Plate 21
ATLANTIC COAST UNIVALVES
a. FLORIDA WORM-SHELL, Vermiculnria knorri Desh., 5 inches (North Carohna to Gulf of Mexico), p. 145.
b. FARGO'S WORM-SHELL, Vermicidaria fnrgoi Olsson, 3 inches (West Florida to Texas), p. 145.
e. WEST INDIAN WORM-SHELL, Vermi- cidaria spirata Phil., 4 inches (Florida Keys and West Indies), p. 144.
d. IRREGULAR WORM-SHELL, Petalocon- chns irregularis Orb., 3 inches (Florida and West Indies), p. 143.
c. BLACK WORM-SHELL, Petalconchm 7iigricaiis Dall, 3 inches West Florida), p.^143.
f. ATLANTIC MODULUS, Modulus vwdu- lus L., Yi inch (Florida to Brazil), p. 151.
g. SLIT WORM-SHELL, Tenagodus squa- rnatus Blainville, 4 inches (Florida and West Indies), p. 145.
h. EASTERN TURRET-SHELL, Turriiella exoleta L., 2 inches (Florida and West Indies), p. 141.
i. VARIEGATED TURRET-SHELL, Turri- tella variegata L., 4 inches (West In- dies), p. 141.
j. BORING TURRET-SHELL, Turritella acropora Dall, 1 inch (North Carolina to West Indies), p. 141.
k. BROWN SARGASSUM SNAIL, Litiopa melanostoma Rang, 'Vin inch (Pelagic, warm seas), p. 156.
1. ERODED TURRET-SHELL, Tachyrhyn- chus erosurn Couthouy, 1 inch (Nova Scotia to Massachusetts, p. 140.
m. COMMON ATLANTIC SLIPPER-SHELL, Crepidula fornicata L., 2 inches (Ca- nada to Texas), p. 170.
n. CONVEX SLIPPER-SHELL, Crepidula convexa Say, ji inch (Massachusetts to West Indies), p. 171.
o. CIRCULAR CUP-AND-SAUCER, Calyp- traea centralis Conrad, ^ inch (North Carolina to Texas, south), p. 169.
p. FALSE CUP-AND-SAUCER, Cheilea ecfuestris L., % inch (Florida Keys and West Indies), p. 165.
q. SPINY SLIPPER-SHELL, Crepidula acu- leata Gmelin, % inch (North Carolina to Texas, south), p. 171.
STRIATE CUP-AND-SAUCER, Crucibu- lum striatum Say, 1 inch (Nova Scotia to South Carolina), p. 170.
WEST INDIAN CUP-AND-SAUCER, Cru- cibulum auricula Gmelin, 1 inch (West Florida, south), p. 169.
WHITE HOOF-SHELL, Hipponix anli- (juatus L., 3"2 inch (Florida, south; Cali- fornia, south), p. 166.
GRACEFUL MELANELLA, Melanella gracilis C. B. Ads., 34 i'^ch (North Ca- rolina to Gulf of Mexico), not in text.
FAT MELANELLA, Melanella gibba D2 Folin, 34 inch (North Carolina to Gulf of Mexico), not in text.
TWO-LINED MELANELLA, Melanella bilineata Alder, 3^ inch (North Carolina to West Indies), not in text.
ORBIGNY'S SUN-DIAL, Torinia bisulcata Orb., i/;{ inch (North Carolina to Gulf of Mexico), p. 142.
KREBS' SUN-DIAL, Architectonica krebsi Morch, Yj inch (North Carolina to West Indies), p. 143.
MALTBIE'S TRIVIA, Trivia maltbiana Schw. and McG., 3? inch (North (>aro- lina to Florida, south), p. 178.
SUFFUSE TRIVIA, Trivia suffusa Gary, ^/a inch (Southeastern Florida and West Indies), p. 177.
COFFEE BEAN TRIVIA, Trivia pediculus L., Yj inch (Florida to Brazil), p. 177.
LITTLE WHITE TRIVIA. Trivia candi- dula Gaskoin, 34 inch (North Carolina to West Indies), p. 178.
