136 Bryant Walker 



Amxicola walkeri Pilsbry. 



Amnicola ivalkeri Pilsbn% Xaut., XII, 1898, p. 43; Walker, Xaut., XIX, 

 1906, p. 117, pi. \, lig. 12. 



Type locality: High Island Harbor, Beaver Ids., Lake Michigan. 



Range: Upper St. Lawrence drainage from Ottawa, Ont., to Lake -Mich- 

 igan. 



^Amnicoi,a WTXKi.i'Vi Pilsbry. 



Amnicola whiklcyi Pilsbry, Xaut., XXVI, 1912, p. i, pi. I, figs. 9-10. 

 Type locality : Saco, Ale. 



Section CIXCIXXATIA Pilsbry, 1891. 

 Amnicola cincinnatiensis (Anth.). 



Amnicola scarboroiighi 'JVyon AISS. is a synonym according to Tryon (132, 



P- 54)- 



Baker's remark (4, p. 336), that Binney's fig. 162 is an error is incor- 

 rect. That figure does not represent this species, but is the radula of A. 

 sayana Anth. (Poniatiopsis cincinnatiensis Lea). The same author (loc. 

 cit., pp. 335 and 343) has reversed the synonymy of the two species, which 

 explains his remark that Haldeman's figures of the two species are inter- 

 changed. 



The figure given for this species by Dall (32, p. 118, fig. ^y^ is also 

 incorrect, being Binney's fig. 166 of A. Ihnosa. 



Amnicola emarginata (Kuster). 



Palndlna obtnsa Lea, Pr. Am. Phil. Soc, 11, p- 34, (1841), non P. obtuse 



Phil. (1837). 

 Paiildin.a emarginata Kuster, Con. Cab., Paludina, 1852. p. 50, pi. 10. figs. 



3-4- 

 Clnclnnatla blnneyana Hann., Pr. ]\Ial. Soc. Lond., X, 1912, p. 190. 



There seems to be no valid ground for the new name proposed by Han- 

 nibal. 



Amnicola peracuta Pilsbr}^ and Walker. 



Amnicola peracuta Pilsbr>^ and Walker, Pr. A. X. S. P., 1889, p. 88, pi. Til, 



fig. 20. 

 Type locality: Spivey's Lake, X'^avarro Co., Texas. 



Genus PALUDESTRIXA d'Orbigny. 1841. 



Bythlnella Moq.-Tand, 1851. 



Stlmpsonla Clessin, J\lal. Blatt., XX\\ 1878, p. 151. 



Except as noted, all the species referred to Bythlnella by Binney belong 

 to this o^enus. 



