PLATE XVI. 



Fig. I. Teeth of radula of Rimella Tyleri Ads. 



Fig. 2. Teeth of radula of Rostellaria Poivisii Reel. 



Fig. 3. Teeth of radula of species probably belonging to Trichotropidae. 



Fig. 4. Teeth of radula of Quoyia decollata Quoy & Gaimard. 



