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a. COMMON EASTERN OYSTER, Crasso-
strea virgiiiica Gmelin, 3 inches (entire
Atlantic Coast), p. 375.
b. SPONGE OYSTER, Osirea permoUis Sby.,
2 inches (North Carolina to West In-
dies), p. 374.
c. CRESIED OYSTER, Ostren eqiiestris Say,
2 inches (North Carolina to West In-
dies), p. 373.
d. COON OYSTER, Ostrea Irons L., 2 inches.
Two forms. (Florida and West Indies),
p. 373.
e. DISCORD MUSCULUS, Mnscidus discors
L., 1 inch (North Atlantic and North
Pacific), p. 355.
f. SMOOTH MUSCULUS, Mnscnlus laevigatus
Gray, 1 inch (North Atlantic and
North Pacific), p. 355.
g. BLACK MUSCULUS, Mnscnlus niger
Gray, 2 inches (Arctic to North Caro-
lina; also to Washington), p. 355.
h. ATLANTIC RIBBED MUSSEL, Modiohis
demissus Dillwyn, 3 inches (Canada to
South Carolina), p. 351.
i. ATLANTIC PAPER MUSSEL, Amygdnlnm
papyria Conrad, 1 inch (Maryland to
Texas), p. 353.
j. GLANDULAR CRENELLA, Creuella
glandida Totten, ^/s inch (Labrador to
North Carolina), p. 350.
k. GIANT DATE MUSSEL, Lithophaga antiUanim
Orb., 4 inches (Gulf of Mexico,
south), p. 357.
1. FLATTENED CARDITA, Venericardia
perphnia Conrad, 34 i"ch (North Caro-
lina to Florida), p. 380.
Plate 28
ATLANTIC: COAST BIVALVES
m. BLACK DATE MUSSEL, Lithophaga nigra
Orb., 2 inches (Florida and West In-
dies), p. 355.
n. MAHOGANY DATE MUSSEL, Lithophaga
bisnlcata Orb., 1 inch (Florida
to Argentina), p. 357.
o. LENTIL ASTARTE, Astarte snhequilatera
Sby.. 1 inch (Arctic Seas to off Georgia).
p. 376.
p. CORAL-BORING CLAM, Coralliophaga
coralliophaga Gmelin, V/j inches (Gulf
and West Indies), p. 382.
q. BOREAL ASTARTE, Astarte borealis
Schumacher, 1 V2 inches (Arctic to
Massachusetts; to Alaska), p. 375.
r. WAVED ASTARTE, Astarte undata
Gould, 1 inch (Gulf of Maine), p. 376.
s. SMOOTH ASTARTE, Astarte castanea
Say, 1 inch (Nova Scotia to Cape Cod,
Massachusetts), p. 376.
t. NORTHERN CARDITA, Venericardia
borealis Conrad, 1 inch (Labrador to
North Carolina), p. 379.
u. GLASSY LYONSIA, Lyonsia hyalina Conrad,
lA inch (Nova Scotia to South Ca-
rolina), p. 468.
V. LEA'S SPOON-CLAM, Feriploma leanum
Conrad, 1 inch (Nova Scotia to North
Carolina), p. 474.
\v. PAPER SPOON C:LAM, Periploma papyratium
Say, 1 inch (Labrador to Rhode
Island), p. 472.
X. UNEQUAL SPOON CLAM, Periploma
inequale C. B. Adams, 1 inch (South
Carolina to Texas), p. 473.
y. CONRAD'S THRACIA, Thracia conradi
Couthouy, 3 inches (Nova Scotia to
New York), p. 471.