CHAPTER IX 



Dentaliums and Other 

 Tusk-Shells 



Class SCAPHOPODA 



Family SIPHON ODENTALUDAE 



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 



Figure 69a 



North Carolina to Florida and to Texas. 



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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