100 American Seashells 



Subfamily FISSURELLINAE 



Genus Fissurella Bruguiere 1789 



Subgenus Creviides H. and A. Adams 1854 



Fissurella nodosa Born Knobby Keyhole Limpet 



Plate I yd 



Lower Florida Keys and the West Indies. 



I to 1% inches in length. 20 to 22 strongly nodulated, radial ribs. Mar- 

 gin sharply crenulated. Interior pure-white. Orifice oblong. An intertidal 

 rock-dweller. Uncommon in Florida and the Bahamas; abundant in the West 

 Indies. 



Fissurella barhadensis Gmelin Barbados Keyhole Limpet 



Plate lyf 



Southeast Florida, Bermuda and the West Indies. 



I to 1/4 inches in length. With irregular radiating ribs. Orifice almost 

 round. Inside with green and whitish concentric bands. Border of orifice 

 deep-green with a reddish-brown line. Outside grayish white to pinkish buff, 

 generally with purplish lines between the small ribs. Commonly blotched 

 with purple-brown. Lives on wave-dashed rocks. Common. 



A similar, rather rare species, F. angusta Gmelin, also intertidal and fre- 

 quently covered with calcareous algae, occurs on the Florida Keys. The 

 shell is flattish, pointed in front, and its internal callus is light-brown to red- 

 dish brown, but not bounded by a reddish line as in barbadensis, 



Fissurella rosea Gmelin Rosy Keyhole Limpet 



Plate I ye 



Southeast Florida and the West Indies to Brazil. 



I inch in length, thin, flattish, narrower at the anterior end. Orifice 

 slightly oblong. Many radiating, small, rounded riblets. Color of alternating 

 whitish to pale-straw and pinkish rays. Interior pale-green at the margins, 

 blending to white in the center. Green orifice callus bordered by a pinkish 

 line. Common in beach drift. Do not confuse with the larger, more elevated 

 F. barbadensis. 



Fissurella volcano Reeve Volcano Limpet 



Plate 1 8c 



Crescent City, California, to Lower Cahfornia. 



% to I inch in lengtli, Y^ to almost /4 as high. Orifice at the very top, 

 very slightly nearer the somewhat narrower anterior end, and elongate with 

 deep, flat inner sides. Sculpture of numerous rather large, but low and 



