176 Bryant Walker 



Subfamily ANODONTIN^ Ortmann, 1912. 



Genus vSTROPHlTUS Ralinesque, 1820. 



STRoniiTus KDKNTULUS (Say). 



Anodoiita foliopsis De Gregorio Moll, di aq. dul. di Amer., 1914, p. 33, pi. 

 XI, figs. 4a-b. 

 There seems to be some uncertainty as to the proper name to be used 

 for this species. Say described his edentulns in 1829. Swainson had al- 

 ready in 1822 described his Anodon rugosus from the "'United States." Lea 

 (Obs., I, p. 39) says that "it is well known"' that Swainson's rugosus is the 

 adult of Say's undnlata, which has priority. Simpson, who considers un- 

 dulatus and cdrutulus distinct, for some unexplained reason includes Swain- 

 son's species under edentulns as a synonym. Dall (32, p. 127) "on the face 

 of the returns" gives the species to Swainson. I have not been able to ex- 

 amine Swainson's description and figure myself. Ortmann (78, j). 118) 

 unites both species under the prior name of undulatus. If this is correct, 

 the exact identity of Swainson's species becomes immaterial. Otherwise 

 his description and figure should be critically examined again to determine,. 

 if possible, to which species it belongs. 



Strophitus edentui.us sTi.TiFFERiANus (Lea). 



This seems to be a well marked race characteristic of the Tennessee- 

 drainage and as such entitled to varietal rank. 



Genus ANODONTA Lamarck, 1799. 



Anodonta cataracta Say. 



Anodoiita ? suhcylindracea propexilis De Gregorio, AIoll. di aq. tlul. di 

 Amer., 1914, p. 33, pi. XII, figs. la-e. 



Anodonta grandis Say. 



Anodonta venusta De Gregorio, Moll, di aq. dul. di Amer. 1914, p 35 pi. 

 XII, fig. 2. 

 This species founded on a single deformed valve is made the tvpe of a 

 new subgenus, Nayadina. 



Anodonta imiuvCilts Say. 



Anodonta plialena De Gregorio, Moll, di aq. dul. di Amer., 1914. p. ^4, ])1. 

 XI, figs. 3a-e. 



This species is Lastena ohioensis Raf. and a Lastena according to Utter- 

 back (135, p. 260). 



Anodonta surorbiculata Say. 



According to Utterback (135. p. 256) this species is a Lastena. 



