Geol— Vol. I.] CHAPMAN— CALIFORNIA N FOR A MINIFER A. 25 1 



Cristellaria arcuata d'Orhigny. 

 Plate XXX, Fig. 2. 



Cristellaria arcuata d'Orbigny, 1846, Foram Foss. Vienne, p. 87, PI. Ill, 

 figs. 34-36. Egger, 1857, Neues Jahrbuch fiir Min., p. 296, PI. XIV, 

 figs. 28-30. Neugeroren, 1872, Arch. Ver. Siebenbiirg. Landeskunde 

 N. F. X (2), p. 276, PI. I, figs. 3 and 4. Hantken, 1875 (1876), Magyar 

 kir. foklt. int. ^vkonyve, Vol. IV, p. 45, PI. V, figs. 5 and 6; and Mitth. 

 a. d. Jahrb. k. ungar. geol. Anstalt, IV; 1875 (1881), p. 53, PI. I, figs. 3 

 and 4. Jones, 1876, M. Micr. Journ., Vol. XV, PI. 128, figs. 9«, /^ and 

 20rt', b; 21a, b. 



Some very fine examples of the above w^ere found; they 

 are especially characterized by the well developed final 

 chamber. This Tertiary species closely approaches the 

 Cretaceous C. triangularis of the same author, if indeed it 

 can be considered a distinct species. 



Santa Clara County, California; common. 

 Cristellaria gibba d'Orbigny. 



Plate XXX, Fig. 3. 



Cristellaria gibba d'Orbigny, 1839, Foram. Cuba, p. 63, PI. VII, figs. 20, 21. 

 Brady, 1884, Chall. Rept., Vol. IX, pp. 546, 547, PI. LXIX, figs. 8, 9. 



The specimen here figured is of somewhat irregular 

 growth but without doubt belongs to the above species. Its 

 range in geological time dates from the Cretaceous or even 

 earlier. 



Santa Clara County, California; one specimen. 

 Cristellaria rotulata (Lamarck). 



Plate XXX, Fig. 4. 



Lenticulites rotulata Lamarck, 1804, Annates du Museum, Tome V, p. 188, 

 No. 3.— Tabl. Encycl. et M^hod, PL CCCCLXVI, fig. 5. 



Cristellaria rotulata Parker & Jones, 1S65, Phil. Trans., Vol. CLV, p. 

 345, PI. XIII, fig. 19. Brady, 1884, Chall. Rept., Vol. IX, pp. 547, 548, 

 PI. LXIX, figs. 13a, b. 



The specimens under notice are somewhat strongly sep- 

 tate, otherwise they are typical of the species. 



