Number — 3 
A 
$ MONOGRAPH 
OF THE 
FRESH-WATER UNIVALVE MOLLUSCA 
OF THE 
UNITED STATES. a 
(IN CONTINUATION OF PROF. 8. 8. HALDBMAN’S WORK, PUBLISHED 
UNDER THE ABOVE TITLE.) 
By GEORGE W. TRYON, Jr. 
TURBIDA. 
PHYSADA. 
PHILADELPHIA: 
Published by 
"Tae ConoHoLoaricaL Sxcrion OF THE ACADEMY oF NATURAL SorENogs, 
N. W. corner of Broad and Sansom streets. 
W YORK: 
LONDON: 
B. Waiteoaen & Co., 440 Broadway. Trubner & Co., 60 Paternoster Row. 
BERLIN: MADRID: 
Asher & Co., 20 Unter der Linden. C. Bailly-Bailliere, Calle del Principe. 
Bee ze 
PARIS: 
J.B. Bailliere et Fils, Rue Hautefeuille. 
