EXPLANATION OF PLATE 8 



Fig. 1. Aniigona {Ventricola) undosa, n. sp. Type, no. 11134, Coll. Invert. 

 Palae. Univ. Calif., loc. 14. Right valve, natural size. 



Fig. 2. Antigona (Ventricola) undosa, n. sp. Same specimen as fig. 1, view 

 of dorsal areas, natural size. 



Fig. 3. Antigona (Artena) neglecta, n. sp. Type, no. 11135, Coll. Invert. 

 Palae. Univ. Calif., loc. 14. Left valve, natural size. 



Fig. 4. Antigona {Artena) neglecta, n. sp. Same specimen as fig. 3, showing 

 anterior view. Natural size. 



Fig. 5. Antigona {Ventricola) undosa, n. sp. No. 11136, Coll. Invert. Palae. 

 Univ. Calif., loc. 14. Eight valve, natural size. The heavy concentric undulations 

 are better preserved on this specimen than on the one shown in fig. 1. 



Fig. 6. Antigona {Artena) neglecta, n. sp. No. 11138, Coll. Invert. Palae. 

 Univ. Calif., loc. 1131. Natural size. 



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