knowlton.] DESCRIPTION OF SPECIES. 55 
to have been approximately circular in outline, being about 17 mm. in 
diameter. It is peltate, but not quite centrally so, and appears to have 
had numerous radiating ribs, which apparently forked near the nyddle. 
They are so faintly preserved that it is quite impossible to count them. 
The finer nervation can not be made out. 
This little leaf belongs without much doubt to Nelumbo, but it is so 
poorly preserved that I have hesitated to give it a specific name. It is 
smaller and seems to have had a greater number of ribs than N. inter- 
media, but this is obscure. They may possibly be the same. 
Habitat. — Point of Rocks, Wyoming. 
Castalia? duttoniana n. sp. 
PL XIII, fig-. 7. 
Castalia n. sp. Kn., Bull. Geol. Soc. Am., Vol. VIII, p. 140 (1897). 
Leaf of firm texture, nearly circular in outline, slightly heart-shaped 
at base, rounded above; midrib thin, irregular, tlexuous, with several 
forks or branches above; secondaries palmate, about three pairs on each 
side, of equal strength, arising at the apex of the petiole, two or three 
times forked, the ultimate branches uniting to form irregularly polygo- 
nal meshes or areas of various sizes, the outer series or row apparently 
entering the margin; finer nervation obscure, but apparently reticu- 
ated. 
Besides the leaf figured, with its counterpart, there is only one other 
fragment that can be referred to this form. The leaf is nearly cir- 
cular, being about 4.75 cm. in length and 5 cm. in width. It is very 
obtuse and rounded at the apex, and is slightly but plainly heart- 
shaped at the base. The margin is perfectly entire. The petiole is long 
and slender. 
Habitat. — Near old stage road on north fork of Dutton Creek, between 
Rock and Cooper creeks, Wyoming. Collected by Knowlton, Knight, 
and Stanton, July, 189G. 
Magnolia tenuinervis Lx. 
PI. XIV, fig. 1. 
Magnolia tenuinervis Lx., Am. Jour. Sci., 2d ser.,Vol. XLV, p. 207 (1868); Ann. Rept. 
U. S. Geol. and Geog. Surv. Terr. 1869, p. 96 (1869) [Reprint 1873, p. 196] ; ibid., 
1870, p. 383 (1872); ibid., 1876, p. 518 (1878); Tert. Fl., p. 249, PI. XLIV, figs. 
5, 6; PL XLV, figs. 1-5 (1878); Cret. and Tert.FL, p. 124, PI. XIX, fig. 6 (1884); 
Bull. Mus. Comp. Zool., Vol. XVI, p. 53 (1888). 
HaynoUa Inglefeldi Ileer, Lesquereux, Ann. Rept. U. S. Geol. and Geog. Surv. 
Terr., 1872, p. 196 (1873). 
All but two of the type specimens of this species as figured in the 
Tertiary Flora are preserved in the United States National Museum; 
but there appears to have been some confusion as to the localities from 
which some of them came. Thus, the original of fig. 3 (Tert. Fl., PI. 
XLV) is recorded in the Museum catalogue as coming from Golden, 
