Catalogui; Recenti^y Described Moeeusca 179 



Ptychoeranchus phaseoeus (Hild.). 



Unio compressissimus performosus De Gregorio, JMoll. di aq. dul. di Amer., 



1914, p. 23, pi. V, fig. 2. 

 Unio lanceolatus blandns De Gregorio, Ibid, p. 22, pi. VIII, fig. 2. 

 Unio imperitus De Gregorio, Ibid, p. 15, pi. IX, fig. i. 



Say, Conrad and Frierson (1914, p. 7) have identified the Ohliquaria 

 fasciolaris Raf. as this species and Vanatta (140, p. 554) states that the 

 shell so labelled in the Poulson collection is also that species. If identifiable, 

 from the original description, Rafinesque's name would have priority. 



Ptychoeranchus subtentus (Say). 



Unio subteritus purcheornatus De Gregorio, Moll, di aq. dul. di Amer., igi4, 

 p. 31, pi. IX, fig. 2. 



Genus CYPROGENIA Agassiz, 1852. 



Cyprogenia irrorata (Lea). 



Is Obovaria stegaria Raf. according to Conrad and Vanatta (140, p. 554) 

 states that the shell so labelled in the Poulson collection is this species. If 

 identifiable from the original description stegaria has priority. 



Genus PLAGIOLA (Rafinesque, 1819) Agassiz. 



PivAGIOEA DONACIfORMIS (Lea). 



Unio zig-zag illius De Gregorio, Moll, di aq. dul. di Amer., 1914, p. 11, pi. 

 IV, fig. 3- 

 Is an Amygdalonaias according to Ortmann (81, p. 67). 



Pl,AG10I,A EEEGAN S ( Lca ) , 



Unio elegans elegantopsis De Gregorio, Moll, di aq. dul. di Amer., 1914, 



p. II, pi. IV, fig. 6. 

 Unio elegans magnelegans De Gregorio, Ibid, p. 11, pi. V, figs. la-c. 



This species is an Amygdalonaias according to Ortmann, (79, p. 328). 



Say and Conrad have identified the Truncilla truncata as this species. 

 Vanatta states (140, p. 553) that both the T. truncata Raf. and Unio meta- 

 plata Raf. as represented in the Poulson collection are this species. If iden- 

 tifiable from the original description, truncata would have precedence. Meta- 

 plata is subsequent to both. 



Pi^AGiOEA sEcuRis (Lea). 



Both Obliquaria depressa Raf. and 0. lineolata Raf. are identified by 

 vSay and Conrad as this species and both authors give the preference to 

 lineolata as the specific name. According to Vanatta (140, p. 553) these 

 two species and also 0. ellipsaria Raf. as represented in the Poulson col- 

 lection are securis Lea. If identifiable from the original description, any 

 one of Rafinesque's names would have priority. 



