232 CRETACEOUS PALEONTOLOGY. 



Geographic distribution. New Jersey. 



Rhabdogonium tricarinatum (d'Orbigny). 

 Plate II., Figs. 31-32. 



1826. Vaginulina tricarinata d'Orbigny, Ann. Sci. Nat., voL 

 vii, p. 258, No. 4; Modele, No. 4. 



1861. Rhabdogonium pyramidale Karrer, Sitz. Akad. Wiss, 



Wien, vol. xvi, p. 19, pi. i, fig. 34. 

 1884. Rhabdogonium tricarinatum Brady, Chal. Kept., vol. ix r 



p. 525, pi. Ixvii, figs. 1-3. 

 1898. Rlwbdogonium\ tricarinatum Bagg, Bull. U. S. G. $., No. 



88, p. 51. 



Description. "Test triangular, elongated and gradually taper- 

 ing toward both extremities ; peripheral margins sharp, becoming 

 slightly twisted below; anterior end prolonged into a tube-like 

 neck; chambers about 10, narrow, arched, and separated by 

 curved septa; aperture rotund. 



"Length,. 2. 6 mm." (Bagg.) 



Formation and locality. Vincentown limesand, Brownsville 

 (Bagg). 



Geographic distribution. New Jersey. 



Rhabdogonium tricarinatum var. acutangulum Reuss. 



1862. RJwbdogoniuni\ tricarinatum var. acutangulum Reuss,. 



Sitz. Akad. Wiss. Wien, vol. xlvi, Abth. i, p. 55, pi. iv, 

 fig. 14, a, b. 



1898. Rhabdogonium tricarinatum var. acutangulum Bagg, 

 Bull. U. S. G. S., No. 88, p. 51. 



Description. "Test small, trihedral, coarsely arenaceous; the 

 three marginal angles sharp and distinct; chambers few, short, 

 separated by somewhat arched septa, not very distinct externally ; 

 primordial end sharp, anterior obtusely angular; aperture tri- 

 angular; with incurved lateral edges. 



"Length, 1.73 mm." (Bagg.) 



Formation and locality. Marshalltown clay-marl, Marshall- 

 town (Bagg). 



Geographic distribution. New Jersey. 



