l8o CALIFORNIA ACADEMY OF SCIENCES. [Proc. 30 Ser. 



EXPLANATION OF PLATE XXI IL 



AH figures natural size. 



Cytherea (?) Newconibei Merriam. 



Doubtful hinge of right valve of Cytherea ( ? ) Newconibei. 



Cytherea Vancoiivercnsis Merriam. 



Nassa Neivcombei Merriam. 



Patella geometrica Merriam. 



Bnllia buccinoides Merriam. 



