178 



University of California Publications in Geology [Vol. ll 



Fusinus hecoxi is closely related to Fusinus chehalisensis (Wea- 

 ver). 145 The species, listed by Arnold and Hannibal 140 as Priscofusus 

 hecoxi from the San Lorenzo horizon of their Astoria series, is Fusinus 

 chehalisensis (Weaver). Weaver, in a recent paper, threw out his 

 own species, F. chehalisensis, described by him as a Drillia, and placed 

 it as a synonym of Arnold's species, F. hecoxi, listing it, however, 

 under the genus Drillia rather than Fusinus. The form, described 

 by Weaver as Drillia chehalisensis and listed here as Fusinus chehalis- 

 ensis, which form is common in the Lower Oligocene of Oregon and 

 Washington, is very distinct from F. hecoxi Arnold. The spire is 

 higher, the canal shorter and the area below the suture of the body 

 whorl more strongly depressed. On F. chehalisensis the longitudinal 

 sculpturing consists of broad longitudinal ribs, which, on each rib, 

 begin just below the appressed collar and extend almost, if not quite, 

 to the suture in front. On F. hecoxi, well-defined nodes near the 

 middle of each whorl take the place of the longitudinal ribs seen on 

 the other species. 



FUSINUS (EXILIA) LINCOLNENSIS (Weaver) 



Plate 23, figure 10 



Exilia lincolnensis Weaver, Univ. Wash. Publ. Geol., vol. 1, no. 1, pp. 51-52, 

 pi. 4, figs. 49-50, 1916. 



The specimen of Fusinus lincolnensis, figured in this paper, was 

 found by John Ruekman near the top of what is known as the white 

 shale in the East field, about fifteen miles north of Coalinga. These 

 beds, in a recent paper by Robert Anderson and Robert W. Pack, 147 

 were given the name of Kreyenhagen shale and provisionally placed 

 in the Oligocene. Previous to this they had been referred to by 

 Arnold and Anderson 148 as questionably Eocene. The following 

 species were found associated with Fusinus lincolnensis in these beds : 

 Macrocallista cf. pittsburgensis Dall, Pecten peckhami Gabb and Leda 

 lincolnensis Weaver. F. lincolnensis is found in a collection at the 

 University of California from the type section of the San Lorenzo. 



145 For original description of Fusinus chehalisensis, see Wash. State Geol. 

 Surv., Bull. 15, p. 78, pi. 6, figs. 65, 66, 1912. 



* 4 « Arnold and Hannibal, Proe. Amer. Philos. Soc, vol. 52, p. 581, 1913. 



1*7 Anderson, Robert, and Pack, Robert W., Geology and oil resources of the 

 west border of the San Joaquin Valley, north of Coalinga, U. S. Geol. Surv., 

 Bull 603, pp. 76-78, 1915. 



us Arnold, Ralph, and Anderson, Robert, Geology and oil resources of the 

 Coalinga District, U. S. Geol. Surv., Bull. 398, pp. 73-74, 1910; also, Arnold, 

 Ralph, Palaeontology of the Coalinga District, U. S. Geol. Surv., Bull. 396, p. 00, 

 1909. 



