﻿GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 67 



Specimens were not uncommon in material from the Gatun forma- 

 tion at stations 6035 and 6036. As in the case of G. conglobata the 

 specimens were hardly as well developed as they are in recent speci- 

 mens, but nevertheless had the characteristic marks of the species. 

 As in G. conglobata the records of this species are almost entirely 

 limited to Recent material, its occurrence as a fossil being practically 

 unknown. 



GLOBIGERINA AEQUILATERALIS H. B. Brady. 



Cas-vrJulina glohnlo^a (part) EfiOKE. Xeuos .Tahrb. fiir Min., 1857. p. 296, 



pL 11. fig. 4. 

 Globigerina aequilnteralis H. B. Brady. Quart. .Touru. Micr. Sci., vol. 19. 



1S79, p. 71 : Kep. Voy. Cha1lenf/er, Zoologry, vol. 9, 1884, p. 605, pi. 80, 



figs. 18-21. 



Description. — Test composed of numerous inflated chambers, ar- 

 ranged in a planospiral manner, at least the last formed coil, cham- 

 bers increasing rapidly in size as added, usually 5 to 6 in the last 

 formed volution; sutures depressed, periphery lobulated; surface 

 reticulate; aperture large, at the base of the inner margin of the 

 <?hamber. 



Diameter up to 1 mm. Cat. Nos. 324659-61, U.S.N.M. 



In the material from the Gatun formation at three stations, Nos. 

 6033<7, 6035, 6036, this species was not uncommon. The only char- 

 acter in which there seems to be a difference from the Recent material 

 is in the early chambers which occasionally show at one side as a flat 

 spiral while the later chambers are bilateral. The species is not a 

 common one as a fossil. 



Genus ORBULINA d'Orbigny, 1839. 



ORBULINA UNIVERSA d'Orbigny. 



OrbuUna univcrsa d'Oebtgny, in De la Sagra, Hist. Fi.s. Pol. Nat. Cuba, 

 1839, Foraminif&res, p. 3, pi. 1, fig. 3.— H. B. Brady, Rep. Voy. Chal- 



lenr/er, Zoology, vol. 9, 1884, p. HOS. i)l. 78: pi. 81. figs. 8-26; pi. 82, 

 figs. 1-3. 



Description. — Test in adult form typically consisting of a single, 

 spherical visible chamber, which may or may not have contained 

 within the early Globigerine stages: wall strongly reticulate, a single 

 large circular aperture and smaller openings at the base of each 

 reticulation. 



Diameter up to 1 mm. Cat. Nos. 324662-3, U.S.N.M. 



Specimens were not uncommon in the Gatun formation at the 

 three stations, Nos. 6033c, 6035, and 6036. Occasional specimens 

 show the double form as figured by Brady. The specimens other- 

 wise are like the common run of Recent material. 



