292 Annals of the Carnegie Museum. 



Occurrence : Ellsworth County, Kansas, Dakota Sandstone (Cre- 

 taceous). Baron de Bayet Collection, Accession No. 2348, Carnegie 

 Museum, Pittsburgh, Pa. (Nos. p, pa, pb, pc). 



ID. Betulites Westii var. latifolius Lesquereux. 



Betulites Westii var. latifolius Lesquereux, The Flora of the Dakota Group, 

 U. S. Geological Survey, Monograph XVII, 1892, p. 61, PL 4, figs. 9-1 1. 



Description : There are several specimens of these leaves, ranging 

 from 4.5 cm. to 6.5 cm. in length and from 4 cm. to 4.5 cm. in width. 



They are ovate, bluntly pointed, denticulate, subtruncate, or broadly 

 cuneate at the base. They are regularly pinnate. The median nerve 

 is straight. The secondaries are equidistant, parallel, and craspedo- 

 drome ; the lowermost pair is suprabasilar and opposite. Petioles are 

 absent. These specimens are for the most part very well preserved. 



Occurrence: Ellsworth County, Kansas, Dakota Sandstone (Cre- 

 taceous). Baron de Bayet Collection, Accession No. 2348, Carnegie 

 Museum, Pittsburgh, Pa. {Nos. 13, 130, i^b, isc, 13d). No. ijc is 

 from the same locality, but of the Chas. Sternberg Collection (C. M., 

 Accession No. 4799). 



II. Betulites Westii var. rotundatus Lesquereu.x. 



Betulites Westii var. rotundatus Lesquereux, The Flora of the Dakota Group, 

 U. S. Geological Survey, Monograph XVII, 1892, p. 61, PI. 4, figs. 12-16. 



Description : The leaves are about 3 cm. in diameter both ways. 

 They are almost round, with a rounded blunt apex and a truncate 

 base. The margin is subentire or indistinctly denticulate. The nerva- 

 tion is pinnate, craspedodrome. The primary nerves are straight. 

 There are about six pairs of secondary nerves which are opposite, 

 parallel, equidistant; the lowermost pair being suprabasilar. The 

 petioles of several are about 15 mm. long, enlarged at the base, and 

 evidently stipulate. 



Occurrence: Ellsworth County, Kansas, Dakota Sandstone (Cre- 

 taceous). Baron de Bayet Collection, Accession No. 2348, Carnegie 

 Museum, Pittsburgh, Pa. (Nos. 17, 17a, 17b, 17c, 176., I7e). 



12. Betulites Westii var. oblongus Lesquereux. 



Betulites Westii var. oblongus Lesquereux, The Flora of the Dakota Group, 

 U. S. Geological Survey, Monograph XVII, 1892, o. 61. PI. 4, figs. 17-19- 



