16 University of Michigan 
QUADRULA PUSTULOSA PRASINA (Conrad), 1834 
Type locality: Fox River at Green Bay. 
Unio prasinus Conrad, ’34? (May), p. 44, pl. 3, f. 1. 
Unio schoolcraftensis Lea, ’34 (Sept.), p. 37, pl. 3, f. 9. 
Unio prasinus Conrad, 37, 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 published in 1834; 
but according to Conrad (Mon. 9, 737, p. 80), prasinus dates 
from May, schoolcraftensis from September of that year. 
Thus prasinus has the priority. 
QUADRULA QUADRULA Rafinesque, 1820 
Type locality: Ohio River. 
Obliquaria (Quadrula) quadrula Rafinesque, ’20, p. 307. 
Unio rugosus Barnes, ’23, 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, DP. 27. 
Quadrula lachrymosa (Lea), Simpson, ’14, p. 841. 
Quadrula quadrula Raf. = Q. lachrymosa asperrima (lea), Vanatta, 
’I5, p. 550 (“type” examined). 
Obliqu. quadrula Raf.=Q. lachrymosa (Lea), Walker, ’16¢, p. 46, 
and 18, p. 167 (‘if identifiable”). 
Quadrula quadrula Raf., Utterback, 716, 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. 
