Catai.oguk Recenti^y Described MoIvI.usca 173 



Pl,EUROBEMA EASSINANS (Lca). 



This species and its variety rhomboides Simp, are Fusconaias and syn- 

 onyms of F. harncsiana bigbyensis (Lea) according to Ortmann (84, p. 59). 



PleurobEma liENTicuivARis (Lea). 



Is a Pnsconaia and a synonym of P. barnesiana (Lea) according to Ort- 

 mann (84, p. 59). 



PlEurobema LEwisn (Lea). 



That this species is distinct from P. cor (Con.), to which it was referred 

 hy vSimpson, has heen shown by Walker (160, p. 114) and U. crapulns Lea, 

 if not distinct, is made a synonym. 



PlEurobema mErEdithii (Lea). 



Is a Pnsconaia and a synonym of P. barnesiana (Lea) according to Ort- 

 mann (84, p. 59). 



Lampsilis ozarkensis (Call). 



Is a Pnsconaia and includes Pleurobema argenteurn pannosuni Siinp., 

 breve subellipticiun Simp, and utterbacki Fr. according to Ortmann (84, 

 P-63). 



PlEurobema pudicum (Lea). 



Is a Pnsconaia and a synonym of P. barnesiana (Lea) according to Ort- 

 mann (84. p. 59)- 



Pleurobema simpsoni A^anatta. 



Pleurobema simpsoni Vanatta, Pr. A. N. S. P., 191 5, p. 559. 



Originally described as Unio striatiis Lea. Lea's name is not preoccu- 

 pied by Rafinesque, but as suggested to me by Frierson it seems to have 

 been by Goldfuss for a fossil species. I have not been able to examine, or 

 to have examined, Goldfuss' original description. Lea refers to Goldfuss' 

 species in his Synopsis, but as usual gives no exact citation. A pal?eonto- 

 logical friend has supplied the following references, which seem sufficient 

 to settle the question. Goldfuss' description of his Unio striatus is to be 

 found in his '"Pertrefakten Deutschlands." II, 1839, p. 182, pi. 132, fig. 3. 

 Oronn in his "Index Paleontologicus," II, p. 1345, includes the species 

 among his "omnia dubii generis". D'Orbigny in his "Prodrome de Paleon- 

 tologie" includes it in his genus Hesione (1847). These facts were probably 

 known to Lea and explain why he did not rename his species, as in other 



