170 MEMOIRS OF THE CARNEGIE MUSEUM. 



sula), by localities in Wisconsin and Minnesota, and the Canadian range given by 

 Simpson. Southward it is well distributed over the states of Ohio to the Ohio 

 River (Sterki, 1907a), Indiana (Call, 1896o and 1900), and Illinois (Baker, 1906; 

 Forbes & Richardson, 1913). It has not been found in the Ohio above Cincinnati, 

 and south of the Ohio. It does not occur in southwestern Pennsylvania and in 

 the headwaters of the Monongahela and in the Little Kanawha in West Virginia. 

 But it turns up in the Big Kanawha-drainage, and is found in the Licking system 

 in Kentucky. It is known from the Cumberland (Wilson & Clark, 1914) (also 

 Carnegie Museum), and is very rare in the uppermost Tennessee system (Powell 

 River). (This will be discussed elsewhere.) 



Westward A. ferussacianus goes across the Mississippi, where it is found in 

 South Dakota, Iowa, and Kansas, advancing here, in the Kansas River-drainage, 

 farther westward than any other shell (Decatur Co., Scammon, 1906, and Logan 

 Co., Carnegie Museum). In addition, the Carnegie Museum has received material 

 representing this species from the state of Colorado (Platte River-drainage), which 

 extends its western range here to the foot of the Rocky Mountains. 



Farther south this species has not been reported, and in general the range is 

 rather northern. 



Anodontoides ferussacianus buchanensis (Lea) (1838). 

 Anodontoides ferussacianus suhcylindraceus (Lea) Simpson, 1900, p. 660; Ano- 

 dontoides ferussacianus buchanensis (Lea) Simpson, 1914, p. 469. 



Plate XI, fig. 6. 

 Records from Pennsylvania: 



Ortmann, 19096, p. 202."2 



Characters of variety: This form differs from the typical ferussacianus by the 

 more convex valves and the more elongated outline, which renders the whole shell 

 more nearly subcylindrical. 



L. H. D. 



Size: 1. Prcsque Isle, Cat. No. 61.1.577 82 mm. 39 mm. 3.3 mm. 



2. do. Cat. No. 61.3295 81 " 38 " 28 " 



3. do. " " do 7.5 " 38 " 29 " 



4. do. " " do 66 " 31 " 26 " 



5. do. " " do 65 " 31 " 24 " 



Soft parts not different from those of the typical form. Glochidia not observed 

 by myself. Surber (1912, PI. 3, fig. 43) figures them; his measurements are: 



'^^ Pilsbry (1894, p. 30) records " Anodonta subcijlindrica Lea " (sic!) from York Furnace, York Co. 

 The specimens thus hibeled in the Philadelphia Academy are Anodonta cataracta Say. (See above.) 



