lesqueeeux.] FOSSIL PLANTS FROM POINT OF ROCKS. 299 



ually narrowed to a point, slightly contracted to the decurrent base, 

 slightly incurved or falcate, sometimes erect and appressed to the stem ; 

 scar-leaves triangular or liugulatepointed. 



This species apparently bears two kinds of leaves, even upon the same 

 specimens; either long, two centimeters, and very narrow-linear, less than 

 one millimeter wide, or shorter and broader, decreasing gradually from 

 the base to the point, linear-lanceolate, nearly one and one-half millime- 

 ters wide and only eight to ten millimeters long; the middle nerve is 

 deeply marked upon both kinds of leaves. I should have considered 

 the numerous specimens bearing branches of this Sequoia as represent- 

 ing two species, the one with narrow longer leaves, the other with shorter 

 broader leaves. But even the difference in the length and proportion- 

 ate width of the leaves is distinctly perceivable upon one of the speci- 

 mens, and the difference also in the length of the leaves, all narrow and 

 of the same width, is evident upon auother. There are, moreover, a 

 large number of specimens, all fragmentary indeed; and the difference 

 in regard to the size of the leaves is apparent upon most of them. In 

 the average, the leaves are much narrower than those of Sequoia Beich- 

 enbachi, Heer, to which this species is related by the falcate form of 

 some of the leaves. 



Habitat.— Point of Rocks, Dr. F. V. Hayden. 



8. WlDDRINGTONIA COMPLANATA, sp. flOV. 



Stem thick, disticho-pinnate; branchlets short, thick, alternate, ob- 

 lique; leaves small, in spiral order, closely imbricate and appressed, 

 oblong-lingulate pointed upon the primary branches, ovate-pointed or 

 rhomboidal and snorter upon the obtuse branchlets. 



This species, represented by many specimens, is evidently related to 

 Widdt ingtonia antiqua (Sap. Et., 2, 1, p. 09, PI. I, fig. 4), for the form of 

 the leaves, which are, however, more closely appressed in the American 

 species, and more distinctly placed in spiral order around the branch- 

 lets. These leaves do not appear of a thick substance, the coat of 

 coaly matter over them being extremely thin. 



Habitat. — Point of Eocks, Dr. F. V. Hayden, William Clehurn. 



9. PlSTIA CORRTJGATA, Sp. UOV. 



Leaves thick, at least toward the base, varyingin diameter from two to 

 three and one-half centimeters, broadly obovate, generally bordered from 

 above the base by a wavy margin two to five millimeters broad ; gradu- 

 ally narrowed into a short pedicel about three millimeters thick, termi- 

 nating into a bundle of radicles; veins emerging from the pedicel in two 

 or three thick bundles, dividing and diverging from the base of the 

 leaves, and forming in ascending, by a kind of abnormal anastomosis, 

 irregularly polygonal meshes. 



These leaves, resembling in form a small bladder, contracted on one 

 side, seem somewhat inflated, or at least thickened, from the base to 

 above the middle, or composed of two distinct areas, the lower one cir- 

 cular and separated by a narrow groove, or deep line, from the wrinkled 

 border which surrounds it, narrowing, however, gradually toward the 

 pedicel. The areolation of this border seems disconnected and distinct, 

 representing large quadrangular areolae, whose subdivisions curve along 

 in festoons. Sometimes, however, the central part is not inflated, or 

 thicker, and in this case, as in specimens representing young leaves, no 

 traces of borders are perceivable. This groove, therefore, and the sep- 

 aration of the leaf in two distinct parts, may be caused by a kind of fold 



