I020 FRESH-WATER BIOLOGY 



174 (166) Shell thick, oval, subtrigonal, ventricose, smooth; beaks prominent; 

 ligament inclosed in a pit and invisible externally; hinge 

 with cardinal and both anterior and posterior lateral teeth; 



pallial line sinuous Family Rangiidae. 



Only one genus Rangia Des Moulins. 



The typical species, R. cuneata Gray (Fig. 1534; 

 X 12), is found in great abundance in the brackish 

 waters of the Gulf coast from Alabama to Mexico. 



Fig. 1534. 



IMPORTANT PAPERS ON FRESH-WATER MOLLUSCA. 



Baker, F. C. 1898. The Mollusca of the Chicago Area. Part I, Pelecypoda. 

 1902. Part II, Gastropoda. 



191 1. The Lymnaeidae of North and Middle America. 



BiNNEY, W. G. 1865. Land and Fresh-water Shells of North America, Part 



II. Smithsonian Misc. CoU., v. 7, No. 143, 172 pp. Part III, No. 144, 



128 pp. 

 Haldeman, S. S. 1842. Monograph of the Fresh-water Univalve Mollusca 



of the United States. Continued by G. W. Tyron, Jr., 1870. 

 Ortmann, a. E. 191 1. A Monograph of the Najades of Pennsylvania. 



Mem. Carnegie Mus., 4 : 279-347. 



191 2. Notes upon the FamiHes and Genera of the Najades. Ann. Car- 

 negie Mus., 8 : 222-364. 



Prime, Temple. 1865. Monograph of American Corbiculidae. Smithsonian 

 Misc. Coll., V. 7, No. 145, 192 pp. 



Simpson, C. T. 19 14. A Descriptive Catalogue of the Naiades or Pearly Fresh- 

 water Mussels. Printed by Bryant Walker, Detroit, Mich. 1540 pp. 



Stimpson, William. 1865. Researches upon the Hydrobiinae and Allied 

 Forms. Smithsonian Misc. Coll., v. 7, No. 201, 64 pp. 



Tryon, G. W., Jr. 1873. Land and Fresh-water Shells of North America. 

 Part IV, Strepomatidae. Smithsonian Misc. Coll., v. 16, No. 253, 435 pp. 



