FORAMINIFEEA OF THE ATLANTIC OCEAN. 99 



TRIFARINA, new genus. 



Rhabdogonium H. B. Brady (not lleuss), Rep. Voy. Challenge!; Zoology, 



vol. 9, 18S4, p. 524 (and subsequent authors). 

 Triplasia Cushman (not Beuss), Bull. 71, U. S. Nat. Mus., pt. 3, 1913, p. 62. 



DescHptio7i. — Test elongate, triangular in transverse section; the 

 early chambers in an irregular spiral, later ones very loosely so or 

 even uniserial; wall thin, translucent, finely punctate; aperture ter- 

 minal not radiate, at the end of a short, often phialine lip. 



The recent material which composes this genus has been referred 

 to a number of genera. THplasm of Reuss is based on Cretaceous 

 species which are three-sided and seem to belong rather to the Tex- 

 tulariidae, possibly to Trltaxia. His name later changed by him 

 to Rhahdogoniwn^ on account of the finding of species polygonal in 

 transverse section, is based on similar Cretaceous material. 



The Recent material is different from these. It is more nearly 

 allied to Uvigerina and Siphogenerina than to Nodosaria. The 

 early development is similar to that of Uvigenna and the aperture 

 is not of the radiate form seen in most of the Nodosaria group. A 

 new genus has been erected for this. The Pacific species which I 

 have called Triplasia reussi should be known as Trifarina reussi 

 Cushman. 



Type-species. — Trifarina hradyi Cushman, new species. 



TRIFARINA BRADYI, new species. 



Plate 22, figs. 3-9. 



Rhabdogonium tricarinatmn H. B. Brady (not Vaginulina tricarinata 

 d'Orbigny), Rep. Voy. Challenger, Zoology, vol. 9, 1884 p. 525, pi. 67, 

 figs. 1-3; Journ. Roy. Micr. Soc, 1887, p. 910.— H. B. Brady, Parker, 

 and JoNKs, Trans. Zool. Soc. London, vol. 12, 1888, p. 223, pi. 45, fig. 

 3.— Wright, Ann. Mag. Nat. Hist., vol. 4, ser. 6, 1889, p. 449; Proc. 

 Roy. Irish Acad., ser. 3, vol. 1, 1891, p. 484. — Bggeb, Abh. kon. bay. 

 Akad. Wiss. Miinchen, CI. II, vol. 18, 1893, p. 355, pi. 11, figs. 49, 50; 

 pi. 12, figs. 36-38. 



Description. — Test elongate, slightly tapering toward either end, 

 often somewhat twisted, triangular in transverse section, with carinae 

 at three angles, thin and fairly high, running from the initial end 

 to the aperture, even onto the neck itself; chambers distinct, those 

 of the earlier portion at least irregularly spiral, later ones less dis- 

 tinctly so; sutures distinct but not depressed; wall thin, translucent, 

 finely punctate, smooth; aperture terminal, central, at the end of a 

 short tubular neck, usually with a phialine lip. 



Length up to 0.50 mm. 



Distribution. — Type-specimen (U.S.N.M. Cat. No. 17443) from 

 Albatross station 1)2150, in 382 fathoms (697 meters), in the Carib- 



