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CHAPTER IX
Dentaliums and Other
Tusk-Shells
Class SCAPHOPODA
Family SIPHONODENTALUDAE
The tusk-like shell is generally swollen in the middle and is entirely
smooth. The foot is worm-like and can be expanded at the end into a
round disk. The median tooth of the radula is almost as long as wide.
Genus Cadulus PhiHppi 1844
Shell small, white, without sculpture and swollen in the middle some-
what like a cucumber. Aperture constricted and very oblique. The genus
is divided into four subgenera as follows:
Apex with 2 deep slits Dischides ]t&.vtys i^6-]
Apex with 4 deep slits Polyschides Pilsbry and Sharp 1 897
Apex with 2 or 4 shallow slits Platyschides Henderson 1920
Apex without slits:
Obese, convex on both sides Cadulus s. str.
Slender, almost flat on one side Gadila Gray 1 847
Subgenus Polyschides Pilsbry and Sharp 1897
Cadulus carolinensis Bush Carolina Cadulus
North Carolina to Florida and to Texas.
Figure 69a
10 mm. in length. Slightly swollen. Apex with 4 shallow slits. In cross-
section the shell is roundish. Commonly dredged from 3 to 100 fathoms.
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