21. Mammal bone Bookmark Mammal bone, museum number 1-11341.1. Search result 21 Museum number: 1-11341.1 Object class: Mammal bones Collector: A. V. Wepfer and Nels C. Nelson Collection place: CA-CCo-295, Richmond, Contra Costa County Collection date: June-July 1906 Taxon: Phoca vitulina