132 CONTRIBUTIONS TO PAL^ONTOLOGY 



Flabellaria communis Lesquereux, U. S. Geol. and Geog. Surv. Terr., Ann. Rept. (1875), 385, 1876. 

 Sabal irujuirenda Knowlton, U. S. Geol. Surv. Prof. Paper 101, 288, pl. 56, 1917. 

 Saball rtigosa Knowlton, U. S. Geol. Surv. Prof. Paper 101, 288, pl. 58, 1917. 

 Sabal? eocenica Knowlton, U. S. Geol. Surv. Bull. 696, 557, 1919. 



There are 2 impressions from Locality P3853 which have the characters considered diagnostic 

 of this species. Knowlton has previously reported this species (as Flabellaria eocemca) from the 

 Lance Creek area.* I have seen this specimen in the collections at the U. S. National Museum; 

 it is not numbered, so that the exact locaHty from which it was collected is not known. In view 

 of the present discovery of this species in the same region, it is reasonably certain that Knowlton 

 was correct in stating that his specimen was collected from the type Lance formation. 



In addition to its present occurrence, this species is reported only from fioras which I con- 

 sider the uppermost Cretaceous in the Rocky Mountain region: the Black Buttes, the lower Raton, 

 and the Medicine Bow; it is also present in the Laramie flora, being represented in the collection of 

 undescribed and unlabeled Laramie specimens at the U. S. National Museum (specimens Nos. 

 570a, 1327). 



Occurrence — Locality P3853. 



CoUection—\J. C. Mus. Pal., Pleisotype No. 2487. 



Saballtes montana (Knowlton) Dorf 

 (Plate 6, Fig. 12) 



Sabalites montana (Knowlton) Dorf, Carnegie Inst. Wash. Pub. No. 508, pt. I, 47, pl. 3, fig. 2, 1938; Bull. 



Geol. Soc. Amer., vol. 51, 218, 222, 225, 1940. 

 Sabal montana Knowlton, U. S. Geol. Surv. Prof. Paper 101, 2.53, pl. 32, fig. 3, 1917; U. S. Geol. Surv. Prof. 



Paper 130, 119, pl. 3, fig. 4, 1922. 

 Sabalites grayanus (Lesquereux) Lesquereux (in part), Rept. U. S. Geol. Surv. Terr., vol. 7, 112, pl. 12, fig. 1 



(not pl. 12, fig. 2), 1878. Knowlton, U. S. Geol. Surv. Prof. Paper 155, 36, pl. 9, fig. 5, 1930. 

 ISabal rigida Hatcher, Ann. Carnegie Mus., vol. 1, 263, text fig. 1, 1901. 



In addition to a large number of impre.ssions of the outer rays of palm leaves, the Lance Creek 

 collcctions contain 2 impressions of the basal parts of leaves, of which the better is figured. In 

 size, appro.ximate number of rays, and length and character of acumen, these impressions are 

 referable to the species Sabalites montana. 



In 1900 Hatcher collected an impre.ssion of a part of a palm leaf from the Lance Creek area. 

 This was described and figured as a new species, Sabal rigida. In the absence of the diagnostic 

 basal part of this leaf, it is doubtful whether the recognition of this specimen as a distinct species 

 will serve any useful purpose. I have questionably united it with the present species, whose 

 outer rays are of the same general character and size. 



As known at present, this species occurs in the upper Mesaverde group and the Vermejo, 

 Laramic,^ Medicine Bow, lower Denver, and type Lance formations. 



Occurrence — Locality P3853. 



Collection—V. C. Mus. Pal., Plesiotype No. 2486. 



Family ARACE^ 



Genus PISTIA Unn6 



Pistia corrugata Lesquereux 



(Plate 7, Figs. 3, 4, 6) 



Pislia corrtigata Ix-squercux, U. S. Geol. and Geog. Surv. Terr., Ann. Rept. (1874), 299, 1876; Rept. U. S. 



Geol. Surv. Terr., vol. 7, 103, pl. 61,fig8. 1,3,4,6,7,9-11, 1878. Knowlton, U. S. Geol. Surv. Bull. 163, 



31, 1900; U. S. Geol. Surv. Prof. Paper 98, 334, pl. 85, fig. 4, 1916. Berry, Canada Gcol. Surv. Mem. 182. 



23, 1935. Brown, U. S. Geol. Surv. Prof. Paper 189, 248, pl. 49, figs. 7-9, pl. 56, fig. 6a, 1939. Dorf, 



Bvill. Geol. Sor. Amcr., vol. 51, 218, 222, 225, 1940. 

 Oltrlia americana I^squercux, U. S. Geol. and Geog. Surv. Terr., Ann. Rept. (1874), 300, 1876; Rept. U. S. 



Geol. Surv. Terr., vol. 7, 98, pl. 61, fig. 8, 1878. Knowlton, U. S. Geol. Surv. Bull. 163, 32, 1900. 

 Lemna sculala Dawson. Lesquercux, Rcpt. U. S. Geol. Surv. Terr., vol. 7, 102, pl. 61, fig. 5 only, 1878. 



' Knowlton, F. H.. Proc. Waahington Acad. Sci.. vol. 11. 207. 1909. 



' In addition to tho figurcd Laramie spccimcn, thcro ie a bctter, undescribed Bpecimen (No. 569o) in the Laramio col- 

 lection at the U. S. National Muscum. 



