1 6 University of Michigan 



QuADRULA pusTULOSA PRASiNA (Conrad), 1834 



Type locality: Fox River at Green Bay. 



Unio prasinus Conrad, '34" (May), p. 44, pi. 3, f. I. 

 Unio schoohraitensis Lea, '34 (Sept.), p. 2>7, pl- 3, f. 9- 

 C/mso prasinus Conrad, '27, p. 79, pl. 44, f. 2. 

 Quadrula pustulosa schoolcraftensis, Simpson, '14, p. 850.. 



Simpson ('14, p. 849) makes U. prasinus Con. a synonym 

 of Quadrula pustulosa (Lea), while he admits U. schoolcraft- 

 ensis Lea as a variety of pustulosa. 



The fact is that prasinus and schoolcraftensis were founded 

 upon the same specimen. Both names were pubHshed in 1834; 

 but according to Conrad (Mon. 9, '37, p. 80), prasinus dates 

 from May, schoolcraftensis from September of that year. 

 Thus prasinus has the priority. 



QuADRUivA QUADRULA Rafinesquc, 1820 



Type locality: Ohio River. 



Obliquaria (Quadrula) quadrula Rafinesque, '20, p. 307. 



Unio rugosus Barnes, '22,, p. 127, pl. 8, f. 9. 



Unio lachrymosus Lea, '28, p. 272, pl. 6, f. 8. 



Unio asperrimus Lea, '31, p. 71, pl. 5, f. 3- 



U. quadrulus Raf. = U. rugosus Bar. = U. asperrimus Lea, Ferussac, 



'35, p. 27. 



Quadrula lachrymosa (Lea), Simpson, '14, p. 841. 



Quadrula quadrula Raf. -= Q. lachrymosa asperrima (Lea), Vanatta, 

 '15, P- 556 ("type" examined). 



Obliqu. quadrula Raf. = Q. lachrymosa (Lea), Walker, 'i6c, p. 46, 

 and iSf", p. 167 ("if identifiable"). 



Quadrula quadrula Raf., Utterback, '16, p. 53. 



The original description of Rafinesque is sufficient to recog- 

 nize this species. The oblique rib and depression of the disk, 

 forming a sinus behind, are described, also the general char- 

 acter and position of the tubercles. Thus the specific name 

 quadrula stands. The species is the type of the genus Quad- 

 rula by absolute tautonymy. 



