1 66 Bryant Wai,ker 



Dr. Pilsbry in Vanatta's paper has very aptly stated the situation as fol- 

 lows : "The use of a Rafinesquian name depends upon whether it could be 

 identified by descriptions published prior to any other recognizable name 

 for the same species. That it can be recognized from the types or other 

 specimens from Rafinesque does not entitle his names to acceptance unless 

 the published descriptions are adequate. This question of the adequacy of 

 published diagnoses must be considered for each species separately." 



In the same connection, see Walker, (157, p. 74)- 



Subfamily UNIONIN^ (Swainson, 1840), Ortmann, 1910. 



Genus QUADRULA Rafinesque, 1820. 



OuADRULA askEwi (Marsh). 



Frierson (41, p. 136) refers this to beadleiana Lea. But Ortmann (81, 

 p. 21) states that it does not group with that species, but is a Fv.sconaia of 

 the undata group. 



Qu ADRULA BEADLEIANA (Lea). 



Includes 0. chickasawhcnsis (Lea) and askcivl (Marsh) according to 

 Frierson (41, p. 136). But Ortmann (79, p. 268) says that it is an BUiptio. 



OUADRULA BURSAPASTORIS (B. H. Wright). 



Is a Ft'sconaia according to Ortmann (81, p. 90). 



Qi.iADRUEA cocciNEA (Conrad). 



Is a Plenrohema according to Ortmann {yy, p. loi) and a variety of O. 

 obliqua (Lam.) (78, p. 117 and 79, p. 263). 



Utterback (135, p. 190) quotes catillus Con., which Simpson has con- 

 sidered a synonym of 0. coccinea, as a variety of Q. obliqua (Lam.) and on 

 p. 193 of the same paper considers it identical with Q. solida (Lea), having 

 priority and gives it specific rank as such. 



OUADRUEA COOPERIANA (Lca). 



At first referred to Plcurobcma by Ortmann {yd,, p. 117), this species is 

 now included in Flcthohasus by him (79, d. 2^1). 



OuADRUEA CYLINDRICA (Say). 



Urno cyl'mdricus propetypicus De Gregorio, INIoll. di aq. dul. di Amer., 1914, 



p. II, pi. 4, fig. I. 

 Unio cyl'mdricus acrispatus De Gregorio, Ibid, p. 11, pi. 4, fig. 2. 



Vanatta (140, p. 556) states that the Unio solcnoidcs Raf. of the Poul- 

 son collection is this species. 



