., vol. 7, 2S0, pl. 53, figs. 1-3, 1878. Berry, U. S. Geol. Surv. Prof. Paper 91, 283, 



1916. Knowlton, U. S. Geol. Surv. Prof. Paper 101, 332, pl. 113, fig. 3, 1917; U. S. Geol. Surv. Prof. 



Paper 155, 104, only pl. 46, figs. 10, 11, 1930. Berry, Canada Geol. Surv. Mem. 182, 45, 1935. Dorf, 



Carnegie Inst. Wash. Pub. No. 508, pt. I, 67, pl. 14, figs. 5, 6, 1938; Bull. Geol. Soc. Amer., vol. 51, 222, 



1940. 

 Rhnmnus reclinerris Heer (in part). Lesquereu.x, U. S. Geol. and Geog. Surv. Terr., Ann. Rept. (1871), 295, 



298, 1872; U. S. Geol. and Geog. Surv. Terr., Ann. Rept. (1872), 382, 397, 402, 1873; U. S. Geol. and Geog. 



Surv. Terr., Ann. Rept. (1873), 405, 1874; Rept. U. S. Geol. Surv. Terr., vol. 7, 278, pl. 52, fig. 15 onlv, 



1878. 

 Rhamnus hrittoni Knowlton, U. S. Geol. Surv. Prof. Paper 130, 156, pl. 15, fig. 6, pl. 24, fig. 8, 1922. 

 Rhamnus marshallensis Knowlton, U. S. Geol. Surv. Prof. Paper 130, 155, pl. 15, fig. 3, 1922. Dorf, Bull. 



Geol. Soc. Amer., vol. 51, 222, 1940. 



There are several fairly complete specimens f rom Localit}' P3652 which are esseRtiallj' similar 

 to the average leaves of this species, such as the original t}'pe specimens figured by Lesquereux. 

 In addition, there are several smaller leaves, one of which is here figured, which were identified 

 as Rhamnus marshallensis in my earlier report on the type Lance flora. After a thorough examina- 

 tion of the tj'pe collections at the U. S. National Museum, I believe that there can be no vaUd 

 basis for separating this species from R. clehurni. These smaller leaves difTer from the type speci- 

 mens of R. cleburni only in the number of secondaries; they are precisely the same in their shape, 

 in their parallel, closely spaced secondaries, and in their very characteristic tertiary venation. 

 The Laramie specimen which Knowlton named R. marshallensis is here regarded as an incomplete 

 specimen of the same form. 



The coUections at the U. S. National Museum contain several undescribed specimens which 

 appear to belong to this species. In the Laramie collection, for example, there is a single specimen 

 (No. 4367, with Cissus lobato-crenata) which is similar; in the Vermejo collection there are 7 

 specimens (see especially Nos. 51216, 51219) which have the typical characters of R. cleburni; 

 and in the Denver collection there are 2 smaller leaves (No. 37828) which are similar in form and 

 size to the Lance Creek specimen here figured. It is evident that this species is well represented 

 in the late Cretaceous deposits of the Rocky Mountain region and is not yet authentically reported 

 from beds of undisputed Paleocene age. 



After a continued search for comparable leaf forms among living species, I am convinced of 

 the close resemblance of these fossil leaves to the Dilleniacese. The similarity to Doliocarpus 

 dentatus (Aubl.) Standley and Davilla multiflora St. Hil. has already been pointed out.' Con- 

 tinued reference to Rhamnus would only be misleading and is wholly unsupported by comparison 

 with modern leaves. It has therefore seemed advisable to refer this species to the genus Dillcnites. 



Occurrence — Localities P3G51, P36o2. 



CoUection — U. C. Mus. Pal., Plesiotype Nos. 2534, 2534a (counterpart). 



Family MYRTACE^ 



Genus MYRTOPHYLLUM Heer 



Myrtophyllum torreyi (Lesquereux) Dorf, n. comb. 



Mt/rica torreyi Le.squereux, U. S. Geol. and Geog. Surv. Terr., Ann. Rept. (1872), 392, 1873; Rept. U. S. Geol. 

 Surv. Terr., vol. 7, 129, pl. 16, figs. 3-10, 1878. Ward, U. S. Geol. Surv. 6th Ann. Rept., 551, pl. 40, fig. 

 4, 1885; U. S. Geol. Surv. BuII. 37, 32, pl. 14, fig. 5, 1887. Knowlton, U. S. Geol. Surv. BuII. 163, 34, pl. 6, 

 figs. 1-3, 1900; U. S. Geol. Surv. Prof. Paper 98, 90, 336, pl. 17, fig. 7, pl. 86, fig. 1, 1916; U. S. Geol. 

 Surv. Prof. Paper 101, 2.56, pl. 37, figs. 2-4, 1917; U. S. Geol. Surv. Prof. Paper 130, 123, 1922. Dorf, 

 Carnegie Inst. Wash. Pub. Xo. .508, pt. I, 49, pl. 4, figs. 1, 2, 3, 1938; BuII. Geol. Soc. Amer., vol. 51, 218, 

 222, 225, 1940. 



' Dorf, E., Carnegie Inst. Wash. Pub. No. 508, pt. I, 68, 1938. 



