71 
Unio plicatus, 
Say, 
peruvianus, 
Lam. 
Poulsoni, 
Conrad, 
*pileus, 
Lea, 
perovalis, 
Conrad, 
f purpurascens, 
Lam. 
j coarctata, 
Lam. 
purpureus, 
Say, 
carinifera, 
Lam. 
j complanatus, 
Lea, 
^aurata, 
Raf. 
pec.torosus, 
Conrad , 
planus, 
Barnes , 
person atus, 
Say, 
subrotund tis, 
Lea, 
prasinus, 
Conrad, 
C rugosus, 
< lacrymosus, 
Barnes , 
quadrulus, 
Raf 
Lea, 
£ asperrimus, 
Lea, 
rectus, 
Lam. 
( U. latissima, 
^ U. praelongus, 
Raf. 
Barnes , 
rubellus, 
Conrad, 
Raveneli, 
Conrad, 
treflexus, 
Raf. 
cornu tus, 
Barnes, 
radiatus, 
Lam. 
{ My a radiata, 
( virginiana, 
Gmel. 
Lam , 
ridibundus, 
Say, 
retusus, 
Raf. 
stapes, 
Lea, 
stramineus, 
Conrad, 
subtentus, 
Say, 
stegarius, 
Raf. 
irroratus, 
Lea, 
f pusilla, 
Raf. 
subrotundus, 
Raf. 
j striata, 
] circulus, 
Raf. 
Lea, 
^orbiculatus, 
Hildreth, 
scalenius, 
Raf. 
cuneata, 
( patulus, 
Raf. 
Lea , 
* This species nearly approaches the sulcatus , of Lea, if it be 
not a variety of that shell* Lea observes* “it differs from” the 
latter “in being more elongated and in being destitute of a pur- 
ple nacre.” A specimen 1 found in Elk river, Alabama, has a 
deep purple nacre. 
