Catalogue; Rece;nti,y De;scrieed Moi<IvUsca 179 



Ptyciioeranchus phaskolus (Hild.). 



Unio coinprcssissiiiuis pcrforinosus De Gregorio, AIoll. di aq. dul. di Amer., 



1914, p. 23, pi. \^ fig. 2. 

 Unio lanceolatiis blandiis De Gregorio, Ibid, p. 22, pi. YIII, fig. 2. 

 Unio impcritus 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 siibteritiis pin'cl'.coniatus De Gregorio, AIoll. di aq. dul. di Amer., 1914, 

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



Genus CYPROGENIA Agassiz, 1852. 



Cvprogenia irrorata (Lea). 



Is Obovaria stcgaria 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 stcgaria has priority. 



Genus PLAGIOLA (Rafinesque, 1819) Agassiz. 



PlvAGIOLA DONACIBORMIS (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). 



Pi,AGiOi,A ELEGANS (Lea). 



Unio elegans elegantopsis De Gregorio, LIoll. 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 Trnncilla trnncata as this species. 

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

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

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

 plata is subsequent to both. 



Pi^AGiOLA sECURis (Lea). 



Both Obliqnaria 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. cllipsaria 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. 



