4 PALAEONTOLOGY OF CALIFORNIA. 



much smaller sized individuals of the Kansas shell have two or three more volu 

 tions than the species under consideration, and several more septa in each turn. 

 Locality. Bass's Eanch, Shasta County.* 



FUSULINA GRACILIS, Meek. 



PI. 2., Fig. 1, and 1 a, b, c. 



Shell small, very slender, cylindrical; volutions five to six. 

 Surface marked longitudinally by slight linear furrows, or faintly 

 impressed striae coincident with the septa within. Fissure un 

 known. Septa about twenty-five in the last or outer turn, very 

 strongly undulated laterally so as to come nearly or quite in con 

 tact at regular intervals, thus giving the interior, as seen in lon 

 gitudinal sections, a distinctly reticulated cellular appearance. 



Length, 0.20 inch; breadth, 0.05 inch. 



This is by far the most slender and regularly cylindrical species of the genus I 

 have seeii, its sides being parallel and without the slightest tendency to swell 

 out in the middle. It will be readily distinguished, by its form alone, from the 

 most slender individuals of F. cylindrica, or of any other known species, except 

 ing perhaps F. elongata of Shumard; and from that by its comparatively minute 

 size, since Shumard's species attains a length of one to two inches. 



Occurs associated with F. robusta. 



FUSULINA CYLINDRICA, Fischer? 



PL 2, Fig. 2, and 2 a, 



Fusulina cylindrica, Fischer. Oryct. Moscow, 1837, p. 126, pi. 18, fig. 1-5. 

 Fusulina depressa, Fischer. Ibid., pi. 13, fig. 6-11. 



Fusulina cylindrica, Murchison, De Verneuil and Keyserling. Geol. Rus. &c., 

 vol. ii, pt. 2, p. 16, pi. 1, fig. 1, a, b, c, d. 



Along with the foregoing there are a few weathered silicious specimens, having 

 exactly the form and agreeing in size with the above-cited species ; but the spe 

 cimens are not in a condition to warrant a very positive opinion in regard to their 

 identity with the Russian form. I suspect they will probably be found to be 

 distinct, but being unable, from the imperfect specimens examined, to point out 

 any characters by which they can be distinguished, I refer them provisionally to 

 that species. 



Length of a medium-sized specimen, 0.28 inch ; thickness of do., 0.10 inch. 



Occurs in a silicious mass with F. robusta. 



* All the species described or noticed in this section are from the limestone 

 belt, which crops out, forming a range of hills, east and northeast of Bass's Ranch, 

 Shasta County. J. D. W. 



