42 THE PALEONTOLOGY OF MINNESOTA. 
(Globigerina. 
GLOBIGERINA MARGINATA Jeuss. 
PLATE D, FIGS. 20, 21, 
Rosalina marginata Reuss, 1845. Verstein. bohm. Kreid., pt. i, p. 36, pl. xiii, fig. 47. 
Rosalina marginata JONES, 1853. Ann. and Mag. Nat. Hist., ser. 2, vol. xii, p. 241, pl. ix, fig. 7. 
Rosalina marginata Reuss, 1854. Denkschr. d. k. Akad. Wiss. Wien, vol. vii, p. 69, pl, xxvi, fig. 1. 
Discorbina marginata, Id., 1854. Sitzungsb. d. k. Akad. Wiss. Wien, vol. vii, p. 12, No. 2. 
Globigerina marginata PARKER and JONES, 1865. Phil. Trans., vol. cly, p. 367. 
Rotalia marginata GUMBEL, 1870. Sitzungsb. d. k. bayer, Akad. Wiss., vol. ii, pp. 283, 287. 
Globigerina marginata Reuss, 1874. Das Elbethalgebirge in Sachsen, 2ter Theil, p. 112, No. 2. 
Globigerina marginata BRADY, 1879. Quart. Journ. Micr. Soc., vol. xix, n. s., p. 74. 
Globigerina marginata BRADY, 1884. Report on Foram. H. M.S. Challenger, Zool., vol. ix, p. 597, 
wood cut, fig. 17. 
Globigerina marginata WOODWARD and THomAs, 1885. Thirteenth Annual Report, Geol. Nat. Hist. 
Surv. Minn., p. 174, pl. iv. figs. 20-22. 
“Test rotaliform, much compressed ; superior face convex, inferior face also 
convex, but with a sunken umbilical recess, peripheral edge thin or subcarinate ; 
segments numerous, five or six in the last convolution, the outer margin of each seg- 
ment exhibiting a well-marked narrow border ; apertures opening into the umbilical 
vestibule. Surface of living specimens beset with spines. Diameter 2,th to th 
inch (0.5 to 1 mm.)” Brapy loc. cit. 
Locality. Meeker county and Northeastern Minnesota ; Little Fork river, Saline county, Nebraska ; 
South Chicago, Illinois. This species in Minnesota is quite well represented, and in good state of 
preservation, while in Nebraska they are common but fragmentary. We are in some doubt about this 
species, it resembles so closely in some respects G. linnceeana, while in others Pulvinulina menardii; but we 
feel quite satisfied to favor G. marginata REuss. 
GLOBIGERINA sAccuLirERA H, B. Brady. 
PLATE D, FIG. 22. 
Globigerina helicina CARPENTER, 1862. Introd. Foram., pl. xii, fig. 11. 
Globigerina sacculifera BRADY, 1877. Geol. Mag., dec. II, vol. iv, p. 535. 
Globigerina sacculifera BRADY, 1879. Quart. Journ. Micr. Soc., vol. xix, n. s., p. 73. 
Globigerina sacculifera BRADY, 1884. Report Foram. H. M.S. Challenger, Zool., vol. ix, p. 604, pl. 
; 1xxx, figs. 11-17; pl. Ixxxii, fig. 4. 
“Test oblong, compressed, rotaliform ; segments few, usually five to seven in 
number, of which four generally compose the final convolution ; earlier chambers 
small and subglobular ; the ultimate segment, and sometimes also the penultimate, 
elongated radially and more or less pointed at the peripheral extremity. Aperture 
variable, consisting of a single large opening at the inferior umbilical margin of the 
terminal segment, and one or sometimes several round orifices in the sutural 
depressions of the superior face. Pelagic specimens spinous externally. Longer 
diameter ,th inch (1 mm.) more or less.’ Brapy loc. cit. 
Locality. Northeastern Minnesota. We found but one specimen in the boulder clays, but it closely 
resembled, in so many respects, those figured by Carpenter and Brady, that we are quite satisfled that it 
is the same species. 
