482 University of California Publications in Geology I Vol. 9 



CRASSATELLITES LILLISI, n. sp. 

 Plate 36, figure 10 



Shell solid, small, trigonal, with prominent, central beaks; the 

 anterior dorsal margin concave, sloping gently to a rounded anterior 

 end ; the posterior dorsal margin straight and sloping to a narrowly 

 pointed posterior ; ventral margin, broadly rounded ; lunule large, but 

 obscure in type specimen ; fine concentric, incremental lines decorat- 

 ing the shell. 



Only the type specimen is known. It is easily distinguished 

 from C. grandis Gabb by its greater length and by the gentler 

 slopes of its dorsal margins. 



Named in honor of Miss Helen Lillis, who donated much material 

 obtained from the type locality of this species. 



Dimensions. — Height, 19 mm. ; length, 26 mm. 



Occurrence. — University of California Locality 1817, Fresno 

 County California, near base of the Tejon group. 



CARDIUM MARYSVILLEXSIS Dickerson 



Cardium dalli Dickerson, Fauna of the Eocene at Marysville Buttes, Cali- 

 fornia, Univ. Calif. Publ. Bull. Dept. Geol., vol. 7, p. 269, 1913. 



A new name is necessary for this species, as Heilprin had pre- 

 viously named a Cardium in honor of W. II. Dall. Renamed for 

 its occurrence at Marysville Buttes, California. 



GLYCIMERIS PERRINI, n. sp. 

 Plate 36, figures 6a, 6b, 6c 



Shell medium in size, nearly equilateral, cordate ; beak small, 

 prominent, slightly incurved, area very small ; base broadly rounded ; 

 anterior end straight and slightly shorter than the posterior end. 

 The base is denticulated on interior. Shell is decorated by numerous 

 fine rounded radiating ribs which vary greatly in strength over 

 various portions of the shell. Some of the ribs are dichotomous. 

 Interspaces are very narrow. Concentric lines of growth cross 

 these ribs and on weathered specimens are very prominent. 



This species resembles Glycimeris cor (Gabb) in outline but the 

 ribs are more numerous and the interspaces are not flat and wide as 

 in G. cor. Its more trigonal form is sufficient to distinguish it from 

 G. sagittatus (Gabb). 



Named in honor of Professor James Perrin Smith of Stanford 

 University. 



