146 BOOK OF SPECIES. 
A. TUBERCULOSA. Large, involute, thin, 
white; the sides with tuberculiferous transverse 
wrinkles ; the tubercles of the keels very promi- 
nent and conic ; aperture wider in proportion than 
the last. W. 13.2. 
CARINARIA. 
Univalve, conical, compressed at the sides, uni- 
locular, very thin, hyaline ; apex spiral; back 
sometimes with a dentated carina; aperture 
oblong, entire. 
C. virrEA. W. Argonauta. 13. 6. 
THE END. 
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