+ 
LEA, ISAAC, LL.D.—(Continued.) 
IN TRANSACTIONS OF THE AMERICAN PHILOSOPHICAL SOCIETY. 
New SERIEs. 
- These papers are all issued separately in Pamphlet, and are also contained in the 
“Observations on the Genus Unio,” §¢c.—a work in eight quarto volumes by Mr. Lea. 
Description of six new species of the Genus /Unio, embracing 
the anatomy of the Oviduct of one of them, together with some 
Anatomical Observations on the Genus.’ (Read Nov. 2, 1827.) 
Vol, iii., p. 259. 1830. (Printed Paper distributed 1828.) 
Description of a New Genus of the Family of Naiades, includ- 
ing 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. (Read March 6th, 1829.) 
Vol. iii., p. 403. 1830. (Printed Paper distributed May or June, 1829.) 
Observations on the Naiades and descriptions of new species of 
that and other Families. (Read May 7, 1830.) 
Vol. iv., p. 63. 1834. (Printed Paper distributed 1831.) 
Supplement. (Read May 20, 1881.) 
Vol. iv., p. 105. 1834. (Printed Paper distributed 1831.) 
Description of a new genus of the Family Melaniana of 
LAMARCK. (Read January 7th, 1831.) 
Vol. iv., p. 122. 1834. (Printed Paper distributed 1831.) 
Observations on the Naiades, and descriptions of new species 
of that and other Families. (Read March 16th, 1832.) 
Vol. v., p. 23. 1837. (Printed Paper distributed August or September, 183+.) 
Supplement. (Read March 15, 1888.) 
Vol. v., p. 59. 1837. (Printed Paper distributed Aug. or Sept., 1834.) 
Second Supplement. (Read February 7th, 1884.) 
Vol. v., p. 95. 1837. (Printed Paper distributed Aug. or Sept., 1834.) 
Third Supplement. (Read April 18, 1834.) 
Vol. v., p. 114, 1837. (Printed Paper distributed Aug. or Sept., 1834.) 
Description of new Freshwater and Land Shells, (Read Dee. 
19th, 1834.) 
Vol. vi., p. 1. 1839. (Issued in Synopsis, Ist edition, 1836.) 
