134 LAND AND FRESH WATER MOLLUSKS 



Quadrula lachrymosa Lea. 



Unto lachrymosus LEA, Trans. Am. Phil. Soc., in, p. 272, pi. vi, fig. 8, 1827. 

 Unio asperrimus LEA, op. '/., iv, p. 71, pi. v, fig. 3, 1831. 

 Unto quadrulus SAY, Am. Conch., vi, pi. LIII, 1834 ; not of Rafinesque. 

 Quadrula lachrymosa SIMPSON, Synopsis, p. 776, 1900. 



Range. Entire Mississippi drainage; various localities in the St. 

 Lawrence system ; Red River of the North, Manitoba, abundant. 



Quadrula rubiginosa Lea. 



Unio rubiginosus LEA, Trans. Am. Phil. Soc., in, p. 427, pi. vin, fig. 10, 



1829. 

 Unio flavus CONRAD, 1834. SAY, Am. Conch., vi, 1834. CONRAD, Mon., 



ix, p. 74, pi. xn, fig. 2, 1837. 

 Unio trigonus SOWERBY, Conch. Icon., Mon. Unio, xvi, pi. LXIV, fig. 322, 



1868. 

 Quadrula rubiginosa SIMPSON, Synopsis, p. 786, 1900. 



Range. Entire Mississippi drainage ; eastern Texas ; St. Law- 

 rence drainage ; Red River of the North ! Manitoba ; Nelson River ! 

 Keewatin ; Red and Roseau Rivers and Lake Winnipeg, Manitoba. 



Family SPRERIIDJB. 



This family is reviewed in Trans. Wagner Institute, vol. in, part 

 vi, pp. 1439-60, and a summary of the arrangement adopted is also 

 given in Proceedings Biological Society of Washington, xvi, pp. 5-8, 

 1903. This arrangement in effect is that which is adopted on the 

 present occasion. The specific synonymy is mainly due to the late 

 Temple Prime, who kindly named the Alaskan specimens collected 

 previous to his death. Some later arrivals have been examined by Dr. 

 Sterki. I have seen no specimens or figures of the species from Port 

 Clarence named by Westerlund, and they are introduced on his author- 

 ity. It is probable that a considerable reduction will eventually be had 

 in the number of nominal species, especially of Corneocyclas. 



Genus Sphaerium Scopoli. 

 Subgenus Sphaerium s. s. 



Sphaerium simile Say. 



Cyclas similis SAY, Nicholson's Encycl., ist Am. ed., pi. I, fig. 9, 1817. 

 Cyclas sulcata LAMARCK, Anim. s. Vert., v, p. 560, 1818. 

 Sphcerium sulcatum PRIME, Mon. Am. Corbie., p. 33, fig. 25, 1865. 



Range. United States, east of the Mississippi River; Canada; 

 Manitoba. 



Lake Superior ; Red River of the North ; Lake Winnipeg ; Pine 



