ACMAEIDAE 101 



rounded, radial ribs of varying sizes. Base of shell slightly crenulate and with 

 color blotches. Exterior grayish white to dark-slate with numerous radial 

 rays of mauve-pink. Interior glossy-white, often with a fine pink line around 

 the callus at the apex. Foot of animal yellow; mantle with red stripes. Very 

 common on rocky rubble at low tide. The variety crucifera Dall is merely a 

 color form with white radial bands. 



Subgenus Clypidella Swainson 1840 

 Fissurella fascicularis Lamarck Wobbly Keyhole Limpet 



Plate lyg 



Southeast Florida and the West Indies. 



% to I /4 inches in length. Both ends turned up (can be rocked back and 

 forth on a flat table). Orifice toward the anterior end, keyhole in shape. 

 Color a faded magenta. Interior whitish, tinged with pale-green or pink. 

 Inner callus of orifice white with a narrow red line. Uncommon in Florida. 



Superfamily PATELLACEA 



Family ACMAEIDAE 



Subfamily ACMAEINAE 



Genus Lottia Sowerby 1833 



Lottia gigantea Gray Giant Owl Limpet 



Plate 18) 



Crescent City, California, to Lower California. 



3 to 4 inches in maximum diameter, oval in outline, low, with the apex 

 close to the front end. Exterior dirty-brown, rough, commonly stained with 

 algal green. Interior glossy, with a wide, dark-brown border. Center bluish 

 with an "owl-shaped" whitish to brownish scar in the very center. Very 

 common at or above high tide line where the sea spray may reach them. In 

 the south they grow to a large size. Frequently polished and used as sou- 

 venirs. 



Genus Acmaea Eschscholtz 1830 

 Subgenus Acmaea s. str. 



Acmaea mitra Eschscholtz White-Cap Limpet 



Plate i8r 



Alaska to Lower California in cold water. 



I inch in maximum diameter, thick, pure white, conic in shape, and with 

 an almost round base. x\pex pointed and near the center. Often covered with 

 small, knobby nuUipore growths. Commonly washed ashore. It lives in cold 

 water below the low ride level. 



