Vol. N'll] WARINC—STRATIGRAPHIC AND FAUNAL RELATIONS 79 



Shell medium size, thick, oblique, curved; ventral valv^e 

 larger and more convex than the upper; surface rough and 

 somewhat squamose. Loc. 5. This species occurs also in the 

 Tejon formation. L. S. J. U. Pal. Coll. 



Periploma undulifera (Gabb) 



Tellina undulifera Gabb, Pal. Gal, vol. 2, p. 183, pi. 30, 

 fig. 74. 



Shell medium size, thin, convex, inequilateral, broadly 

 rounded in advance, tapering behind ; beaks about two-fifths 

 of length from anterior end and rather sharp; anterior cardinal 

 margin sloping rapidly, posterior cardinal margin sloping, with 

 slight convexity, gradually to posterior sharply curved end; 

 basal margin broadly rounded and sloping upwards with 

 slight convexity, to posterior end; surface marked by broad 

 rounded concentric ribs which are somewhat undulate. Loc. 5. 

 L. S. J. U. Pal. Goll. 



Septifer elegans, new species 

 PI. 14, Fig. 2 



Shell small, oblique, subquadrate ; cardinal margin straight, 

 anterior and posterior submargins subparallel, base irregularly 

 convex ; anterior side abruptly truncated, at an acute angle, to 

 rest of surface; surface marked, posterior to this angle, by 

 many fine radiating ribs. This species differs from 5". 

 dichotomus Gabb*^ in having fine radial sculpture. 



Myfilus dichotomus Cooper *^ is probably of this species. 



Loc. 8. This species occurs also in the Martinez. L. S. J. U. 

 Pal. Coll. 



Solen stantoni Weaver 



5. stantoni Weaver, Bull. Dept. Geol. Univ. Cal, vol. 4. 

 p. 116, pi. 12, fig. 1. 



Shell thin, elongated, moderately convex; cardinal margin 

 straight and nearly parallel to the slightly convex basal margin ; 

 posterior margin rounded and gaping; anterior margin 

 crumpled and basal margin tapered to it; beak anterior, a 



"Pal. Cal., vol. 1, p. 186, pi. 30. fig. 261. 



" Cal. State Min. Bureau, Bull. no. 4, p. 49, pi. S, fig. 64. 



