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a. ANGULATE PERIWINKLE, Littonna
angulifern Lam., 1 inch (Florida and
West Indies), p. 133.
b. COMMON PERIWINKLE, Littonna littorea
L., 1 inch (Labrador to New
Jersey; Europe), p. 132.
c. MARSH PERIWINKLE, Littonna irrorata
Say, 1 inch (New York to Texas), p. 132.
d. NORTHERN ROUGH PERIWINKLE,
Littoriua saxntilis Olivi, '2 inch (Arctic
New Jersey), p. 133.
e. ZEBRA PERIWINKLE, Littorina ziczac
Gmelin, 1 inch (Florida to Texas and
south), p. 132.
L NORTHERN YELLOW PERIWINKLE,
Littorina obtnsata Linne. '2 inch
(Arctic to New Jersey), p. 133.
g. BEADED PERIWINKLE, Tectarius miiricatus
Linne, 1 inch (Florida Keys,
south), p. 134.
h. FALSE PRICKLY-WINKLE, Ecliininus
nodulosus Pfr., % inch (Florida Keys,
south), p. 135.
i. COMMON PRICKLY-WINKLE, Nodilit-
Plate 19
ATLANTIC COAST UNIVALVES
torina tuberculata Mke., j^ inch (Flo-
rida Keys, south), p. 134.
j. SPOTTED PERIWINKLE, Littorina
rneleagris Pot. and Mich., V.s incli
(Florida Keys, south).
k. DWARF BROWN PERIWINKLE, Litto-
rina mespilhini Miihlfeld, y^ inch (Flo-
rida Keys, south), p. 133.
1. STOCKY CERITH, CeritJiium literatum
Born, I inch (Southeastern Florida and
West Indies), p. 154.
m. FLY-SPECKED CERITH, Cerithium muscaruni
Say, 1 inch (Florida and West
Indies), p. 154.
n. FLORIDA CERITH, Cerithium floridanum
Morch, \]/^ inches (North Carolina
to Florida), p. 153.
o. DWARF CERITH, Cerithium variabile
C. B. Adams, Yi inch (Florida to Texas,
south), p. 154.
p. MIDDLE-SPINED CERITH, Cerithium
algicola, C. B. Adams, 1 inch (Florida
and West Indies), p. 154.
q. IVORY CERITH, Cerithium eburneum
Brug., 1 inch (Southeastern Florida and
West Indies), p. 154.
r. VARIABLE BITTIUM, Bittium variiim
Pfr., y^ inch (Maryland to Texas and
Mexico), p. 155.
s. FALSE CERITH, Batillaria minima Gme-
lin, 3^ inch (Florida and West Indies),
p. 153.
t. PLICATE HORN SHELL, Cerithidea
pliculosa Menke, 1 inch (Florida to
Texas, south-, p. 152.
u. COSTATE HORN SHELL, Cerithidea
costata Da Costa, Ij inch (West Florida,
south , p. 152.
V. GREEN'S MINIATURE CERITH, Ceri-
thiopsis greeni C. B. Adams, ]4, inch
(Massachusetts to West Indies, p. 157.
w. AWL MINIATURE CERITH, Cerithiopsis
subulata Montagu, Y inch (Massachusetts
to West Indies , p. 157.
X. LADDER HORN SHELL, Cerithidea
scalarijormis Say, 1 inch (South C; ro-
lina to Florida, Cuba), p. 152.
y. BLACK-LINED TRIFORA, Triphora
nigrocincta C. B. Adams, Y inch (Massachusetts,
south), p. 159.
z. BEAUTIFUL TRIFORA, Triphora pul-
chella C. B. Adams, 34 inch (Florida,
south), p. 159.
zz. MOTTLED TRIFORA, Triphora decorata
C. B. Adams, Yi inch (Florida and West
Indies), p. 159.