294 Annals of the Carnegie Museum. 



15. Betulites Westii var. rhomboidalis Lesquereux. 



Betnlites Westii var. rhomboidalis Lesquereux, The Flora of the Dakota Group, 

 U. S. Geological Survey, Monograph XVII, 1892, p. 62, PI. 5, figs. 6, 7. 



Description: The leaf is about 6.5 cm. long and the same width 

 near the middle. It is rhomboidal, with blunt apex and broadly 

 cuneate base. The veining is not very distinct, but there are evidently 

 four or five pairs of secondaries which are nearly or quite opposite, 

 parallel, and craspedodrome. The areolation is very distinct in some 

 portions, this being a characteristic of Betulites. 



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

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

 Museum, Pittsburgh, Pa. {No. 31). 



16. Betulites Westii var. obtusus Lesquereux. 



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

 U. S. Geological Survey, Monograph XVII, 1892, p. 61, PI. 4. figs. 5-8. 



Description: The leaf is 3.6 cm. long and 3.2 cm. in width. It is 

 oblpng-oval and rounded at the apex. The margin is minutely den- 

 ticulate, this character showing very distinctly near the apex. There 

 are six pairs of secondaries. The veining is distinctly that of 

 Betulites. 



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

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

 Museum, Pittsburgh, Pa. {No. 45). No. 45a is one of the collection 

 from the U. S. National Museum (C. M., Accession No. 4799). 



17. Betulites Westii var. quadratifolius Lesquereux. 



Betulites Westii var. quadratifolius Lesquereux. The Flora of the Dakota 

 Group, U. S. Geological Survey, Monograph XVII, 1892, p. 62, PI. 5, fig. g. 



Description: The leaf is about 4.5 cm. long and 5 cm. wide. There 

 are five pairs of secondaries. The lowermost pair curves downward 

 in reaching the midrib more than any of those figured under Betulitds 

 by Lesquereux op. cit. The veining, however, and the general ap- 

 pearance of the leaf is distinctly that of Betulites. 



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

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

 Museum, Pittsburgh, Pa. {No. 46). 



