152 University of California Publications in Geology [Vol. 11 



Family Tellinidae 



Genus TELLINA Linnaeus 



TELLINA LORENZOENSIS Arnold 



Tellina lorenzoensis Arnold, Proc. IT. S. Nat. Mus., vol. 34, no. 1617, p. 367, 

 pi. 33, fig. 1, 1908. 



Macoma lorenzoensis Arnold, Arnold and Hannibal, Proc. Amer. Philos. 



Soc, vol. 52, p. 583, 1913. 

 Tellina lorenzoensis Arnold, Clark, Univ. Calif. Publ., Bull. Dept. Geol., 



vol. 9, no. 2, p. 15, 1915. 



This is a common species in the Kirker tuffs of the Sobrante Ridge 

 section ; it is also very common in the Kirker formation on the north 

 side of Mount Diablo. 



TELLINA OREGONENSIS Conrad 

 Plate 13, figures 1 and 4 



1848; Amer. Jour. Conch., vol. 1, p. 152, 1865. 

 Tellina oregonensis Conrad, Amer. Jour. Sci., ser. 2, vol. 5, p. 432, fig. 5, 



1848- Amer. Jour. Conch., vol. 1, p. 152, 1865. 

 .'Macoma nasuta Gabb, Geol. Surv. Calif., Palaeontology, vol. 2, p. 93, 1868; 



not Macoma nasuta Conrad, 1837. 

 Tellina oregonensis Conrad, Dall, U. S. Geol. Surv., Prof, paper no. 59, 



p. 124, 1909. 



Tellina oregonensis Conrad, Smith, Proc. Calif. Acad. Sci., ser. 4, vol. 3, 

 p. 178, 1912. 



Tellina oregonensis Conrad, Weaver, Wash., Geol. Surv., Bull. 15, p. 18, 

 1912. 



Tellina oregonensis Conrad, Arnold and Hannibal, Proc. Amer. Philos. Soc, 



vol. 52, pp. 583, 588, 1913. 

 Tellina oregonensis Conrad, Clark, Univ. Calif. Publ., Bull. Dept. Geol., 



vol. 9, no. 3, pp. 15, 18, 1915. 

 Tellina oregonensis Conrad, Dickerson, Proc. Cal. Acad. Sci., ser. 4, vol. 7, 



p. 16, pi. 29, fig. 4, 1917. 



Tellina oregonensis Conrad apparently has a rather long range for 



a species of this genus ; it extends from the Oligocene into the Upper 



Miocene; it is very common in the Scutella breweriana beds, Briones 



formation of Contra Costa County, the fauna of which has a stronger 



affinity with that of the Upper Miocene than with the fauna of the 



Lower Miocene ; it is common in the Area montereyanu zone in Contra 



Costa County, California, and is reported in the same horizon in 



Oregon and Washington ; it is also found in the Oligocene of Oregon 



and "Washington. The following is Conrad's original description: 



Elliptical, thin, much compressed; valves flattened and having regular con- 

 centric fine lines ; anterior submargin somewhat angulated, margin nearly direct, 

 truncated; beaks rather nearest to the anterior extremity; posterior end acutely 

 rounded. 



In the east, an oblique shallow furrow meets the apex on the posterior side. 



