488 University of California Publications in Geology [Vol. 9 



ACTAEON MOODYI, n. sp. 

 Plate 38, figures 10a, 10b 



Shell ovate ; spire low, conical ; whorls five and a half, the first 

 two being smooth nuclear. The shell is decorated by strong, evenly 

 spaced, equal spiral lines, four of which mark the third whorl, five 

 the fourth, and about eighteen the body-whorl. Whorls convex, 

 rounded; suture linear; mouth suboval ; outer lip simple; columella 

 marked by the faint single plait of this genus. 



Named in honor of Mr. Wilbur Moody, Field Geologist, Southern 

 Pacific Company. 



This species is higher and less globose than A. lawsoni of the 

 Martinez group and its spire is less acute. 



Dimensions. — Length, 9 mm. ; width of body-whorl, 5 mm. 



Occurrence. — University of California Locality 672. 



ACMAEA RUCKMANI, n. sp. 

 Plate 39, figure 3 



Shell small, low, nearly circular in outline ; apex subcentral, 

 slightly curving forward ; surface decorated by about 25 thread-like 

 radiating ribs, with flat interspaces three times as wide as ribs. Three 

 or four concentric growth lines cross the radial ribs. 



This species differs from A. tejonensis Gabb in its pronounced 

 radial decoration and in its nearly circular shape. 



Named in honor of Mr. John Ruekman, who aided the writer in 

 collecting at the above locality. 



Dimensions. — Length, 8 mm. ; width, 7 mm. ; height, 4 mm. 



Occurrence. — University of California Locality 2225, south side 

 of Oroville South Table Mountain. 



CHRYSODOMUS MARTINI Dickerson 

 Plate 39, figure 8 



Phos(;') martini Dickerson, Fauna of the Eocene at Marysville Buttes, 

 California, Univ. Calif. Publ. Bull. Dept. Geol., vol. 7, p. 288. 1913. 



The type of the species described under the above name was defec- 

 tive. Better specimens of this same species were found at University 

 of California Locality 2225, south side of Oroville South Table Moun- 

 tain. They have moderately long, curved, slender canals and other 

 characters of the genus Chrysodomus. 



