EXPLANATION OF PLATE 46 



Fig. 1. Pecten (Pecten) raymondi, n. sp. Eight valve. A very common 

 species in the San Pablo and the Seutella breweriana zone. Believed to be 

 characteristic of the Upper Miocene. Longitude, 43 mm. Natural size. 



Fig. 2. Pecten (Pecten) raymondi, n. sp. A very large specimen of the 

 convex left valve. Longitude, 50 mm. Figure slightly enlarged. 



Fig. 3. Pecten (Lyropecten) crassicardo Conrad nov. var.? Eight valve. 

 Longitude, 132 mm. Approximately two-thirds natural size. 



