THE NATURAL HISTORY SURVEY. 373 



LEA, ISAAC. Descriptions of Twenty-four new Species of Physa of the 



United States and Canada. (1. c., 1864, pp. 114-116.) 

 Descriptions of fourteen new species of Melanidae and one Palu- 



dina. (From same, 1863, pp. 154-158.) 

 .... Description of a New Genus (Trypanostoma) of the Family Melanidae, 



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. Ill, 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. Ill, pp. 259-273, 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. 253-293, 1852.) 



. . .Descriptions of the Embryonic forms of thirty-eight species of Union- 

 ids. (From Journ. Phil. Acad., Vol. IV, pp. 43-50, 1858.) 

 . . . .Observations on the Naiades, and descriptions of new species of that 



and other families. (From Trans. Amer. Phil. Soc., Vol. IV, pp. 63-120, 



1834.) 



Observations, etc., continued. (From same, Vol. V, pp. 23-85, 1837.) 



....Observations on the genus Unio, etc. Philadelphia, 13 Vols., 1834- 



1874. (Obs.) 

 New Unionidae of the United States. (From Journ. Phil. Acad., Vol. 



IV, pp. 51-94, 1858; also pp. 191-233, 1859.) 

 Synopsis of the Family of Naiades. (From the Amer. Phil. Soc., Vol. 



VI, pp. 113 et seq., 1839.) Second edition. (Syn. 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, 81-83, 237-243; Vol. IV, pp, 163-167, 1840-1845. 

 LEHNERT, E. (Leh.) Alaskan Plants and Shells. (From Science Rec- 

 ord, June 16, pp. 171, 172, 1884.) 

 LEIDY, 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.) 



