270 BIBLIOGRAPHY AND CARTOGRAPHY

1861.

CONRAD, T. A. Fossils of the (Medial Tertiary or) Miocene For-
mation of the United States. No. 4. 1861 (?). pp. 81-89, index
and plates xlv-xlix.

(Repub.) by W. H. Dall, Washington, 1893.

Original descriptions of several Maryland forms.

HALL, JAMES. Paleontology. Vol. Ill, Part I. Geological Sur-
vey N. Y., Albany, 1861. Containing Descriptions and figures of
the Organic Remains of the Lower Helderberg group and the Oriskany
Sandstone. 1855-1859.

Description and figures of numerous forms from Cumberland and vicinity.

JOHNSTON, CHRISTOPHER. Upon a Diatomaceous Earth from Not-
tingham, Calvert Co., Maryland.

Proc. Amer. Assoc. Adv. Sci., vol. xiv, 1860, pp. 159-161.

Shows that " Bermuda earth " must have come from this deposit or its southward
prolongation. Corroborative letters by A. M. Edwards and Chas. Stodder.

NORMAN, GEORGE. On some Undescribed Species of Diatomaceae.
(Read Nov. 14, 1860.)

Trans. Microscopical Soc. of London, n. s. vol. ix, 1861, pp. 5-9.
Describes and figures Aulacodiscus solllitiauus (n. sp.) from Nottingham, Mary-
land, (p. 7.)

ROGERS, W. B. Infusorial earth from the Tertiary of Virginia
and Maryland. (Read May 4, 1859.)

Proc. Boston Soc. Nat. Hist., vol. vii, 1861, pp. 59-64.

Refers more particularly to Virginia localities, but considers them as types of Mary-
land exposures.

TRYON, GEO. W., JR. List of American Writers on Recent
Conchology. New York, 1861. 8vo. 68 pp.

The author gives a bibliography of the works of these writers, which includes many
references to Maryland.

TYSON, P. T. [Letter from Mr. Tyson of Maryland on Tripoli.]
(Read Dec. 1860.)

Proc. Acad. Nat. Sci., Phila., vol. xii, 1861, pp. 550-551.

Describes occurrences and distribution of " Tripoli," which he considers Miocene.

WHEATLEY, CHARLES M. Remarks on the Mesozoic Red Sand-
stone of the Atlantic Slope, and notice of the Discovery of a Bone
Bed therein at Phoenixville, Penn.

Amer. Jour. Sci., 2nd ser., vol. xxxii, 1861, pp. 41-48.