98 Ainerican Se ash ells 



Diodora mur'vna Arnold Neat-ribbed Keyhole Limpet 



Crescent City, California, to Magdalena Bay, Mexico. 



% inch in length, similar to aspera, but smaller, with a lower, more 

 rounded apex, with convex sides, a narrower shell, and with finer, much 

 neater cancellate sculpturing. Color white or with few, or many, broken 

 radial rays of gray-black. The apical hole is nearer the anterior end. Mod- 

 erately common on rocks. This is D. densiclathrata of authors, not of Reeve. 



Genus Lucapina Sowerby 1835 



Shell thin, low-conic, with the apex in front of the middle. Orifice 

 rather large, roundish. Margin finely crenulated. Fleshy mantle covers most 

 of the shell; foot larger than shell. 



Lucapina sowerbii Sowerby Sowerby's Fleshy Limpet 



Plate lyh 



Southeast Florida and the West Indies to Brazil. 



% inch in length, oblong in outline. With about 60 alternating large 

 and small radiating ribs. Also with 9 to 1 3 raised, concentric threads. Color 

 white to buff, with 7 to 9 small, splotched rays of pale brown. Inside whitish; 

 callus sometimes bounded by an olive-green streak. Outside of orifice not 

 stained. Uncommon under rocks at low tide zone. It has been erroneously 

 called L. adspersa Philippi. 



Lucapina suffusa Reeve Cancellate Fleshy Limpet 



Plate 17k 



South half of Florida and the West Indies. 



I to 1 34 inches in length, oblong in outline. Much like L. sowerbii, but 

 larger, a delicate mauve to pinkish, and with a bluish-black orifice. Inside 

 grayish to dirty-white. Not uncommon under rocks. Formerly called L. 

 cancellata Sowerby. 



Genus Lucapinella Pilsbry 1890 



Shell depressed, conical, less than % inch, with a large orifice and thick- 

 ened margins. 



Lucapinella limatula Reeve File Fleshy Limpet 



Plate lyi 



North Carolina to south half of Florida and the West Indies. 



% inch in length, resembling L. soiverbii, but smaller with a proportion- 



