312 MKSO/OIC ILOKAS OF rMlKD >rATi;.s. 



Xaoeiopsis MdXTAXEXSis Foiitaiiio n. sp. 



PI. LXXIII. Fiji. 1(1. 



A siiiulo imprint of a nearly (Mitire leaf with the rovorso was found 

 in the (icv.-^ei- beds that seeni.s to be a new Xageiopsi.s. It is 2 cm. loiifz; 

 and 8 nun. wide in its widest portion. Its shape is elHplicil witli an 

 obtu.se tip, and it nari'ows at tlie base to a pecUcel. The ner\es at tlie 

 base of the leaf are sometimes once forked and sometimes sinuie. They 

 sjo nearly paralUd to the tip of the leaf, where they are moi'e crowded, 

 but do not ('onverge as in Podozamites. There is not enough material 

 to determine certainly whether or not this is a new species of Nageiopsis, 

 but I provisionally so regard it. It is like some of the leaves of N. 

 zamioides Font., of the Potomac of \'irginia, but is more obtuse and 

 narrows to th(> ba.se more gradnall\' and more decidedly than the leaves 

 of that plant. 



Family PIXACE.F]. 



Oomis LAIIK'OPSIS Fontaine. 



Ij.\I!1( orsis i.o.NdU'oi.iA LATiFOLiA Fontaine n. var. 



PI. I>XX111. Fios. 11 11. 



1>!9S. Larinipvi-t long {folia Fonl.^ in Weed & Pirs.son : lM<;lileentli Ann. Rc^pt. U. S. 

 Geo!. Snrv.. ls<)fi-<)7. Pi. Ill, p. 482. (PI. LXXIII, Fi<;. II.) 



A large niunbei' of impiints of a conifer with nanow thread-like 

 leaves occur in the Geyser specimens collected by Professor Ward and 

 several in those obtaineii by Mi'. Weed from the (Jrafton locality. They 

 have the character of Laricopsis loitgifolia I'\)nt., a plant characteristic 

 of the Lower Potomac of Virginia. The leaves, howevei-, have on an 

 average a greater width, l)eing 1 mm. in width, while in the Virginia 

 fossil they average only half as much. This greater width may, however, 

 be due to the better preservation of the Montana specimens. The shale 

 which carries these Montana iinj)rints is very fine grained and shows 

 the entire original width of the leaflets. The Virginia rock material 

 is coarser, and the leaves whose imprints are shown on it appeal' to 

 have suffered somewhat from maceration, which may have dimin- 

 isheil theii' apparent width. But notwithstanding the sharpness of 

 outline shown in the .Montana specimens, the nerves are very obscure 

 and not iiK^'c distinctly shown than in the ^'irginia forms. There 

 appears to be one in each leaf. The leaves are attached singly or in 



