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156 CONCHOLOGY. 
dified by the turn of the summit, and provided on each side with 
an ear-like appendage having thick and smooth edges. Inhabits 
the Mediterranean. Three species. 
Argonauta argo. Argonauta tuberculosa. 
A. nitida. 
2. Genus Carinaria. Pl]. XII. 
Animal. Body elongated, prolonged behind the nucleus inte 
a veritable tail, edged at its extremity by a vertical fin; head suffi- 
ciently distinct ; two, long, conical tentacula; two sessile eyes ; the 
organs of respiration and the nucleus entirely enveloped in a 
mantle with lobed edges. 
Shell. Very thin, symmetrical, a little compressed, without 
spire, but with the sumnit a little reflexed posteriorly ; aperture 
oval and entire. Inhabits the African, Mediterranean, and Aus- 
tralian seas. ‘Three species. 
Carinaria vitrea. Carinaria fragilis. 
C. cymbium. 
