Geology and Natural History. 227 
part includes Reports on Insects by W. L. ee C. R. Osten 
Sacken, H. A. Hagen; on Crustacea by S. L Smith and A. 8. 
Packard ; on the methods of Topographical Baers as James T. 
Gardner; Topographical Report on the Middle Park Division by 
S. B. Ladd, and on the Gold Hill Mining Region, by A. R. Mar- 
vine. A further notice is reserved to another number. 
(2.) Bulletin, Second Series, No. 1, 48 pp. 8vo, 1875.—Con- 
tains memoirs ee e Fishes of the Tertiary shale of the South 
Park, b Cae On the Cranial and Dental Characters of 
Mephitine, with description of M. 4A pesnrci a new species from the 
bone-caves of Pennsylvania; Ancient ruins in Southwestern Col- 
orado, by W. H. Jackson, with four lasena” on fossils from near 
the eastern base of the Rocky Mountains, west of Greeley and 
Evans, Colorado, and others from about 200 miles farther east, 
with descriptions of a few new spec 
(3.) Contributions to the Fossil Flora of the Western Territories. 
Part 1, The Cretaceous Flora ; by Lo LesquerEux. 136 pp. 
8vo, with 30 lithographic plates., "Vol. vi. of the Reports. rts.—Mr. Les- 
quereux has here brought out the results of his long and careful 
study of the Cretaceous flora of the Rocky Mountain region. 
The plants pe are from the Dakota group, the lowest of 
The fi 
the Cretaceous beds in that region. acts show that the 
leaves lie near rile ere they were dropped. ee ae are be- 
tween the parallels of 39° and 47°; and the leaves indicate a 
general uniformity of climate over thbbe stl with perhaps a 
slightly warmer temperature in Kansas, where alone occur the 
dne Domb 
genera Credneria, Pterospermites and Dombeyopsis ; where the 
species of Liclidassibon, and of some other eager ave mae 
leaves, while those of the Nebraska species are sma c 
ing been identified by him from beds in latitude 0 ; while from 
the Lower babi he has made out a very different ran is Jy of 
Species, including 9 Cycads, 3 uisetacee, 17 Coni, ee 
od, 5 Monoe 
Besides the genera apr enumerated, Lesquereux hast the fol- 
—— Ficus, Nyssa, Laurus, Laurophyllum, Persea, Cinnamo- 
mum, Oreodaphne, Proteoides, Embothrium, Aristolochites, An- 
