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a. KEYHOLE LIMPET, Megathura crenu-
lata Sby., 4 inches (Monterey, Califor-
nia, south), p. 99.
b. ROUGH KEYHOLE LIMPET, Diodora
aspera Esch., 2 inches (Alaska to Lower
California), p. 97.
c. VOLCANO SHELL, Fissurella volcano
Reeve, 1 inch (Crescent City, California,
south), p. 100.
d. TWO-SPOTTED KEYHOLE LIMPET,
Megatebennus hiniacidatus Dall, '^2
inch (entire coast), p. 99.
e. HARD-EDGED KEYHOLE LIMPET,
Liicapiriella callomargijiata Dall, 1 inch
(California, south), p. 99.
f. FINGERED LIMPET, Acmaea digitalis
Esch., 1 inch (Alaska to Mexico), p. 103.
g. TEST'S LIMPET, Acmaea conus Test, %
inch (California to Lower California),
p. 102.
h. WESTERN BANDED TEGULA, Tegula
ligidata Menkc, % inch (Monterey,
California, south), p. 120.
i. CARPENTER'S DWARF TURBAN, Homalopoma
carpenteri Pils., ^/;j inch
(entire coast), p. 126.
j. GIANT OWL SHELL, Lottia gigantea
Gray, 3 inches (Crescent City, Califor-
nia, south), p. 101.
k. GILDED TEGULA, Tegula anreotincta
Forbes, 1 inch (Southern California,
south), p. 120.
1. ROUGH LIMPET, Acmaea scabra Gould,
1 inch (Washington to Lower Califor-
nia), p. 103.
m. NORRIS SHELL, Norrisia norrisi Sby., V/j
inches (Monterey, California, south),
p. 117.
Plate 18
PACIFIC COAST UNIVALVES
n. SHIELD LIMPET, Acmaea pelta Esch.,
13^2 inches (Alaska to Lower Califor-
nia), p. 102.
o. FILE LIMPET, Acmaea limatula Cpr., 1 V^
inches (Northern California, south),
p. 102.
p. WAVY TURBAN, Astraea nndosa Wood,
3 inches (Ventura, California, south),
p. 124.
q. MASK LIMPET, Acmaea persona Esch.,
Ij,^ inches (Alaska to Monterey, Cali-
fornia), p. 103.
r. WHITE CAP LIMPET, Acmaea mitra
Esch., 1 inch (Alaska to off Lower Cali-
fornia), p. 101.
s. GRANULOSE TOP-SHELL, Calliostoma
snpragranosum Cpr., 3^2 inch (Monterey
California, south), p. 115.
t. FENESTRATE LIMPET, Acmaea fenes-
trata Reeve, 1 inch (California, south),
p. 102.
u. CALIFORNIAN LIOTIA, Liotia fenes-
trata Cpr., % inch (Monterey, Califor-
nia, south), p. 122.
V. SPECKLED TEGULA, Tegula gallina
Forbes, 1 inch (San Francisco, Califor-
nia, south), p. 119.
w. CRIBRARIA LIMPET, Acmaea fenestrata
cribraria Gould, 1 inch (Alaska to Ca-
lifornia), p. 102.
X. MONTEREY TEGULA, Tegula moulereyi
y.
Kiener, Ij^ inches (California), p. 121.
DUSKY TEGULA, Tegula pulligo Gmelin,
1 inch (Alaska to California), p. 120.
z. SEAWEED LIMPET. Ac7naea insessa
Hinds, ^4 inch (Alaska to Lower Cali-
fornia), p. 105.
z.z. UNSTABLE LIMPET, Acmaea insiabilis
Gould, 1 inch (Alaska to San Diego,
California), p. 105.