256 BIBLIOGRAPHY AND CARTOGRAPHY

DUCATEL, J. T. Annual Report of the Geologist of Maryland.
1840. 8vo. 46 pp. [Annapolis, 1840.] Map and sections.

Another edition, 8vo, 59 pp. and 3 plates; also Md. House of Delegates,
Dec. Sess., 1840, n. d. 8vo, 43 pp., 3 plates.

Considers the physical geography and geology of Allegany and Washington counties,
with notes on the copper mining about Frederick.

VANUXEM, L. On the Ancient Oyster Shell Deposites observed
near the Atlantic Coast of the United States. [Read April 7, 1841.]
Proc. Assoc. Amer. Geol. Nat., pp. 21-23.
Cites several observations to prove the human origin of shell heaps.

1842.

ALEXANDER, J. H. Report of the Topographical Engineer to the
Governor of Maryland. 8vo. 5 pp.
Md. Pub. Doc., Dec, Sess., 1841. (J)

CONRAD, T. A. Observations on a portion of the Atlantic Tertiary
Region, with a description of new species of organic remains.

2nd Bull. Proc. Nat. Inst. Prom. Sci., 1842; plates, pp. 171-192.

The deposits of Upper Marlboro, Piscataway and Fort Washington, Md., are referred
to the Eocene or Lower Tertiary, and correlated with the London Clay, Calcalre Gros-
sler, Claiborne beds, etc. Columnar sections and lists of fossils with many localities
along the bay.

———— Description of twenty-four new species of Fossil Shells
chiefly from the Tertiary Deposits of Calvert Cliffs, Md. (Read June
1, 1841.)

Jour. Acad. Nat. Sci., Phila., vol. viii, 1842, pp. 183-190.

———— Descriptions of new Tertiary Fossils.

2nd Bull. Proc. Nat. Inst. Prom. Sci., 1842, pp. 192-194, two plates.

Plates show Ostrea sellaeformis, Pholadomya marylandica, Pholas petrosa, Isocardla
markoel, Pecten humphreydll, Dispoteae constricta, Scalarla expausa, Bucclnum Inte-
grum, Scutella alberti (the last is not figured, but described).

EHRENBERG, C. G. Verbreitung des Mikroskopischen Lebens als
Felsmassen im centralen Nord Amerika und im westlichen Asien.

Bericht. k. p. Akad. der Wiss., Berlin, 1842, pp. 187-188.

Discusses the Polythalalmas of the Cretaceous and infers similar conditions to those
existing off Northern Africa. No direct reference to Maryland.

HARLAN, R. Description of a New Extinct Species of Dolphin
from Maryland.

2nd Bull. Proc. Nat. Inst. Prom. Sci., 1842, pp. 195-196, 4 plates.
The fossil is Delphinus calvertensis, which was found in the Calvert Cliffs.