1913] Dickerson: Fauna of Eocene at Marysville Buttes 283 



SIPHONALIA SUTTERENSIS, n.sp. 

 Plate 12, figure 1 



Fusiform ; whorls, nine or nine and a half. The first three 

 nuclear whorls are smooth while the rest are marked by ten or 

 eleven sharply pointed nodes. On the fourth to the ninth whorl 

 these nodes are crossed below the angle by three revolving ribs, 

 the one at the obtuse angle of whorl being the strongest. Two 

 or three riblets occur between the ribs. The portion of the whorl 

 above the shoulder is marked by riblets which alternate in size 

 and vary in number from eight or ten on upper whorls to fifteen 

 to twenty on the body-whorl. This portion is concave and on the 

 body whorl is channeled as well. The concavity and channeling 

 are variable in amount. The canal is decidedly bent laterally. 

 Inner lip smooth and bent ; outer lip crenulated on interior ; 

 umbilicus small, ovate. 



University of California Locality 1853. Named for its oc- 

 currence in Sutter County, California. 



Dimensions : Length, 24mm ; width of body- whorl, 11mm. 



ASTYRIS, sp. 

 Plate 12, figure 4 



Shell spindle-shaped with eight whorls. The first two whorls 

 turbinate, smooth. The third, fourth, fifth, sixth, and seventh 

 whorls smooth or marked with microscopic revolving lines; flat 

 sided ; the body-whorl rounded and marked by fine revolving rib- 

 lets. Outer lip broken, inner lip smooth. Canal, long for this 

 genus. 



University of California Locality 1853. Only two small 

 specimens were found. 



Dimensions : Length, 7mm ; width of body-whorl, 3mm. 



CLAVELLA TABULATA, n.sp. 

 Plate 12, figure 7 



Shell robust, fusiform with at least nine whorls. The whorls 

 are flattened parallel with the axis of the shell, tabulate above 

 a very marked shoulder, a few rather fine revolving lines occur 

 on some of the whorls just beneath the angle. Suture impressed. 



