THE NATURAL HISTORY SURVEY. ote 
Lea, Isaac. Descriptions of Twenty-four new Species of Physa of the 
United States and Canada. (I. c., 1864, pp. 114-116.) 
..Descriptions of fourteen new species of Melanidze and one Palu- 
dina. (From same, 1868, pp. 154-158.) 
.. Description of a New Genus (Trypanostoma) of the Family Melanide, 
and of forty-five New Species. (From same, 1862, pp. 169-175.) 
.. Descriptions of Twelve New Species of Uniones and other Fresh-water 
Shells of the United States. (From same, 1858, pp. 165-166.) 
..Description of Eight New Species of Naiades from various parts of 
the United States. (From same, 1857, p. 84.) 
.. Description of New Fresh-water Shells from California. (From same, 
Vol. VIII, pp. 80-81, 1856.) 
.. Description of a new genus of the family of Naiades, including eight 
species, four of which are new; also the description of eleven new 
species of the Genus Unio from the rivers of the United States; with 
observations on some of the characters of the Naiades, etc., etc. 
(From Trans. Amer. Phil. Soc., Vol. III, pp. 403-457, 1827.) 
.. Descriptions of six new species of the genus Unio, embracing the 
anatomy of the oviduct of one of them, together with some Anatom- 
ical Observations on the Genus. (From same, Vol. II], pp. 259-278, 1827.) 
.. Description of new Fresh-water and Land Shells. (From same, Vol. 
VIII, pp. 163-252, 1842.) 
.. Description of new Fresh-water and Land Shells. (From same, Vol. 
VI, pp. 1-154, 1838.) 
..Continuation of same. (From same, Vol. IX, pp. 30-34, 1841.) 
.. Description of new Fresh-water and Land Shells. (From same, Vol. 
X, pp. 67-101, 1848; also pp. 255-295, 1852.) 
.. Descriptions of the Embryonic forms of thirty-eight species of Union- 
idz. (From Journ. Phil. Acad., Vol. IV, pp. 48-50, 1858.) 
.. Observations on the Naiades, and descriptions of new species of that 
and other families. (From Trans. Amer. Phil. Soc., Vol. 1V, pp. 63-120, 
1834. ) 
... Observations, etc., continued. (From same, Vol. V, pp. 23-85, 1887.) 
..Observations on the genus Unio, etc. Philadelphia, 18 Vols., 1834— 
1874. (Ods.) 
.. New Unionide of the United States. (From Journ. Phil. Acad., Vol. 
IV, pp. 51-94, 1858; also pp. 191-238, 1859.) 
.. Synopsis of the Family of Naiades. (From the Amer. Phil. Soc., Vol. 
VI, pp. 113 et seq., 1839.) Second edition. (Sy. Fam. Naid.) 
..From the Journ. Phil. Acad., Vol. VI, 1861, p. 68; 1862, p. 196; 1868, p. 
309; Vol. VIII, 1874, p. 29, 174. 
..From the Proc. Amer. Phil. Soc., Vol. I, pp. 66, 187, 285-289; Vol. II, 
pp. 11-15, 30-34, 81-85, 257-248; Vol. 1V, pp, 163-167, 1840-1845. 
LEHNERT, E. (Leh.) Alaskan Plants and Shells. (From Science Rec- 
ord, June 16, pp. 171, 172, 1884.) 
LEeIDy, DR. JOSEPH. On Flukes infecting Mollusks. (From Proc. Phil. 
Acad., pp. 200-202, 1877. 
LEVERETT, FRANK. The Pleistocene Features and Deposits of the Chicago 
Area. (Bulletin of the Natural History Survey of the Chicago Acad- 
emy of Sciences, No. 2, 1897.) : 
