140 Bryant Walker 



PyRGULOPSIS SCAEARIFORMIS (Wolf). 



Pyrgula scalariformis IVVolf, Am. J. of Con., V, 1869, p. 198, pi. 17, fig. 3. 

 Pyrgulopsis scalariformis Shimek, Bull. Lab. Nat. Hist. St. Univ. la., II, 



1892, p. 168, pi. xiii, figs. 3a-d. 

 Pyrgula scalariformis mississippiensis Pilsbry, Am. Nat., 1886, p. 5. No 



description. 

 Pyrgulopsis mississippiensis Call and Pilsbry, Pr. Davenport A. N. S., V, 



1886, p. 13, pi. II, figs. 14-16; Walker, Naut., XIX, 1906, p. it6, pi. 



5> fig- 15- 

 Type locality: Illinois River, Tazwell Co., Ills. Holocene. 



According to Shimek (1. c.) mississippiensis is a synonym of scalari- 

 formis. 



Pyrgulopsis ozarkunsis Hinkley, 



Pyrgulopsis omrkensis Hinkley, Pr. U. S. Nat. Mus., 49, 1915, p. 588, pi. 



78, fig. 2. 

 Type locality : North Fork of White River, above Norfolk, Ark. 



Pyrgulopsis sheldoni (Pilsbry). 



Amnicola sheldoni Pilsbry, Naut., IV, 1890, p. 52. 

 Type locality: Lake Michigan, Racine, Wis. 



This species seems to be a Pyrgulopsis rather than an Amnicola. 



Pyrgulopsis wabashEnsis Plinkley. 



Pyrgulopsis zvahashensis Hinkley, Naut., XXI, 1908, p. 117. 

 Type locality: Wabash River, The Chains, Posey Co., Ind. 



Genus POTAMOPYRGUS Stimpson, 1865. 



Potamopyrgus coronatus (Pfeiffer). 



Paludina coronata Pfeifit'er, Wiegm. Archiv., I, 1840, p. 253. 

 Type locality : Cuba. 



Listed from Miami River, Fla., by Rhoads (113, p. 47). 



Potamopyrgus spinosus (Call and Pilsbry). 



Pyrgulopsis spinosa Call and Pilsbry, Pr. Davenport A. N. S., V., 1886, p. 



14, pi. II, fig. 17-19. 

 Hydrobia texana Pilsbry, Ibid, V, 1886, p. 33, pi. Ill, fig. 1-6. 

 Type locality: spinosus, Comal Creek, Texas; texana, Guadelupe River 

 and Comal Creek, Tex. 

 According to Pilsbry (91, p. 327) this species is a Potamopyrgus and 

 is doubtfullv distinct from coronatus. Texana is the ecarinate form. 



