Geol.— Vol. I.] CHAPMAN— CALIFORNIAN FORAMINIFERA. 255 



Rotalia Lamarck [1804]. 

 Rotalia orbicularis iVOrhigny. 



Plate XXX, Fig. 12. 



Rotalia (Gyroidina) orbicularis d'Orbigny, 1826, Ann. Sci. nat., Vol. VII, 



p. 278, No. I, Modele, No. 13. 

 Rotalia orbicularis Brady, 1864, Trans. Linn. Soc. Lond., Vol. XXIV, p. 



470, PI. XLVIII, fig. 16. Id., 1884, Chall. Rept., Vol. IX, p. 706, PI. 



CVII, fig. 5; PI. CXV, fig. 6. 



The range of R. orbicularis is throughout the Tertiary 

 formations. 



It occurs in the Miocene of Southern Italy and of 

 Norfolk, Virginia, and in the Older Pliocene of Monte 

 Bartolomeo. 



California, in both samples; common. 



Subfamily POLYSTOMELLIN^. 



Nonionina d' Orhigny [ 1826] . 



Nonionina communis cV Orhigny. 



Plate XXX, Fig. 13. 



Nonionina coniuiunis vt'OvjiXGHW , 1826, Ann. Sci. nat.. Vol. VII, p. 294, No. 

 20. Id., 1S46, Foram. Foss. Vienne, p. 106, PI. V, figs. 7 and 8. 



Amongst other occurrences this species has been recorded 

 from the Older Pliocene of Monte Bartolomeo. 



Santa Clara County, California; frequent. 

 Nonionina boueana d'Orbigny. 



Plate XXX, Fics. 14 and 14a. 



Nonionina boueana d'Orbigny, 1846, Foram. Foss. Vienne, p. 108. PI. V, 

 figs. II and 12. Brady, 1884, Chall. Rept., Vol. IX, p. 729, PI. CIX, 

 figs. 12 and 13. 



The specimens here figured are very pretty and extreme 

 variations of the type, having the thickened sutures very 

 distinct, the peripheral edge sharp, and the septal face with 

 limbate edges. 



