LANCE FLORA OF EASTBRN WYOMING 157 



There are 2 nearly complete specimens of winged fruits which differ in many details from the 

 specimen referred below to Carpites ulmiformis, which they resemble in a general way. 



Description — Impressions show a perfectly oval samara 13 mm. long and 10-12 mm. wide, 

 apparently completely surrounded by a narrow wing 2-3 mm. wide; seed impression large, 11 mm. 

 long by 7-9 mm. wide, centrally marked by a longitudinal furrow and 2 flanking longitudinal Hnes ; 

 wing marked by numerous straight, spinelike veins; margin entire. 



Except for the longitudinal furrow and lines, there is nothing in common between these 

 winged fruits and that of C. ulmiformis. No comparable fruits have been described or reported, 

 though there is a general similarity to Carpolilhus hirsutus Newberry,^ which was previously 

 regarded as the same. In this species from the Raritan formation the fruits are smaller, are 

 marked by only a single wide groove down the middle, and are distinctly surrounded by bristles 

 rather than a membranous wing. In undescribed collections at the U. S. National Museum there 

 are several winged fruits which are identical with those of Carpites lancensis; these were collected 

 by Brown from the Hell Creek formation of Montana and from the true Lance "on Lance Creek, 

 east bank, opposite and above the month of Bull Creek." - 



The modern relationships or resemblances of these fossil fruits are unknown at the present 

 time. 



Occurrence — Localities P3651, P3853. 



Collection—V. C. Mus. Pal., Cotypes Nos. 2576, 2577. 



Carpites ulmiformis Dorf, n. sp. 

 (Plate 17, Figs. 17, 18) 

 Vlmus sp., Knowlton, BuU. Geol. Soc. Amer., vol. 8, 1930, 1897; Proc. Washington Acad. Sci., vol. 1 1 , 207, 1909 



This species is based on the single specimen figured, which was collected by Knowlton from 

 near the old "Buck Creek corrals." This locality is in the same vicinity as Locality P3859 of 

 the present report. 



Description — This impression consists of an obovate samara 16 mm. long and 13 mm. wide 

 just above the middle; apex openly notched; base acutely elongated into a thin pedicel of indeter- 

 minable length; seed impression narrowly ovoid, 6 mm. wide, extending nearly the full length of 

 the samara, marked distinctly by a central furrow, and less distinctly by 2 longitudinal lines on 

 opposite sides of the furrow; wing broad, entire-margined, and reticulate-veined. 



I have not seen any described or figured fossil fruit which has the characters of this species. 

 In attempting to allocate this fruit to an existing genus I was at first inclined to follow Knowlton 

 in his original reference to Ulmus. After consulting all available species of this genus at the New 

 York Botanical Garden, however, I became convinced that the Lance Creek specimen differs 

 consistently in two respects: (1) it lacks the persistent remnants of the calyx at the base; (2) the 

 prominent furrow and longitudinal lines on the fossil impression have no counterparts, either as 

 lines, furrows, or ridges, in the .seeds of the modern species of Ulmus. Despite a further con- 

 centrated search among living species with winged fruits, I have not been successful in finding a 

 modern analogue. 



Occurrence — U. S. Geol. Survey Locality 1479. 



Collection — U. S. National Museum, Holotype Nos. 40260, 40260a (counterpart). 



Carpites verrucosus Lesquereux 

 (Plate 17, Fig. 7) 

 Carpites verrucosus Lesquereux, Rept. U. S. Geol. Surv. Terr., vol. 7, 305, pl. 60, fig. 23, 1878. 



There is a single, nearly perfect impression which agrees in essential details with the specimens 

 and description of this species from the Black Buttes flora. Its original description was as follows: 



• Newberry, J. S., U. S. Geol. Surv. Mon. 26, 134, pl. 146, figs. 14, 14a, 1896. Hollick, A., U. S. Geol. Surv. Mon. 50, 

 1 10, pl. 7, figs. 3-8, 1906. 



' Field label, U. S. Nationsl Museum. 



