156 CONTRIBUTIONS TO PAL^ONTOLOGY 



Occurrence — U. S. Geol. Survey Locality 1462. 



Collection—\]. S. National Museum, Holotype Nos. 40259, 40259a (counterpart). 



Phyllites sp. 

 (Plate 17, Figs. 9, 14) 

 Zizyphus ripkyensis Berry. Dorf, Bull. Geol. Soc. Amer., vol. 51, 218, 222, 225, 1940. 



The reported presence of Zizyphvs ripJeyensis in the Lance Creek coUection was based on 

 the specimen shown in plate 17, figure 9. The recent discovery of a second specimen of precisely 

 similar venation shows, however, that this leaf form is not lanceolate, as might be surmised from 

 figure 9, but is distinctly ovate, as shown in figure 14. This precludes the possibilitj^ of its identity 

 wnth the Ripley species, which is consistently lanceolate or ovate-Ianceolate. 



I have been unable to find any other described fossil species, either in the Cretaceous or in 

 the Tertiary, which has the characters here observed. The inadequate Laramie specimen of 

 Zizyphus coloradensis Knowlton ^ is comparable, but lacks the secondary veins along the midrib, 

 which are so characteristically defined in the Lance Creek specimens. 



Occurrence — Locality P3853. 



CollecHon—V. C. Mus. Pal., Nos. 2571, 2572. 



Phyllites sp. 

 (Plate 17, Figs. 5, 13) 



There are several fragmentary leaf impressions from two localities which are of a different 

 form from any others in the Lance Creek collections. The figured specimens show the upper 

 part of a leaf with numerous parallel secondaries ending in a doubly serrate margin. Other poorly 

 preserved impressions indicate that these leaves are ovate-Ianceolate and asymmetrical at the 

 base. This combination of leaf characters suggests ulmaceous affinities. It is unfortunate that 

 the lack of adequate material prevents a full description. In observable features there is a sug- 

 gestion of resemblance to the Denver specimen referred to Uhnus antecedens Lesquereux,- and to 

 the Raton specimen of Ulmus sp.' 



Occurrence — Localities P3855, P3858. 



Colleclion—V. C. Mus. Pal., Nos. 2573, 2574. 



Phyllites sp. 

 (Plate 17, Fig. 16) 



The figured specimen is the only one of this kind in the Lance collections. I had tentatively 

 regarded it as rather closely similar to the specimen from the Dakota sandstone referred to 

 Populus microphylla Newberry.'' Recently, however, Brown has re-examined the Dakota speci- 

 men and states that after cleaning it "shows numerous small teeth instead of the large teeth as 

 illustrated." ^ The general shape and venation of the Lance specimen is suggestive of sorae of 

 the aberrant leaves of Cercidiphyllum arcticum (Heer) Brown,'^ yet tlie extraordinarilj' large teeth 

 are not to be seen in any figured specimens of that species. 



I have not encountered any modern leaves with which this specimen can be compared. 



Occurrence— Locality P3854. 



Collection—V. C. Mus. Pal., No. 2575. 



Carpites lancensis Dorf, n. sp. 



(Plate 17, Figs. 10, 15) 



CarpoliOius hiraulus Xewberry. Brown, U. S. Geol. Surv. Prof. Paper 189, 253, pl. 61, figs. 17-19, 1939. 

 Dorf, Bull. Geol. Soc. Amer., vol. 51, 218, 222. 1940. 



' Knowlton, F. H., U. S. Gcol. Surv. Prof. Papcr 130, 157, pl. 15, fig. 5, 1922. 

 ' Knowlton. F. H., U. S. Geol. Surv. Prof. Paper 155, 62, pl. 23, fig. 7, 1930. 

 ' Knowlton, F. H., U. S. Gool. Surv. Prof. Papcr 101, 300, pl. 70, fig. 4, 1917. 

 ' Newbcrry, J. S., U. S. Geol. Surv. Mon. 35, 40, pl. 3, fig. 5, 1898. 

 ' Brown, R. VV., Jour. Paleontol., vol. 13, 491, 1939. 

 • Ibid., 492, pl. 53, fig. 5, pl. 64, fig. 2. 



