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HALIOTIS. 
CHARACTER GENERICUS. 
Testa univalvis, depressa, auriformis ; discus multiper- 
foratus; apex spiralis, spira sublaterali-dorsali aut 
subdorsali ; os ovale, patulum, integrum. 
ANIMAL gasteropodum; caput conicum truncatum ; 
tentacula quatuor ineequalia, majoribus acutis, mino- 
ribus ad apicem oculigeris ; pes magnus. 
EARSHELL. 
GENERIC CHARACTER. 
Shell univalve, depressed, ear-shaped ; disk with many 
perforations ; apex spiral, the spire almost lateral-dorsal, or 
subdorsal ; mouth oval, spreading, entire. 
Anima with a large foot on its belly; head conic, 
truncate ; tentacula four, unequal, the larger ones acute, 
the smaller ones bearing eyes at their extremities. 
The Earshells adhere to rocks in the same manner as 
Limpets ; but all the species (as far as I can learn) inhabit 
deep water, and generally at a short distance from the 
shore. 
