66 BULLETIN 103, UNITED STATES NATIONAL MUSEUM. 



yards south of southern end of switch at Bohio Ridge Station, re- 

 located line, Panama Eailroad. Gatun formation, U.S.G.S. No. 

 6033c, in marl from second bed from bottom, just below lower clay, 

 Gatun Section, relocated line, Panama Railroad ; 6035, in gray green, 

 fine grained, sandy shell marl near Mindi Hill and 6036 in dark 

 colored, fine grained, sandy clay marl, Monkey Hill, Mount Hope 

 Station. 



As in the case of the preceding species the specimens from the 

 last three stations were very finely preserved while those of the 

 others were glauconitic. 



GLOBIGERINA CONGLOBATA H. B. Brady. 



Globigerina conglobata H. B. Beady, Quart. Journ. Micr. Sci., vol. 19, 1879, 

 p. 72; Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 603, pi. 80, figs. 

 1-5 ; pi. 82, fig. 5. 



Description. — Test subglobular, early chambers arranged in a com- 

 pact spiral, the last three chambers in the complete adult test form- 

 ing nearly the whole of the visible portion of the test, wall coarsely 

 reticulate; main aperture at the inner margin of the chamber with 

 several rounded secondary apertures along the margins of the 

 chamber where it is attached to adjacent ones. 



Diameter up to 1 mm. Cat. Nos. 324655-6. 



Specimens of G. conglobata were found in small numbers in the 

 Gatun formation at stations 6035 and 6036. They were typical but 

 perhaps hardly as well developed as in some Recent material. Its 

 occurrence here is rather interesting as it is almost unknown in the 

 fossil condition. 



GLOBIGERINA SACCULIFERA H. B. Brady. 



Globigerina helicina Carpenter (not G. helicina d'Orbigny). Intr. Foraiu., 

 1862, pi. 12, fig. 11. 



Globigerina sacculifera H. B. Brady, Geol. Mag., Dec. 2. vol. 4, 1877, p. 

 535 ; Quart. Journ. Micr. Sci., vol. 19, 1879, p. 73 ; Rep. Voy. Challenger, 

 Zoology, vol. 9, 1884, p. 604, pi. 80, figs. 11-17 ; pi. 82, fig. 4. 



Description. — Test composed of numerous chambers, in its early 

 stages very similar to G. bulloicles but later developing a more oblong 

 form, the chambers extended, somewhat compressed and with ac- 

 cessory apertural openings, the final chamber often flattened and 

 irregularly formed toward the outer end; wall strongly reticulated 

 in all but the final chamber which is much smoother than the others ; 

 aperture large, arched, with other accessory openings in the chambers 

 of adult specimens. 



Diameter up to 1 mm. Cat. Nos. 324657-8, U.S.N.M. 



