DESCRirTlON OF TUB SPECIES. KdS 



and size ii ascending towards the .sumniit of the principal pinnic, having a 

 (Ustinctly winged rachis, and terminating in a variously shaped segment 

 formed of united pinnules or lobes, usually three in number; ])iiniules very 

 variable in size ancl shape, mostly long, ribbon-shaped, slightly narrowed to 

 the base and attached by the entire base, decurrent, and united to form a 

 wing, cut very obliquely into a few lobes of varying depth, which are 

 elongate-oblong or narrowly ovate in sha^^e, and nearly always placed on 

 the posterior margin of the pinnule. The lobes toward the summit of the 

 pinimles pass sometimes into acute triangular teeth, which are turned out- 

 wards. The pinnules at the summit of the ultimate pinna- pass into more or 

 less united lobes, which vary a good deal in shape, being sometimes much 

 narrowed and even wedge-shaped at base, and incised into a varying num- 

 ber of irregularly shaped teeth ; nerves of the pinnules departing from a 

 short mother nerve at the base of the pinnules, forming three branches, 

 these diverging slightly in a flabellate manner; branches very long, slender, 

 but distinct, outer branches simple or once or twice forked, the inner one 

 forking several times and approaching the character of a midnerve ; leaf- 

 substance thick and leathery. 



Locality : Fredericksburg ; rare. 



This splendid but very peculiar fossil unites some of the features of 

 Zamiopsis with some of those of Ctenoptcris. It really stands intermediate 

 to typical forms of these two genera. It also shoAvs some of the features 

 of Srhi'optcris, and it hence belongs to quite a comprehensive type of plants. 

 As the nervation is not essentially different from that of Zamiopsis, it seems 

 best to place it provisionally in that genus. 



The plant is a remarkable one. In its pinnules and longer lobes, so 

 far as the shape goes, it reminds one of Saporta's Stenopteris desmomeru, but 

 the nervation is very different. Some of the pinnules towards the tips of 

 the lower ultimate pinna- are naiTOwly stra})-sliaped, and show a very con- 

 siderable length Avitliout an}- lobing or toothing. lUit as the tips of these 

 are wanting, it is possible that thoy niay possess teeth up higher. Figure 

 G, the upper portion of an ultimate pinna, and also Figs. 5, 7, show how 

 irregular the toothing and shape of the pinmdes, here reduced -to lobes, 

 become in the terminal portions of the ultimate pinnae 



