FAMILY VIVIPARID^ 1 25 



Campeloma decisum Say. 



Limnaa decisa Say, Nicholson's British Encyclopedia, 1st Am. ed., pi. in, 



fig. 6, 1817. 

 Paludina decisa Say, op. cit., 3d ed., pi. in, fig. 6, 18 19. — Haldeman, 



Mon. Limn., Paludina, p. 4, pi. 1, 1840. 

 Melantho decisa Binney, Land and Fw. Sh. N. Am., in, p. 41, figs. 79-82. 



1865. 



Range. — Eastern North America from the Rio Grande to Nova 

 Scotia, west to Nebraska, north to the Saskatchewan. Lake Superior 

 to the Saskatchewan (Richardson) ; Lake of the Woods, Manitoba, 

 (rare, Hanham). 



It is not unlikely that the extension of the range of this species as 

 far north as the Saskatchewan is unwarranted, so many of the data in 

 Sowerby's list, in Richardson, seem erroneous, but the presence of the 

 species in the Lake of the Woods seems authentic. 



NAIADES. 



In discussing the Naiades, the arrangement proposed by Mr. Chas. 

 T. Simpson, in his recent Synopsis of the Naiades, 1 is adopted, which 

 see for fuller synonymy. 



Genus Lampsilis Rafinesque. 



Lampsilis ventricosus Barnes. 



Unio ventricosus Barnes, Am. Journ. Sci., 1st ser., vi, p. 267.pl. xin, fig, 



14, 1823. 

 Lampsilis ventricosus Simpson, Synopsis, p. 526, 1900. 



Range. — Entire Mississippi drainage, the St. Lawrence system, 

 southern drainage into Hudson Bay. 



Lake Winnipeg; Battle River, Manitoba, and north to Nelson 

 River ! and its tributaries, in north latitude 57 . 



Lampsilis luteolus Lamarck. 



Unio luteola Lamarck, Anim. s. Vert., vi, p. 79, 18 19. — Sowerby, Conch. 



Icon., xvi, Mon. Unio, pi. lviii, figs. 293, a-b, 1867. 

 Lampsilis luteolus Simpson, Synopsis, p. 534, 1900. 



Range. — Entire Mississippi drainage and southwest to the Brazos 

 River, Texas ; entire Dominion of Canada east of the Rocky Moun- 

 tains and north to the Red River of the North ! 



Lake Winnipeg ! Lower Saskatchewan ! Battle River, Manitoba. 

 Hill River, Keewatin ! (var. superiorensis Marsh) . Great Slave 

 Lake ! Lake Athabaska ! Moose Factory, James Bay ! Manitoba Lake. 



1 Proceedings U. S. Nat. Museum, vol. xxn, pp. 501-1044, 1900. Separate 

 paper No. 1205, with pp. i-viii prefixed. 



