56 BULLETIN 103, UNITED STATES NATIONAL MUSEUM. 



Genus BIGENERINA d'Orbigny, 1826. 



BIGENERINA NODOSARIA d'Orbigny. 



Plat* 21, fig. 5. 

 Bigenerina nodosaria d'Oebigny, Ann. Sci. Nat., vol. 7, 1826, p. 261, pi. 

 11, figs. 9-11. — H. B. Beady, Rep. Voy. Challenger, Zoology, vol. 9, 

 1884, p. 369, pi. 44, figs. 14-18. 



Description. — Test elongate, subcylindrical, early portion consist- 

 ing of a few chambers arranged as in Textularia, later ones uniserial, 

 early portion tapering abruptly toward the apical end, wall coarsely 

 arenaceous, sutures rather indistinct, aperture circular and central. 



Length 2 mm., breadth 0.8 mm. Cat. No. 324620, U.S.N.M. 



Several specimens in excellent condition were obtained from 

 U.S.G.S. No. 6036, Gatun formation, in dark-colored, fine-grained, 

 sandy clay marl from Monkey Hill, Mount Hope Station. 



These specimens, as in the one figured, have but a slight indication 

 of the biserial chambers from the exterior, but otherwise seem to be 

 typical. At first glance they might be taken for a species of 

 Glavulina. 



Genus GAUDRYIMA d'Orbigny, 1839. 



GAUDRYINA FLINTII Cushman. 



Plate 20, fig. 4. 

 Gaudryina subrotundata Flint (not G. subrotundata Schwager, 1866), 



Ann. Rep. U. S. Nat. Mus., 1897 (1899), p. 287, pi. 33, fig. 1. 

 Gaudryina flintii Cushman, Bull. 71, U. S. Nat. Mus., pt. 2, 1911, p. 63, 



fig. 102a-c. 



Description. — Test subconical, early portion rounded conical, trise- 

 rial, later portion subcylindrical, biserial chambers of later portion 

 nearly semicircular in transverse section, sutures distinct; wall are- 

 naceous ; aperture subcircular, at the base of the inner margin of the 

 chamber. 



Length 1.20 mm., breadth 0.72 mm. Cat. No. 324621. 



A single specimen which seems to be close to recent specimens of 

 this species was obtained from U.S.G.S. No. 6010, lower part of the 

 Culebra formation, in dark clay, north of Pedro Miguel Locks. The 

 specimen is somewhat glauconitic and certain of the details are more 

 or less obscured. 



GAUDRYINA TRIANGULARIS Cushman. 



Plate 20, fig. 3. 



Gaudryina triangularis Cushman, Bull. 71, U. S. Nat. Mus., pt. 2, 1911, 

 p. 65, figs. 104a-c. 



Description. — Test somewhat longer than broad, early portion tri- 

 angular, the faces somewhat concave, triserial ; later portion biserial, 



