G2 THE NAUTILI S. 



authority in each of these branches, especially as they related to 

 Chester county. The latter science, however, finally engrossed Hart- 

 man's attention ; and it is by his work on mollusca that he became 

 most widely known. For over forty years he corresponded upon 

 conchological topics with tlie leading authorities in the science in this 

 country and abroad. Among his correspondents and co-laborers were 

 Isaac Lea, LL. D., of Philadelphia ; Charles Wheatley, of Phcenix- 

 ville ; George W. Tryon, Jr., J. G. Anthony, Dr. J. C. Cox, Andrew 

 Garrett, W. H. Pease, E. L. Layard and many others. 



Through Mr. Garrett lie obtained what is perhaps one of the finest 

 collections of Polynesian land shells in the world, especially of the 

 genus Partula, of which he described 25 species. The critical study 

 of the genus Partula particularly engaged his attention during several 

 years; and his careful work and extensive writings on the group, 

 have given him high rank as an authority thereon. His beautiful col- 

 lection of AchatineUidcs was purchased by the Bremen Museum some 

 time before his death. The last conchological work that Dr. Hart- 

 man undertook was a revision of the Helicinidce. He gathered much 

 interesting material, but tailing health prevented the carrying out of 

 his intentions. His collection of marine shells is rich in Polynesian 

 species and contains many varieties. 



One of the best known publications from the pen of Dr. Hart man 

 was " Conchologia Cestrica," treating of the mollusca of Chester 

 county, Pa. In its preparation he was associated with the late Dr. 

 Ezra Michener, of New Garden township, but Dr. Hartman did the 

 larger part of the work. It is illustrated with 207 wood-cut figures 

 of shells described in the work. This book, published in 1.S74, was 

 formerly used as a text-book in many schools in Chester and Dela- 

 ware counties. 



He was also the author of the following papers : 



Opercula of the family Strepomatidae. Amer. Jour. Conch, vi, 

 316, 1871. 



Description of a Partula supposed to be New, from the Island of 

 Moorea. Proc. Acad. Nat. Sci., Phila., 229, 1880. 



A catalogue of the genus Partula Fer. (privately printed in West 

 Chester), 1881. 



Observations on the species of the genus Partula Fer., with a 

 Bibliographical Catalogue of all the species. Bull. Mus. Comp. Zob'l. 

 ix. No. 5, pp. 171-190, 1882. 



