138 



University of California Publications in Geology 



[Vol. 8 



A straight line which extends from the beaks to the sharp angular 

 posterior extremity marks a prominent umbonal slope. The space 

 between this slope and the posterior dorsal margin is decidedly con- 

 cave. Surface of shell marked by concentric lines of growth. 



Dimensions. — Length, 33 mm. ; height, 11 mm. ; convexity, 2 mm. 



This species can be distinguished from all other West Coast Eocene 

 forms of the genus, Tellina, by its great length and marked umbonal 

 slope. 



Named in honor of Professor James Perrin Smith of Stanford 

 University. 



TELLINA KEWI, n. sp. 

 Plate 12, figure 1 



Shell medium, thin, broad, slightly convex, very inequilateral, but 

 longer than high; beak small, incurved; posterior and anterior dorsal 

 margins nearly straight, the posterior sloping the more abruptly ; 

 anterior end very broadly rounded ; posterior end produced and 

 pointed; ventral margin broadly rounded, more prominent beneath 

 the beaks, and curving from this point abruptly upward to the pointed 

 posterior end. Surface plain, or marked with simple growth lines. 

 This species was probably described and refigured by Gabb 32 in the 

 second volume of Palaeontology of California, as Tellina hoffmaniana. 

 He says: "This rather variable species is extremely common in the 

 Martinez group at Martinez, and has been found in the Chico group 

 at Pence's Ranch, as well as in the Tejon group at Griswold's. I 

 have now a single specimen from the latter group from Martinez 

 associated with Turritella uvasana, and other characteristic species. 

 The present figure illustrates a common, and one of the most marked 

 forms of the Martinez group, Martinez, from the same bed with 

 Pugnellus hamulus.'" The old State Geological Survey specimens now 

 in the collection of the University of California show, upon careful 

 examination, a decided difference between the Chico forms from 

 Pence's Ranch and the ones from Martinez. Several forms which 

 Gabb described from Division A near Martinez have since been proved 

 to be Martinez or Tejon forms. The appearance of the Chico and 

 Martinez sandstones are sometimes very much alike and, if he collected 

 near the Chico-Martinez contact, it is quite likely that he did not 

 distinguish the difference and so placed T. hoffmaniana with the Chico 



32 Gabb, Wm., Geological Survey of California, Palaeontology, vol. 2, p. 182. 



