EXPLANATION OF PLATE 7 

 Fig. 1. Natica (Neverita) convexa, n. sp., front view, natural size. 

 Fig. 2. Natica (Neverita) convexa, n. sp., posterior view, natural size. 

 Fig. 3. Calliostoma etchegoinensis, n. sp., posterior view, natural size. 

 Fig. 4. Purpura turns, n. sp., natural size. 



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