GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 59 



Genus NODOSARIA Lamarck, 1812. 



NODOSARIA COMMUNIS d'Orbigny. 



Plate 21, fig. 8. 



Nodosaria (Dentalina) communis d'Orbigny, Ann. Sci. Nat., vol. 7, 1S26, 



p. 254, No. 35. 

 Nodosaria communis Reuss, Verst. Bohm. Kreid., pt. 1, 1845. p. 28, pi. 12, 



fig. 21.— H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9. 1884, p. 504, 



pi. 62, figs. 19-22. 



Description. — Test elongated, slender, gradually tapering, slightly 

 curved, chambers slightly inflated in the middle, sutures distinct, 

 slightly depressed, somewhat oblique ; wall smooth. 



Length 2 mm. ? Cat. No. 324627. 



A single fragment showing four chambers was obtained in material 

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

 grained, sandy clay marl at Monkey Hill, Mount Hope Station. The 

 fragment with its general characters, its smooth surface, slightly 

 inflated chambers and oblique sutures seem to clearly indicate this 

 species. 



NODOSARIA INSECTA Schwager? 



Plate 21, fig. 9. 



Nodosaria insecta Schwager, Norara Exped. Geol. Thiel., pt. 2, 1866, p. 224, 

 pi. 5, figs. 52, 58. 



Description. — Test elongate, gradually tapering from the nearly 

 acute slender base to a broad apical end, which is the greatest in 

 diameter of any of the chambers of the test; chambers numerous, 

 inflated, nearly spherical, sutures much depressed; wall smooth, 

 apertures with a slight neck and circular opening. 



Length 2.3 mm. Cat. No. 324628a, b, U.S.N.M. 



Specimens were found in the lower part of Culebra formation both 

 at U.S.G.S. No. 6010, in dark clay, north of Pedro Miguel Locks, 

 and 6012<z, from lower dark clay beneath lower conglomerate, one- 

 fourth mile south of Empire Bridge. 



The specimens are very close to the species described by Schwager 

 from the Tertiary of Kar Nicobar. The two forms, megalospheric 

 and microspheric. occur in the Panamanian material, the latter being 

 much more slender at the initial end than in the megalospheric. 



NODOSARIA RAPHANISTRUM (Linnaeus). 



Plate 21, fig. 10. 



Nautilus raphanistrum Linnaeus, Syst. Nat., ed. 10, 1758, p. 710. 

 Nodosaria raphanistrum Reuss, in Geinitz, Grunclr. Verstein, 1845—46, p. 



653, pi. 24, fig. 6. — Jones. Parker, and H. B. Brady. Monogr. Pal. Soc, 



vol. 19, 1866, p. 50, pi. 1, figs. 6-8. 

 8370°— 18— Bull. 103 5 



