86 Reviews — Heer’s Primceval World of Switzerland. 
> Fig. 6. , , Fig. 7. * Fig. 8. 
Fig. 6. Glyptostrobus europaius, Br. sp. (Eningen, a. Branch with a mature cone; 
b. twig with male flowers ; c. twig with divergent leaves ; d. twig with 
adpressed leaves. — Fig. 7. Taxodium distichum miocenum. a. From Hohe- 
Bhonen ; b. male flowers from Bilm. — Fig. 8. Widdringtonia Helvetica , 
Heer, from Hohe-Rhonen. a. Branch; b. closed cone; c. cone open; d. 
open cone with seeds. (Heer, Figs. 155, 156, and 158, p. 324.) 
The genus Sequoia had a wide distribution in Tertiary times from 
Central Italy and Greece up to the Arctic zone. 
Sequoia Langsdorfi is 
found fossil on the Mac- 
kenzie River, in Green- 
land, in Kamtschatka, in 
Alaska, and also in many 
European localities. This 
form is closely related to 
the redwood ( Sequoia sem- 
pervirens ) which forms 
great forests at the present 
day in the coast-range of 
California, throwing up 
stems 250 feet high. The 
Mammoth-tree ( Sequoia gi- 
gantea ) is found onlyin the 
higher Sierra, and is much 
more limited in its ränge than the other species, and is probably 
dying out, other and smaller Conifene apparently far out-numbering 
it upon its own ground. 1 It attains a height of 300-320 feet, and 
a diameter of 20-30 feet. Remains of this genus are found in the 
1 See the admirahle Address hy Prof. Asa Gray to the American Association at 
Dubuque, Iowa, in Silliman’s American Journal, 1872, 3rd series, vol. iv. p. 282. 
Fig. 9. Sequoia Langsdorfi. a. cone from 
Rixhöft ; b. longitudinal section with seed ; c. 
transverse section ; d. seed ; e. female flowers. 
From Greenland, 70° N. lat. (Heer, Fig. 158n, 
p. 329.) 
