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. 



1 861. Rhahdogonium pyramidale Karrer, Sitz. Akad. Wiss. 



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

 1884. Rhahdogonkinu tricarinatum Brady, Chal. Rept., vol. ix, 



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

 i8g8. Rhabdogoniunn tricarinatum Bagg, Bull. U. S. G. S., 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.) 



Pormation and locality. — Vincentown limesand, Brownsville 

 (Bagg). 



'Geographic distribution. — New Jersey. 



Rhabdogonium tricarinatum var. acutangulum Reuss. 



1862. Rhabdogoniunn tricarinatiiiii 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 distribiUion. — New Jersey. 



