UNIO 691 
Type locality, Savannah River at Augusta, Ga. Also, Poto- 
mac River, Va.; Emmitsburg, North Carolina, etc. 
Unio productus Conrap, Monog., III, 1836, p. 31, pl. x1v, fig. 
1.—HAn ey, Biv. Shells, 1843, p. 205, pl. xxi, fig. 17.— 
KuSsTER, Conch. Cab. Unio, 1852, p. 66, pl. xvi, fig. 2.— 
SIMPSON, Syn., 1900, p. 735. 
Margarita (Unio) productus Lea, Syn., 1836, p. 37; 1838, p. 
24. 
Margaron (Unio) productus Lea, Syn., 1852, p. 37; 1870, p. 
60. 
Elliptio productus ORTMANN, Ann Car. Mus., VIII, 1912, 
270. 
Unio barrotti Kuster, Conch. Cab. Unio, 1861, p. 189, pl. LIx, 
fig. 6. 
None of the specimens I have seen exactly agree with Con- 
rad’s figure and description in the Monography, being a little 
less solid and inflated, with dorsal and ventral lines not quite 
so nearly parallel. Dr. Lea has specimens from Emmitsburg, 
North Carolina, which he labels U. productus, that agree well 
with our more northern specimens. 
Unio NASuTULUS Lea. 
Shell elongated, subrhomboid, subelliptical or slightly obo- 
vate, rather conipressed, scarcely subsolid, inequilateral ; beaks 
apparently low and not inflated; posterior ridge subangular, 
ending behind in a drawn-out point just below the median line ; 
surface closely, concentrically striate; epidermis greenish- 
brown, faintly rayed, dull or subshining; base line curved, full 
behind the middle; pseudocardinals stumpy; two in the left 
valve and one in the right; laterals delicate, straight ; muscle 
scars small, the posterior ones faint; nacre dirty pale brownish 
or purplish, iridescent behind. 
Length 45, height to, diam. 10 mm. 
Type locality, Livingston’s Creek, Brunswick County, ‘North 
Carolina. 
Unio nasutilus Lea, Pr. Ac. N. Sci. Phila., VII, 1863, p. 192 
