EXPLANATION OF PLATE 13 



Eocene of Marysville Buttes 

 Fig. 1(7. Olivula marysvillensis, n.sp. X4. 

 Fig. lb. Olivula marysvillensis, n.sp. X4. 

 Fig. 2a. Architectonica weaveri, n.sp., top view. X2i/^. 

 Fig. 2b. Architectonica weaveri, n.sp., side view. X 2. 

 Fig. 3a. Caricella stormsiana, n.sp., mouth view. X2. 

 Fig. 3b. Caricella stormsiana, n.sp., back view. X2. 

 Fig. 4a. Oliverato calif ornica Cooper, back view. X3. 

 Fig. 4b. Oliverato ealifornica Cooper, mouth view. X3. 

 Fig. 5. Phos(?) martini, n.sp. X2. 



Fig. 6a. Turritella merriami, n.sp., spire of young specimen. X3. 

 Fig. 6b. Turritella merriami, n.sp., back view of lower whorls. X' 

 Fig. 6c. Turritella merriami, n.sp. X2. 



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