199 
CERITHIUM giganteum. 
TAB. CLXXXVIII.---F/g\ 2. 
Syn. C. giganteum. Lamarck Env. de Paris , 
p. 95. Knorr, HI. tab . 107, /. 1 . 
Parkinson Org. Pern . ///. 71. 
Spec. Char. Turrited, extremely long, transversely 
striated, minutely punctated ; upper parts of 
the whorls tuberculato-nodose ; columella uni- 
plicated. 
According to De Lametherie, 30 inches is a length 
sometimes attained by this gigantic shell, the diameter 
of the last turn being then 1 \ inches. Unlike the last, 
this Cerithium is nearly uniform throughout its length ; 
it differs from every part of it in the position of the tu- 
bercles, which are confined to the upper parts of the 
whorls : below the tubercles are 6 or 7 transverse strite 
at equal distances from each other ; while in those whorls 
of the C. cornucopia} which have striae below the tuber- 
cles, they are but five, and at unequal distances. This 
is also more taper than C. cornucopiae. 
It was not until I had described the preceding, that I 
discovered, upon comparing two specimens sent me by 
Mr. Holloway, very carefully, with an authentic one of 
C. giganteum, given me by Mr. Parkinson, that Mr. 
Holloway’s were distinct from each other ; and that the 
smaller one, although much worn, still retained charac- 
ters enough to prove it to be the giganteum. It is ex- 
traordinary, that two species, hitherto met with in different 
parts of France, should be found together on the English 
coast. The worms that have committed such ravages 
upon both species, have in the specimen before us been 
more limited in their operations, confining them to 
straight lines, that branch in a dichotomous manner. 
