GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 57 



rounded in transverse section; wall coarsely arenaceous, chambers 

 comparatively few, sutures indistinct, aperture a narrow slit at the 

 base of the inner margin of the last formed chamber. 



Length 1.7 mm., breadth 1.0 mm. Cat. No. 324622, U.S.N.M. 



A single specimen which seems to belong to this species was found 

 in material from U.S.G.S. No. 6010, lower part of the Culebra forma- 

 tion, in dark clay, north of Pedro Miguel Locks. The specimen, like 

 many others from this station, is glauconitic and not well preserved 

 in all its details. 



Genus CLAVULINA d'Orbigny, 1826. 



CLAVULINA PARISIENSIS d'Orbigny. 



Plate 20, fig. 5. 



Clavulina parisiensis d'Orbigny, Ann. Sci. Nat., vol. 7, 1826.. p. 268. — H. B. 

 Brady, Rep. Voy. Challenger, Zoology, vol. 9, 18S4, p. 395, pi. 48, figs. 

 14-18. 



Description. — Test elongate, subcylindrical, early portion conical, 

 later portion gradually increasing in diameter toward the apertural 

 end, chambers comparatively few, those of the uniserial portion cir- 

 cular in cross section, wall coarsely arenaceous, somewhat rough; 

 aperture circular, terminal. 



Length nearly 2 mm., diameter 0.7 mm. Cat. No. 324623, U.S.N.M. 



A single specimen representing this species was obtained in mate- 

 rial from U.S.G.S. No. 6010, lower part of the Culebra formation, 

 in dark clay north of Pedro Miguel Locks. Both this and the fol- 

 lowing are common Tertiary species. 



CLAVULINA COMMUNIS d'Orbigny. 



Plate 20, fig. 6. 



Clavulina communis d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 268 ; Foram. 

 Foss. Bass. Tert. Vienne, 1846, p. 196, pi. 12, figs. 1, 2. 



D escrijition. — Test very elongate, subcylindrical, circular in trans- 

 verse section, early portion triserial, later portion uniserial, of rather 

 uniform diameter, sutures more or less indistinct, wall smooth ; aper- 

 ture terminal. 



Length 2 mm., breadth 0.45 mm. Cat. No. 324624, U.S.N.M. 



A single specimen of this species occurred with the preceding, 

 U.S.G.S. No. 6010, in the lower part of the Culebra formation. It 

 is fragmentary but probably represents this species. 



