1914] Dickerson : Fauna of the Martinez Eocene of California 137 



rounded; anterior broadly rounded; ventral margin nearly straight. 

 A marked, rounded ridge nearly parallels the posterior dorsal margin. 



Dimensions. — Length, 13.5 mm.; height, 10 mm. ; convexity, 2 mm. 



This species is very similar in form to T. hoffmaniana Gabb which 

 was figured in volume 1, Palaeontology of California (see fig. 113fl, 

 pi. 22), but Gabb has undoubtedly confused two different species in 

 this case, as figure 133 is very different. All the specimens from 

 Pence's Ranch in the University of California Cretaceous collections 

 correspond to figure 133, which we will regard as T. hoffmaniana 

 Gabb, a Chico form. 



Occurrence. — University of California Locality 784. 



Named for its occurrence near Herndon Creek, Lake County, Cali- 

 fornia. 



TELLINA PACKAEDI, n. sp. 

 Plate 11, figure 11 



Shell large, nearly equilateral, compressed ; anterior end evenly 

 rounded ; posterior end angulated in middle ; beak central, small ; sides 

 making an angle of 110° at the umbo; anterior dorsal margin slightly 

 convex with abrupt slope nearly equal to that of the straight posterior 

 dorsal margin ; ventral margin broadly rounded ; surface marked by 

 concentric lines of growth. 



Dimensions. — Length, 36 mm. ; height, 30 mm. ; convexity, 4 mm. 



Occurrence. — University of California localities 790 and 784, near 

 Lower Lake. 



This species differs from T. parilis Gabb, T. aequalis Gabb, and 

 T. lorenzoensis Arnold in its smaller umbonal angle and in its pro- 

 portionally greater height. 



Named in honor of Mr. Earl Packard. 



TELLINA PEREINI, n. sp. 

 Plate 11, figure 8 



Shell long, very narrow; beaks small and located two-fifths of the 

 shell-length from the anterior end ; anterior dorsal slope straight, with 

 gentle slope toward the rounded anterior end ; the steeper posterior 

 dorsal slope is slightly concave from beaks outward to half its length 

 and then it becomes convex ; posterior extremity very angular ; basal 

 margin narrowly arcuate; lunule and escutcheon, long and narrow. 



