148 CONCHOLOGY. 



terminated by a short, open canal ; the colunnellar edge less 

 hollowed than the right, and covered with a callosity ; oper- 

 culum horny, oval, rounded, and rather large. 



T. variegatus. The trumpet Triton. PI. 26, fig. 5. 



The smoothest species, oblong, ventricose, tubiform ; 

 aperture dilated ; suture of the spire crenulated ; pillar lip 

 grooved obliquely ; colour pale purple, clouded and spotted 

 with brown. 



T. cutaceus. The rough-skin Triton. 



Species with spire rather short, always very tuberculated, 

 often umbilicated ; a sinus at the posterior junction of the 

 two edges. 



T. anus. The grinning Triton. 



Species similar to the T. cutaceus, but having the aper- 

 ture surrounded by a thin dilated membrane and irregular 

 teeth. 



