184 



Avier'ican Seashells 



Cyphoma mcgintyi Pilsbry McGinty's Cyphoma 



Plates 8; 4s 



Lower Florida Keys and the Bahamas. 



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. 



Fingerprint Cyphoma 



Plate 4t 



Cyphovta signatum Pilsbry and McGinty 



Lower Florida Keys. 



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 trans- 

 verse lines. The rarest of the Florida Cyphomas. 



Superfamily HETEROPODA 



Family ATLANTIDAE 

 Genus Atlanta Lesueur 181 7 



Atlanta peroni Lesueur Peron's Atlanta 



Figure 41 



Atlantic and Pacific warm waters; pelagic. 



^ inch in diameter, planorboid, compressed from above, fragile, trans- 

 parent 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. 



