236 CRETACEOUS PALEONTOLOGY. 



result of this constriction of the chambers at the curved margin, 

 transverse sections show only four or five chambers. Along the 

 straight edge run three elevated, rounded costse, virith sometimes- 

 one or two smaller ones between. The latter, however, do not 

 extend the whole length of the shell as do the ridges. Septal 

 lines distinct, slightly crenate, becoming much thickened toward 

 the straight edge of the shell ; primordial chamber oval, elevated, 

 slightly mucronate, covered by numerous costse. 



"Length, 3-9 mm.; breadth, 2.3 mm." (Bagg.) 



Remarks. — "This species is very common in the lower marl 

 of Ereehold, but I have not found it elsewhere." (Bagg.) 



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



Geographic distribution. — New Jersey. 



Cristellaria Lamarck. 



Cristellaria acutauricularis (FicMel and Moll). 



Plate II., Figs. 3S-36. 



1803. Nautilus acutauricuiaris Fichtel and Moll, Test. Micros.,. 



p. 102, pi. xviii; figs. g-i. 

 1840. Cristellaria namcula d'Orbigny, Mem. Soc. geol. France, 



vol. iv, ser. i, p. 27, pi. ii, figs. 19, 20. 

 1884. Cristellaria acutauricidairis Brady, Chal. Rept., vol. ix, p. 



543, pi. cxiv, fig. 17 a, h. 

 1898. Cristellaria acutauricuJaris Bagg, Bull. U. S. G. S., No. 



88, p. 54. 



Description. — ^"Test involute, thick, convex, smooth; septal 

 plane broad, triangular, nearly flat; chambers seven or eight, 

 weakly curved ; keel acute carinate ; aperture nipple-shaped, situ- 

 ated at the extremity of the convex side. 



"Length, 1.43 mm.; breadth, 0.65 mm." (Bagg.) 



Pormation and locality. — Vincentown limesand, Vincentown, 

 Timber Creek (Bagg). 



Geographic distribution. — New Jersey. 



