snowlton.] DESCRIPTION OF SPECIES. 31 
Glyptostrobus? sp. 
PI. V, fig. 4. 
The material from the Dutton Greek coal mine contained the single 
small branch figured. Unfortunately, since the drawing was made the 
Specimen has been lost, having been thrown away by an attendant. 
[n view of the uncertainty, I have not attempted specific identification, 
md simply present this note and the drawing, which was fairly accurate, 
ts an indication that a Glyptostrobns, or possibly a Sphenolepidium, 
vas present at this locality. Its proper identification must remain 
or subsequent investigators. 
Habitat. — Coal mine on north fork of Dutton Creek, near old stage 
oad, Laramie Plains, Wyoming. (Specimen lost.) Collected by 
Inowltou, Stanton, and Knight, July, 1896. 
Ginkgo laramiensis Ward. 
PI. IV, figs. 7-10; PI. V, fig. 5. 
rinkgo laramiensis Ward, Science, Vol. V, June 19, 1885, p. 496, fig. 7. (1885); Syn. 
Fl. Lar. Gr., p. 549, PI. XXXI, fig. 4 (1886); Types Lar. Fl., p. 15, PI. I, fig. 4 
(1887). 
This species, as Professor Ward has pointed out, is undoubtedly 
ery closely related to Ginkgo adiantoides (Ung.) Heer, the main dif- 
ference being in size, the leaves of G. laramiensis ranging from 30-40 
im. to 60-70 mm. in width and those of G. adiantoides from 75 mm. 
90 mm. They are, moreover, not so abruptly narrowed to the peti- 
le, being more nearly wedge-shaped than G. adiantoides. In outline 
he leaves of this species differ among themselves, as do the leaves 
if the living G. biloba. Thus, fig. 5 of PI. Vis wedge-shaped at base 
nd is simply lobed, while fig. 10, from the same place, is reniform, with 
ndulate or merely crenate borders. 
Habitat. — Point of Rocks, Wyoming. 
PlSTlA CORRTJGATA Lx. 
'istia comif/ata Lx., Ann. Rept. U. S. Geol. and Geog. Surv. Terr. 1874, p. 299 
(1876); Tert. Fl., p. 103, PI. LXI, figs. 1, 3, 4, 6, 7 (1878). 
The recent collections contain a few fragments of this plant, but do 
ot add anything to our knowledge of its life history, which has already 
een well characterized by Lesquereux. 
The two leaves referred by Lesquereux (Tert. Fl., p. 102) to Lemna 
nitata Dn., have been carefully reexamined. The smaller one (PI. LXI, 
g. 5) is undoubtedly nothing but a small leaf of Pistia corrugata, as 
chenk has already suggested, 1 while the larger petiolate leaf (op. cat., 
1 g. 2) is clearly a Nelumbo, and is described and illustrated in its proper 
i Systematic position (ante, p. 53). It is clearly similar to Brasenia 
' Zittel, Handbuch d. Palseontol., Abth. II, p. 378 (1890). 
