Reprints of articles published in the Proceedings of the Academy of Natural Sciences of Philadelphia and various other periodicals, and gathered by the author. Vols. 1-2 issued with t.p. and table of contents. Vol. 3, pt. 1 has caption title only ("Notes on American land shells, vol. III, pt. I" above the first article); this part contains 4 article; for list, see Bulletin of the Museum of Comparative Zoölogy, v. 5, no. 16 (Dec. 1879). No more published after v. 3, pt. 1 Vol. 2 originally issued in 4 pts., May 1874-Aug. 1875 [i.e. Mar. 1876]; pts. 1 and 3 extracted from the Proceedings of the Academy of Natural Sciences of Philadelphia, 1874-1875; pts. 2 and 4 reprinted from the Annals of the Lyceum of Natural History, v. 11, 1874-1875 Includes bibliographical references v. 1. 1856-1874 -- v. 2. 1874-1876 -- v. 3, pt. 1. [1876-1879] MOLL copy 39088013492491: vol. 1 and vol. 2, pt. 1-2 bound together