244 CRETACEOUS PALEONTOLOGY. 



1898. Cristellaria rotulata Bagg, Bull. Am. Pal., vol. 2, No. 10, 



p. 27 (321). 

 1901. Cristellaria rotulata Bagg, Md. Geol. Surv., Eocene, p. 



242, pi. 63, fig. 5. 

 1905. Cristellaria rotulata Bagg, Bull. U. S. G. S., No. 268, p. 



37> PL 5, fig- 7- 



Description. "Test involute, biconvex, smooth ; peripheral 

 edge sharp, noncarinate; chambers numerous, but only eight or 

 nine in final volution ; septa moderately curved, visible externally 

 as fine lines; aperture elliptical, radiate. 



"Diameter, 1-2 mm." (Bagg.) 



Remarks. "This is one of the most common forms in the 

 limesand bed, and is especially plentiful at Vincentown. The size 

 of the shell is very variable, some of the largest specimens being 

 more than 2 millimeters in diameter." (Bagg.) 



Formation and locality. Hornerstown marl, Blue Ball 

 (Bagg) ; Vincentown limesand, Vincentown, Mullica Hill, New 

 Egypt, Timber Creek (Bagg) ; Manasquan marl, Vincentown 

 (Bagg). 



Geographic distribution. New Jersey; Eocene of Maryland, 



Miocene of California. 







Cristellaria secans Reuss. 



1859. Cristellaria secans Reuss, Sitz. Akad. Wiss. Wien, vol. 



xl, p. 214, pi. ix, fig. 7. 

 1898. Cristellaria secans Bagg, Bull. U. S. G. S., No. 88, p. 58. 



Description. "Test circular, laterally compressed, sharply 

 keeled on the peripheral margin ; umbilical disc prominent and 

 septa radiating from this in gently curving lines; about 10 small 

 triangular chambers in the last convolution. 



"Diameter, 1.5 mm." (Bagg.) 



Formation and locality. Navesink marl, Freehold (Bagg). 



Geographic distribution. New Jersey. 



Cristellaria trachyomphala (Reuss). 



1850. Robulina trachyomphala Reuss, Haidinger's Nat. Ab- 

 handl., vol. iv, pt. i, p. 34, pi. iii (error for ii), fig. 12. 



