GENUS GLOBIGERINA D ORBIGNY 



Globigerina bilobata d'Orbigny 



14 Thin section, x 174. (Slide i) 



15 Entire specimen, x 175. (After Bagg, U. S. G. S. Bui. 268, 



1905, pi. 7, fig. 8) 



Globigerina bulloides d'Orbigny 



16 Thin section, x 174. (Slide i) 



17 Entire specimen, x 50. (After Brady, Chal. Rep't, v. 9, 1884, 



pl- 19, fig- to) 



Globigerina cambrica Matthew 



18 Thin section, x 58. (Slide i) 



19 Entire specimens, x 10. a, with initial chambers external; 



h, with initial chambers internal. (After Matthew, N. Y. 

 Acad. Sci., v. 14, 1895, pl. i, figs. 5a, h) 



Globigerina didyma Matthew 



20 Thin section, x 58. (Slide i) 



21 Entire specimen, x 10. a, front view showing orifice; h, side 



view. (Ref. cit., pl. i, figs. 7a, h) 



200 



