REPORT OF THE CHIEF- ASTRONOMER 819 



SESSIONAL PAPER No. 25a 



rachis at angles of 65° to 70°. The angles thus indicated deviate somewhat from 

 those given by Dawson (9) in his description of Cycadites unjiga, but in this 

 species, as in C. confertus, Murr., from the Jurassic of India, it is obvious that 

 the angles of the pinnae cannot be relied upon for diagnostic purposes, because 

 of the positions assumed as the result of displacement. A careful comparison 

 with the original text shows that if the angles are to be relied upon, the des- 

 criptive text is to be taken as erroneous and should be recast. Both Dawson's 

 specimens and those now under consideration, are closely comparable with C. 

 pungens, Lesq. (43), from the Dakota Group, and it is altogether probable that 

 future comparisons upon the basis of more complete material, will show them to 

 be identical. 



471 

 In the 1903 collections, several ;specimens represented by the numbers : 



14b, 15a, 16 



show pyritized fragments of leaves occasionally with a strong midrib, were 

 originally determined as representing the pinnae of a Cycad. This they no doubt 



are, and it may now be assumed that they represent the same species as — - — of the 

 1905 collections. 



1428 



Glyptostrobus europ/eus ? (Brongn.), Heer. 



6 



One specimen only, showing a small fragment of a leafy branch. 



. Salix perplexa, Knowl. (?). 



4 



A single specimen representing the lower three-fourths of a leaf, appears to 

 be identical with Knowlton's Salix perplexa (34). The chief difficulty in this 

 comparison is to be found in the fact that this species was derived from the Mas- 

 call Beds of the John Day Basin at Van Home's Banch, and it is therefore of 

 Miocene age, being known in no other horizon. This reference must therefore 

 be taken with reservation. 



. Bopulus cyclophylla, Heer. 



5 



One leaf only, represented by a very imperfect and badly crumpled frag- 

 ment, which makes definite identification very difficult. If correctly determined, 

 the present specimen finds its representative in the Dakota Group of Nebraska, 

 etc., (46). 



25a— vol. iii— 53 



