GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 61 



from bottom just below lower clay, Gatun section, relocated line 

 Panama Railroad; No. 6035, in gray green, fine-grained, sandy shell 

 marl, vicinity of Mindi Hill; and No. 6036 in dark-colored, fine- 

 grained, sandy clay marl of Monkey Hill, Mount Hope Station. 



CRISTELLARIA ITALICA (Def ranee). 



Saracenaria italica Deerance, Diet. Sci. Nat., vol. 32, 1824, p. 177 ; vol. 47, 



1827, p. 344 ; Atlas Conch., pi. 13, fig. 6. 

 Cristellaria (Saracenaria) italica d'Orbigny. Ann. Sci. Nat., vol. 7, 1826, 



p. 293, No. 26 ; Modules, Nos. 19 and 85. 

 Cristellaria italica Parker, Jones, and H. B. Brady, Ann. Mag. Nat. Hist., 



ser. 3, vol. 16, 1865, pp. 21. 32, pi. 1, figs. 41, 42.— H. B. Brady, Rep. 



Voy. Challenger, Zoology, vol. 9, 18S4, p. 544, pi. 68, figs. 17, 18, 20-23. 



Description. — Test with the early portion close coiled, later por- 

 tion more or less uncoiled, chambers numerous, those of the last- 

 formed portion being triangular in cross section, periphery keeled, 

 and the apertural face broad and flattened, the sides angled and ex- 

 tending on either side to the keel in flat faces, sutures but slightly 

 depressed, wall smooth ; apertures peripheral, radiate, usually with no 

 neck. 



Diameter 0.75 mm. Cat. No. 324632, U.S.N.M. 



Two specimens are evidently of this species in a young stage ; the 

 uncoiling not yet having proceeded to a great degree. They are from 

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

 sandy clay marl from Monkey Hill, Mount Hope Station. 



CRISTELLARIA PROTUBERANS, new species. 



Plate 22, fig. 2. 



Description. — -Test compressed, close coiled, biconvex, seven cham- 

 bers in each coil, each much inflated in its central portion, space be- 

 tween much compressed, flattened, periphery sharply and broadly 

 keeled; aperture peripheral, radiate. 



Diameter 0.80-1.20 mm. 



Three specimens of this species occurred at U.S.G.S. No. 6010, 

 lower part of Culebra formation, in dark clay north of Pedro Miguel 

 Locks. It is in some respects similar to species found in the Western 

 Pacific, especially in comparatively deep water off the Philippines. 



Type-specimen.— €at. No. 324633, U.S.N.M. 



CRISTELLARIA VAUGHANI, new species. 



Plate 22, fig. 3. 



Description. — Test much compressed, with a slight tendency to un- 

 coiling in the last-formed chambers, periphery slightly keeled, not 

 lobulated, rounded, about nine chambers in the last-formed whorl. 



