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184 Avier'ican Seashells
Cyphoma mcgintyi Pilsbry McGinty's Cyphoma
Lower Florida Keys and the Bahamas.
Plates 8; 4s
Similar to gibbosa, but more elongate, whitish with tints of lilac or pink
on the back. The side callus on the right is thick and narrow. Aperture
cameo-pink. Mantle with numerous solid spots which are roughly round or
in the shape of short bars. Not uncommon.
Cyphovta signatum Pilsbry and McGinty
Lower Florida Keys.
Fingerprint Cyphoma
Plate 4t
Similar to mcgintyi, but with the transverse ridge on the back much
weaker, and the anterior end of the aperture more dilated than in the two
preceding species. Color light-buff with a cream-buff tint deep inside the
aperture. Mantle pale-yellow with numerous, crowded, long, black transverse
lines. The rarest of the Florida Cyphomas.
Superfamily HETEROPODA
Family ATLANTIDAE
Genus Atlanta Lesueur 181
Atlanta peroni Lesueur Peron's Atlanta
Atlantic and Pacific warm waters; pelagic.
7
Figure 41
^ inch in diameter, planorboid, compressed from above, fragile, transparent
and glassy. Later whorls openly coiled but connected by a sharp
peripheral keel. Outer lip notched in the region of the shell. Often washed
ashore after storms, and frequently brought up in dredge hauls. Five other
species have been reported from American waters.
Figure 41. Shell of the hcteropod, Atlanta peroni Lesueur, y, inch.
Genus Oxy gyrus Benson 1835
Oxy gyrus keraudreni Lesueur Keraudren's Atlanta
Atlantic warm waters; pelagic.