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a. ERODED PERIWINKLE, Littorina planaxis
Phil., ^ inch (Washington to
Lower California), p. 134.
b. SITKA PERIWINKLE, Littorina sitkana
Phil., % inch (Alaska to Washington),
p. 134.
c. CHECKERED PERIWINKLE, Littorina
scutulata Old., Yj inch (Alaska to
Mexico), p. 134.
d. FLAT WORM-SHELL, Spiroglyphus
lituellus Morch (Alaska to California),
p. 144.
e. SCALED WORM-SHELL, Aletes squami-
geriis Cpr. (Alaska to Peru), p. 144.
f. ONYX SLIPPER-SHELL, Crepidula ojiyx
Shy., 2 inches. Left shell lived on
scallop (California to Chili), p. 171.
g. COOPER'S TURRET-SHELL, Turritella
cooperi Cpr., 2 inches (California to
Mexico), p. 141.
h. MARIA'S TURRET-SHELL, Turritella
mariana Dall, 2^ inches (California to
Panama), p. 142.
i. RECLUZ'S MOON-SHELL, Polinices reclii-
j.
sianus Desh., 2 inches (California to
Lower California), p. 187.
WROBLEWSKI'S WENTLETRAP, Opalia
wrobleivshii Morch, 1 inch (Alaska to
San Diego, California), p. 162.
k. PACIFIC HALF-SLIPPER SHELL, Crepi-
patella lingulata Gld., % inch (Alaska
to Panama), p. 170.
Plate 20
PACIFIC COAST UNIVALVES
1. PACIFIC CHINESE HAT, Calyptraea
fastigata Gld., 1 inch (Alaska to Cali-
fornia), p. 169.
m. GOULD'S DOVE-SHELL, Nitidella goiildi
Cpr., Yi inch (Alaska to California),
p. 222.
n. PACIFIC MUD NASSA, Nassarius tegula
Reeve, % inch (California to Lower
California), p. 238.
o. APPLE SEED, Erato vitellina Hinds, Yi
inch (California to Lower California),
p. 176.
p. IDA'S MITER, Mitra idae Melville, 2
q.
inches (California), p. 249.
BEATIC DWARF OLIVE, OUveUa beatica
Cpr., Y inch (Alaska to California),
p. 247.
r. CALIFORNIAN FROG-SHELL, Bursa
californica Hinds, 4 inches, with cluster
of eggs laid on clam shell (California
to Lower California), p. 199.
s. GIANT WESTERN NASSA, Nassarius
fossatus Gould, 2 inches (Vancouver,
B. C, to Lower California), p. 240.
t. Top view of living animal of Oliva, p. 245.
u. SOLANDER'S TRIVIA, Trixna solandri
Sby., % inch (Catalina Island, Cali-
fornia to Panama), p. 179.
v. CALIFORNIAN TRIVIA, Trivia californiana
Gray, '2 inch (California to
Mexico), p. 179.
w. X-ray photo of SPINDLE SHELL, Fusinus,
p. 243.