WHITE.] NOTES ON CHARACTERISTIC SPECIES. 905 



distal margin. Tbie latter appears .slightly creuulate. The distinctly 

 cuneate form and small size of this species, which is intermediate to 

 the broad W. elegans on the one hand and the lineate IH Cainj.>h^lli on 

 the other, readily separate the leaf from those of other species in the 

 genus. From a stratigraphic standpoint this type appears to ])e one 

 of the most important, since it seems almost exclusively contined to a 

 small vertical range above the level of the Sewanee coal. 



The representatives of this species in the anthracite tield are from 

 the roof of Lykens coals 2 or 3 at the New Lincoln colliery. 



AVhittle.seya Campbelli sp. nov. 

 PI. CXC, Figs. 9, 10, 11. 



Leaves ver}^ small, linear or slightly oblong-linear, 12 to 22 mm. 

 long, 2.2.5 to 5 mm. wide, generalh' 12 to 15 mm. long and 2.5 to 2.75 

 mm. wide, often very slighth' cuneate, straight or slightly arched later- 

 ally, acuminate at the rapidly contracted base, the lateral borders 

 nearly parallel from a point less than one-fourth of the way from the 

 base upward to verv near the truncate, acutely though very obscurely 

 denticulate apex, where they normally converge somewhat, the outer 

 teeth being inclined inward and usually crowded against or overlapping 

 the interior teeth; texture densely fibrous, thick, more or less dis- 

 tinctly rounded-ribbed b}" 3 to 5 longitudinal, parallel, finely lineate 

 ridges produced by the ver}' thick contiguous fascicles of nerves, each 

 of the dense, broad fascicles entering a tooth ; petiole filamentoid, lax, 

 very faintly striate, blending with the slighth" thickened margins 

 of the acuminate base of the leaf; nervation distinct, dividing at or 

 near the base in 3 to 5 or 6 close, greatly thickened fascicles, giving the 

 leaf a parallel-ribbed and striated surface, the nerves of each fascicle 

 being slightly connivent in one of the apical teeth of the leaf. 



The species described above is one of the most widely distributed 

 plants in the Pottsville series, in which it ranges horizontally from 

 northern Ohio and northeastern Pennsylvania to the overlap of the 

 Cretaceous in Alabama, and vertically from near the base of the Potts- 

 ville to the base of the main upper plexus of conglomerates. So far 

 as is yet known, this species was the earliest of the representatives 

 of its genus to appear, it being found, in the deepest section of the 

 Appalachian Basin, nearly 1,000 feet Ijelow the levels of WhJttleseya 

 elegans or W. inicrophylla,, and several hundred feet lower than any of 

 the other closely related, more or less linear forms. 



In general it presents a great uniformity in its features, there being 

 no marked variation in either form or size among the abundant 

 examples which are to be found at nearly every locality. Some modi- 

 fications are, however, to be seen in the course of its vertical range, as 

 well as in its local development. Thus the oldest observed forms were 



