MARYLAND GEOLOGICAL SURVEY 243

CONRAD, T. A. On the Geology and Organic Remains of a part of
the Peninsula of Maryland.

Jour. Acad. Nat. Sci. Phila., vol. vi, pt. 2, 1830, pp. 205-230, with two
plates.

Appendix contains figures of 29 new species of fossil shells noticed in the preceding
pages. Describes the geological occurrence at St. Mary's, Charlotte Hall and Piscat-
away and correlates with London clay, upper Marine.

———— Description of Fifteen New Species of Recent and Three
of Fossil Shells, chiefly from the Coast of the U. S.

Jour. Acad. Nat. Sci. Phila., vol. vi, 1830, pp. 256-268, plate.
Includes Cardiura laqueatuin, Area maxillata (cast), Venus alveata.

MORTON, SAMUEL G. Synopsis of the Organic Remains of the Fer-
ruginous Sand Formation of the United States, with Geological
remarks.

Amer. Jour. Sci., vol. xvii, 1830, pp. 274-295; vol. xviii, 1830, pp. 243-250.

Remarks on the section of the Deep Cut of the Chesapeake and Delaware Canal,
with brief description of several fossils and references to Algonlum from the green-
sand below Annapolis (p. 228).

SHEPARD, C. U. On the Mineralogical and Chemical characters
of Deweylite [etc.]

See Tyson, P. T. 1830.

TYSON, PHILIP T. Notice of some Localities of Minerals in the
counties of Baltimore and Harford, Md., with an Appendix by C. U.
Shepard (on Deweylite).

Amer. Jour. Sci., vol. xviii, 1830, pp. 7S-S4.

Localities for the following minerals are given: Fine-grained dolomite, chalcedony,
tourmaline, precious garnet, common garnet, white augite, talc, magnesian hydrate of
silica, precious serpentine, compact asbestus, flexible asbestus, graphite (lamellar),
pyritous copper, iron pyrites and magnetic oxide of iron. The appendix by Charles U.
Shepard is "On the Mineralogical and Chemical character of Deweyllte and the prob-
able identity of Magnesian hydrate of Silica with this species," pp. 81-84.

1831.

ANON. Fifth Annual Report of the President and Directors to the
Stockholders of the Baltimore and Ohio Rail Road Company. 8vo.
130 pp. 1831.

Folded map and profile of the route of the B. & O. from Baltimore to Point of
Rocks; and of the lateral road to Frederick. Second Annual Report of the Chief
Engineer.

Map of a route from Baltimore to Washington.

BRONGNIART, ALEX. Rapport sur un Memoire de M. Dufresnoy,
Ingenieur des Mines, ayant pour titre: Des Caracteres particuliers
que presente le terrain de Craie dans le Sud de la France et sur les
pentes cles Pyrenees. Fait a l'Acad. roy. d. Sci., Apr. 1831.