804 DEPARTMENT OF TEE INTERIOR 



2 GEORGE V., A. 1912 



assigned on the basis of Lesquereux's original determination must be viewed as 

 wholly provisional. 



As presented to us in the present collections, this plant appears from two 

 different localities, although representing the same geological horizon — 250 

 and 1007. The specimens show the plant in somewhat different conditions of 

 preservation, but with a certain constancy of characters which permit of coordina- 

 tion. They are always more or less distinctly rugose, sometimes also with trans- 

 verse wrinkles. They sometimes appear without any evidence of venation, while 

 in other instances they show a pronounced indication of a strong, central nerve 

 or midrib. They are among the forms which are entirely new to the region 

 under consideration, but they are recognized components of the Green Biver 

 Group of Randolph's County, Colorado (42). 



The specimens now in hand are fragments 8-9 cm. long ana 2-G cm. wide; 

 much altered by decay, but showing imperfectly, a rather fine, parallel venation 

 and marked evidences of a strong, central midrib which, however, is not 

 infrequently wanting in the narrower specimens. There is also, frequently, a 

 strong transverse wrinkling due to longitudinal displacement. 



Our specimens present a somewhat strong resemblance to the somewhat 

 recently described Anomalophyllites bridgetonensis of Hollick, from the Yellow 

 Gravels of Miocene age at Bridgeton, 1ST. J. (32). This is a problematical form 

 which Dr. Hollick has referred to Anomalophyllites as probably representing its 

 nearest affinity, but it is difficult for me to make any precise distinction between 

 it and Cyperacites according to the accepted definition of that genus. As a 

 provisional reference, perhaps it is of little consequence which genus is given 

 the preference. Our material seems to differ from Hollick's A. bridgetonensis 

 in being much narrower, and in having a much shorter and more slender petiole, 

 differences which are specific rather than generic, while they may also, possibly, 

 represent accidental differences in imperfectly preserved material. 



250 271 



■2.5, 11. & 1, 2, 7. ° 



A number of poorly preserved fragments of leaves, the exceedingly frag- 

 mentary condition and imperfect structural markings of which make specific 

 reference of doubtful value. But provisionally, at least, it would seem that 

 they must be assigned to Cyperacites. 



?52 of 1906. 



The specimens included under this number are exceedingly problematical. 

 They represent fragments of endogenous leaves which are not complete either as 

 to their length or breadth, base or apex. It is, therefore, impossible to reach 

 final conclusions respecting them. They show, however, a parallel venation, a 

 regular plication (?) or series of rounded ridges distant at rather regular 

 intervals of 4 mm. No other structural details are recognizable. Precisely the 



250. 

 same plant appeared in the collection of 1903 under the number -y~~ 5" The 



