60 BULLETIN 103, UNITED STATES NATIONAL MUSEUM. 



Description. — Test elongate, subcylindrical, slightly tapering, 

 chambers numerous, distinct, apertural end with a short tapering 

 neck; wall ornamented with longitudinal costae continued clear to 

 the aperture, about 12-15 in number. 



Length 4 mm. Cat. No. 324629, U.S.N.M. 



A single specimen of this species figured here was obtained froir 

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

 clay, north of Pedro Miguel Locks. The specimen is not complete 

 at the initial end but the last six chambers including the aperture 

 are very well preserved. 



NODOSARIA, species? 



Plate 21, fig. 11. 



A fragment consisting of one complete chamber and the adjacent 

 parts of two others was found in the same material, U.S.G.S. No. 

 6010, as the above but nearly twice the diameter. The costae are 

 also more numerous. Without further material it is unsafe to try 

 to determine the fragment, but the occurrence of another species at 

 this station should be at least recorded. Cat. No. 624630, U.S.N.M. 



Genus CRISTELLARIA Lamarck, 1812. 



CRISTELLARIA ROT UL ATA (Lamarck). 



Plate 22. fig. 1. 



" Cornu Haminonis seu Nautili " Planctjs, Conch. Min., 1739, p. 13. pi. 1, 



fig. III. 

 Lentieulites rotula.ta Lamarck, Ann. Mus., vol. 5, 1804, p. 188, No. 3 ; vol. 8, 



1806, pi. 62. fig. 11. 

 Cristellaria rotulata d'Orbigny, Mem. Soc. Geol. France, ser. 1, vol. 4, 1840, 



p. 26, pi. 2, figs. 16-18. — H. B. Brady, Rep. Voy. Challenger, Zoology, 



vol. 9, 1884, p. 547, pi. 69, figs. 13a, b. 



Description. — Test comparatively large, biconvex, close coiled 

 throughout, chambers variable in number in the coil, sutures distinct, 

 periphery not lobulated, usually not keeled; previous apertures of 

 the test usually visible as is often the preceding coil at least in part ; 

 wall smooth. 



Diameter up to 2 mm. Cat. Nos. 324631a, b, c, d, e, U.S.N.M. 



This seems to be the commonest species in the Panamanian material. 

 It differs slightly in form in the various stations but all may be 

 grouped under this species. It occurred in two groups of stations 

 as noted in the chart of distribution. They are as follows: Lower 

 part of the Culebra formation at U.S.G.S. No. 6010, in dark clay, 

 north of Pedro Miguel Locks ; No. 6012a, in lower dark clay beneath 

 lower conglomerate, one-fourth mile south of Empire Bridge. 

 Gatun formation at U.S.G.S. No. 6033c, in marl from second bed 



