EXPLANATION OF PLATE 24 



All figures natural size , 



Fig. 1. Ficus rodeoensis, n. sp. Back view of east. Univ. Calif. Loe. 1176. 



Fig. 2. Trophosycon stanfordense (Arnold). Back view of cast, on which 

 the nodes, and excavation below anterior row of nodes, are unusually promi- 

 nent. Univ. Calif. Loc. 1243. 



Fig. 3. Trophosycon stanfordense (Arnold). Aperture view of cast. Univ. 

 Calif. Loc. 1243. 



Figs. 4, 5 and 6. Trophosycon kernianum Cooper. Shows back and aperture 

 views of nearly perfect adult specimens and back view of immature specimen. 

 Cal. Acad. Sci. Loc. 64, Barker's Ranch, Kern County. 



[254] 



