118 MOLLUSC A. 



Subphylum B. Glossophora. 



Head-region developed. An odontophore. 



Class I. Scaphopoda. 



Possess an ill-developed head, a trifid foot, and a curved tubular shell. 

 Two bunches of gill-filaments, but no heart or eyes. Sexes separate and 

 gonad unpaired. Dentalium. 



