MARYLAND GEOLOGICAL SURVEY 253

CONRAD, T. A. Fossils of the Medial Tertiary of the United States.
No. 1, 1838. [Description on cover 1839 & '40.] 32 pp. Plates
I-XVII.

(Repub.) by Wm. H. Ball, Washington, 1893.

The description of many type forms characteristically developed in Maryland.

DAUBENY, CHAS. Sketch of the geology of North America, being
the substance of a memoir read before the Ashmolean Society, Novem-
ber 26, 1838. 78 pp. 1 plate. Oxford, 1839.

(Absts.) Amer. Jour. Sci., vol. xli, 1842, pp. 195-199; Bull. Soc. Geol.
France, vol. xi, 1840, pp. 221-225.
Few general references only.

DOUGLAS, D. B. Report on the Coal and Iron Formation of Frost-
burg and Upper Potomac in the states of Maryland and Virginia.
Brooklyn (?) 1838, with map.

Results of three weeks' investigation. Gives section beginning near Westernport,
In which are enumerated twenty coal veins, ten very workable. Remarks on structure
and several analyses of coal with reference to generation of heat.

DUCATEL, J. T. Annual Report of the Geologist of Maryland.

1837. [Annapolis, 1838.] 8vo. 39, 1 pp. and 2 maps.

Md. Pub. Doc., Dec. Sess., 1837.

Includes discussion of the geology of Kent, Cecil and Montgomery counties, with
remarks on coal in Frederick County.

LOOMIS, ELIAS. On the Variation and Dip of the Magnetic Needle
in different parts of the United States (with map).

Amer. Jour. Sci., vol. xxxiv, 1838, pp. 290-307.

Many observations and records, including some made in Maryland.

MACKUBIN, GEO. Report of the Treasurer of the Western Shore to
the House of Delegates, Respecting the Expenses incurred in making
the Geographical and Geological surveys of the State. 8vo. 3 pp.
[Annapolis, 1838.]

Md. Pub. Doc., Dec. Sess., 1837.

SILLIMAN, B. Extracts from a report made to the Maryland Min-
ing Company, 1838.

WAGNER, WILLIAM. Description of five new Fossils, of the older
Pliocene formation of Maryland and North America. (Read Jan.

1838.)

Jour. Acad. Nat. Sci., Phila., vol. viii, 1838, pp. 51-53, with one plate.
Describes and figures Pecten marylandicus, Venus inoceriformis, Trochus eboreus
from Maryland, Panopea goldfusi, Mysia nucleiformis from North Carolina.