PLATE XXXIII. 



** In the mud appeared a species pf Turbo^ which, though very 

 similar to T. Littoreus (the common Periwinkle), has some cha- 

 racters that seem to authorize its being considered as a different shell. 

 The anfractus are much more swollen, as it were, than in the above 

 species ; the spire is more depressed ; and, besides, there is no ap- 

 pearance of strue, either transversely or longitudinally. This shell 

 has a sort of distorted or rude contour, that may, perhaps, entitle it to 

 the appellation of T. Rudis, Its colour is greenish," Page 277, 

 Volf If 



