310 MKSOZOIC FLORAS OF FNITFO STATES. 



tana beds. This foi-ni of cycad, which is so highly cliaracteristic of the 

 Lower Cretaceous. (Uffers in so many essential points from the Zamites 

 of the Jurassic, wliich find their type in Z. Feneonis (Brong;n.) Ung., 

 that it does not seem pi-oper to miite them in one genus. If ever plants 

 are to be made generically different from characters of foliage, it would 

 seem that the Jurassic and Lower Cretaceous types of so-called Zamites 

 ought to l)e so considered. As the form of the Lower Cretaceous is 

 always and markedly pectinate in shape, Pectmizamites would appear 

 to l)e a proper generic name. 



Mr. AYeed's collection contained a few forms of a Zamites that 

 seemed from the imperfect specimens obtained to be new, and the name 

 Zamites Weedii was proposed for it in the preliminary report. These 

 are represented in PL LXXIIL Figs. 1 and 4. This collection showed 

 also one or two imprints of a smaller Zamites, which, in the same report, 

 was supposed to he a different species and compared with an minamed 

 Zamites of Dawson from the Kootanie of Canada. The numerous speci- 

 mens of Z. ardicus above described show that l)oth of these forms fall 

 easily within the limits of variation of that species, and hence they 

 must be regarded as identical with it. 



PL LXXin, Y'lg. 1, represents the .basal portion of one of the 

 leaves, with wider leaflets, and shows the shortening of the leaflets 

 toward the base. Xo doubt lower down on the leaf the leaflets are 

 wanting, giving a naked petiole. Fig. 2 shows a fragment of a leaf 

 from its middle portion, with leaflets of the larger size, Ixit not quite 

 so large as some that were seen. Fig. 3 represents a small fragment 

 from the middle portion of a leaf, showing some of the largest leaflets 

 seen. Fig. 4 gives a small fragment of a leaf from its middle portion, 

 showing leaflets of the smallest size. Fig. 5 represents a fragment 

 from the middle portion of a leaf that shows the narrowest type of 

 leaflets that possess an average length. Fig. 6 gives two of the leaflets 

 of Fig. 5 enlarged four diameters to show details. 



Genus CYCADEOSPERMUM Saporta. 



Cycadeospermum montanense Fontaine n. sp. 



PI. LXXIII, Fig. 7. 



A single nut -like seed wtis found in the Geyser beds, which seems 

 to l)e a Cycadeospermum, probably a new species. But there is not 



