FAMILY 8. CANALIFERA. 183 
Pl. CCXXX. Fig. 18. 
CANCELLARIA LITTORINIFORMIS, Sowerby, Conch. Illus. Cat., p. 3. no.17. 
FASCIOLARIA, Lamarck. 
Testa subfusiformis, interdum magnitudine perampla, spira acuminata, 
anfractuum peripheria sepissimé nodulosa ; apertura elongata, labro 
interdum crenato, fauce nonnunquam lineata ; columella levi, crassa, 
ad basem obliqué plicata, in canalem sublongum, rectum, desinente ; 
plicis duabus ad quatuor, inferioribus majoribus. 
The genera Fasciolaria, Fusus, and Turbinellus are very closely allied to 
each other: there are, indeed, many species so intermediate in their cha- 
racters, that the naturalist is somewhat puzzled to determine to which 
genus they belong. The typical forms of these divisions are, however, 
well and clearly defined. The Turbinelli, as we have already shown, have 
sometimes a bucciniform, sometimes a fusiform shell, but it is always 
more or less distinctly characterized by the plaits running transversely 
across the columella. The Fasciolariz have a long shell closely resem- 
bling that of the fusiform Turbinelli, but distinguished by the different 
disposition of the plaits ; for instead of running transversely, they run ob- 
liquely down the columella, almost into the canal, and are both fewer 
and more lightly developed. The Fusi may perhaps be the most easily 
determined, because the columella is not plaited at all: we are, however, 
compelled to admit certain species into that genus which present very 
strong indications of plaits, as well as certain others into the genus Fascio- 
laria, in which the plaits are almost obsolete ; whilst we find many spe- 
cies that may be strictly referred either to the genus Fasciolaria or Turbi- 
nellus, in consequence of the columellar plaits being transversely oblique, 
or obliquely transverse. Linnzus regarded the canal as the most im- 
portant character in the Fasciolariz, and therefore included them in the 
same genus with the Murices; he omitted, however, to notice an im- 
