148 



Newberry's figures show the pinnae at the extremity of the 

 frond to be either entire or wavy-margined and confluent along 

 the rachis, while lower down they are subdivided into more or 

 less distinct pinnules and are apparently separated from each 

 other, although the basal pinnules are attached to the rachis. 



The only difference on the part of our specimen is that the 

 basal pinnules are free ; but this may be and probably is due to 

 its representing a yet lower portion of a frond than is depicted in 

 either of Newberry's figures, which in themselves indicate a tran- 

 sition to a base similar to ours. 



The reference to the Paleozoic genus Pecopteris will doubtless 

 be criticised on general principles, but rather than add to the 

 synonymy I have thought it best to adhere to the name last used 

 by Dr. Newberry. 



In grayish sandstone, Walsenberg (?),* Colo. 



Stenopteris (?) cretacea sp. nov. 



General form of frond unknown, but apparently large and 

 strong ; each pinna or branch consisting of a broad-winged 

 rachis, with relatively remote, entire, strap-shaped pinnules, each 

 of which is traversed by a strong midvein from base to apex ; 

 secondary nervation unknown. 



The fragmentary nature of our specimen renders accurate com- 

 parison difficult and it is possible that it might equally well be 

 considered under the genus Thaumatopteris, hence the generic 

 reference is questioned. 



In reddish shaly sandstone, Florence, Colo. 



Explanation of Plates 

 Plate 3. Fig. I. Anemia robusta sp. nov. ; Fig. 2. Stenopteris (?) cretacea sp 

 nov. ; Fig. 3. Glei:henia rhombifolia sp. nov. ; Fig. 4. Gleichenia delicatula Heer 

 (?) ; Figs. 5, $a. Pecopteris (C/iei/ant/ies) sepidta Newb. (?) ; Figs. 6, 7. Anemia 

 supercretacea sp. nov. 



Plate 4. Figs. I, 2. Asplenium migmim Knowlton ; Figs. 3-6. Acrostic/ium 

 Haddeni sp. nov. ; Fig. 7. Polysti ■hum Hillsianum sp. nov. 

 New York Botanical Garden. 



* The label denoting the locality was not found, but the matrix is lithologically 

 identical with that of the Walsenberg specimens. * 



