44 C O N TR I B UT I O N S TO PAL^ONTOLOGY 



Family SCHIZiEACEyE 



Genus ANEIMIA Swartz 



Aneimia sp. 



(Plate 1, Fig. 8) 



The single unsatisfactory specimen figured is the only one of this form in the coUections. 

 It is clearly quite different from the other ferns but is unfortunately lacking in the characters 

 essential for reliable identification. 



The size, shape, and arrangement of the pinnules seem to relate this form to several recorded 

 fossil species of Aneimia (usually misspelled Anemia). It differs from A. elongata (Newberry) 

 Knowlton, from the Laramie and Mesaverde formations of Colorado and Wyoming,' only in 

 possessing crenate rather than coarsely toothed margins. It is equally close to A. mosbeyensis 

 Ivnowlton from the Dawson formation ^ and A. siipercretacea HoIIick from the Vermejo.' The 

 marginal crenations are also apparently the main difference between our specimen and the figure 

 of A. occidentalis Ivnowlton from the Raton formation.'* I believe that if large, complete speci- 

 mens of any of these species could be collected they might conceivably show all of the variations 

 on a single frond which at present are considered specific differences. 



The i'eference of all of the specimens cited to the genus Aneimia seems open to question. 

 In so far as leaf morphology is concerned they might equally well be referred to Asplenium, Poly- 

 ■podium, or Pteris. In the absence of diagnostic fruiting structures, however, it is impossible to 

 attempt a more accurate determination. 



Occurrence — Corson Ranch, Wyoming, Loc. P. 371. 



Collection—V. C. Mus. Pal., No. 1292. 



FamDy EQUISETACE.E 



Genus EQUISETUM Linn6 



Equisetum sp. 



(Plate 1, Figs. 9, 13) 



The coUections contain a half dozen specimens which consist in part of ribbed, jointed stems 

 and in part of tubers connected with jointed stems. The preserved characters do not seem to me 

 to be sufficiently diagnostic to attempt a specific determination. The reference to Equisetum, 

 however, seems rather certain. 



There appear to be very few figured specimens of comparable jointed stems from the late 

 Cretaceous or early Tertiary of the Rocky Mountain region. It may be that our specimens might 

 be comparable to several forms from the Lance or Denver, which are, unfortunately, listed simply 

 as Equisetum sp.,^ and not figured. The tubers, on the other hand, are very similar to those of 

 Equisetum perlcevigatum Cockerell from the Laramie formation of Colorado.^ Close resemblance 

 of such generahzed portions of plants as underground tubers does not, however, seem to justify 

 their being considered conspecific, or their being used for correlation purposes. 



Occurrence — Corson Ranch, Wyoming, Locs. P. 371, P. 372. 



Collectio7i—\J . C. Mus. Pal., Nos. 1293, 1294. 



> Knowlton, F. H., U. S. Geoi. Surv. Prof. Paper 130, 112, pl. 2, fig. 2, 1922. 



» Knowlton, F. H., U. S. Geol. Surv. Prof. Paper 155, 28, pl. 8, fig. 9, 1930. 



' Knowlton, F. H., U. S. Geol. Surv. Prof. Paper 101, 248, pl. 30, fig. 5, 1917. 



* Knowlton, ibid., 285, pl. 54, fig. 2. 



' Knowlton, F. H., U. S. Geol. Surv. BuII. 696, 259, 1919. 



« Knowlton, F. H., U. S. Geol. Surv. Prof. Paper 130, 113, pl. 1, figs. 8, 9, 1922. 



