1915] 



Clark: Fauna of the San. Pablo Group 



473 



Named in honor of Mr. Walter English. 

 Dimensions. — Length, 40 mm.; height, 21mm. 



Occurrence. — From the Upper San Pablo Group on the south side 

 of Mount Diablo, University of California locality 481. 



TELLINA HANNIBALI, n. sp. 

 Plate 61, figure 11 



Shell medium in size; beaks inconspicuous, posterior to the middle. 

 Anterior dorsal margin nearly straight, becoming slightly convex 

 toward the anterior extremity ; posterior dorsal edge slightly convex, 

 the greatest amount of convexity coming just in front of the posterior 

 extremity ; posterior extremity pointed ; anterior end regularly 

 rounded ; ventral edge gently and regularly arcuate. Along the pos- 

 terior edge there is a narrow depressed margin which is separated 

 from the remaining portion of the surface by a fairly distinct line. 

 Surface smooth, except for irregular incremental lines. 



This species resembles T. merriami Weaver from the Miocene of 

 Washington. The writer has only one specimen of a right valve, and 

 more material may possibly show that it grades into that species. 



Named in honor of Mr. Harold Hannibal. 



Dimensions. — Length, 35 mm. ; height, 23 mm. 



Occurrence. — Prom the Upper San Pablo to the southeast of the 

 town of Walnut Creek. University of California locality 1942. 



MACOMA ANDEESONI, n. sp. 

 Plate 61, figure 12 



Shell elongate, subovate; beaks posterior to middle, inconspicuous. 

 Posterior dorsal edge slightly concave along ligamental groove, beyond 

 this nearly straight to slightly convex ; anterior dorsal edge long and 

 gently convex ; anterior end evenly rounded ; posterior end bluntly 

 pointed ; ventral edge gently convex anteriorly and nearly straight 

 posteriorly. On left valve along posterior margin is a narrow de- 

 pressed area, which is only obscurely separated from the main surface 

 of the valve ; it widens quite perceptably below the ligamental groove 

 into a flange, somewhat similar to though not so wide or distinct as 

 the flange seen on the posterior edge of M. secta Conrad, a Recent 

 species and one which is also found in the same horizon ; right valve 



