197 
CERITHXUM cornucopiae. 
TAB. CLXXXYIII.— Figs, i, 3, and 4. 
Spec. Char. Turrited, subulate, punctated ; whorls 
very numerous, superior ones with 3 or 4 un- 
equal tuherculated carinae, central ones tuber- 
culated above, undulated below, with 4 or 5 
transverse furrows ; lowest whorls crossed by 
9 or 10 elongated tubercles ; aperture quad- 
rate ; columella plaited ; beak short, curved. 
So different are the several parts of an entire adult shell 
of this Cerithium, that fragments may be taken for dis- 
tinct species. The whorls close to the apex have only 
one carina placed a little below the middle, and crenu- 
lated : in the succeeding 1 whorls the upper edge gradu- 
ally becomes tuberculated, a small knotted keel rises 
between it and the central one, and the lower edge ap- 
pears crenulated : by degrees the tubercles on the upper 
edge increase in size, the central carina becomes flatter, 
and other carinae arise on each side of it : near the 
middle of the shell these carinae all become broader, and 
the spaces between them assume the form of furrows ; 
the tubercles and crenulations remain in the form of 
waves : in the mean while the tubercles upon the upper 
edge are elongated, and towards the interior part of the 
shell join the waves below them, displacing the furrows 
by degrees, till having receded from the edge in the 
three or four last turns, they occupy the whole whorl in 
the form of blunt, oblong, rather oblique knobs. The 
minute hollow punctums that are dispersed over the 
whole surface are disposed in lines that diverge as they 
rise over the tubercles, and converge again as they de- 
