42 THE PALEONTOLOGY OF MINNESOTA. 



IGlobigerlna. 



GrLOBIGERINA MARGINATA BeUSS. 

 PLATE D. FIGS. 20, 21. 



Rosalina marginata REUSS. 1845. Verstein. bohm. Kreid., pt. i, p. 36, pi. xiii, flg. 47. 



Bosalina marginata JONES, 1853. Ann. and Mag. Nat. Hist., ser. 2, vol. xii, p. 241, pi. ix, flg. 7. 



Eosalina marginata REUSS, 1854. Denkschr. d. k. Akad. Wiss. Wien, vol. vii, p. 69, pi, xxvi, flg. 1. 



Discorbina marginata, Id., 1854. Sitzungsb. d. k. Akad. Wiss. Wien, vol. vii, p. 12, No. 2. 



Olobigerina marginata PARKER and JONES, 1865. Phil. Trans., vol. civ, p. 367. 



Eotalia marginata GTJMBEL, 1870. Sitzungsb. d. k. bayer. Akad. Wiss., vol. ii, pp. 283, 287. 



Globigerina marginata KEUSS, 1874. Das Elbethalgebirge in Sachsen, 2*r Theil, p. 112, No. 2. 



Olobigerina 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, flg. 17. 

 Globigerina marginata WOODWARD and THOMAS, 1885. Thirteenth Annual Report, Geol. Nat. Hist. 



Surv. Minn., p. 174, pi. iv. flgs. 20-22. 



"Test rotaliforra, 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 ^th to -^ih 

 inch (0.5 to 1 ram.)" BRADY 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. linnceana, while in others PuMnvlina menardii; but we 

 feel quite satisfied to favor G. marginata REUSS. 



GLOBIGERINA SACCULIFERA H, B. Brady. 



PLATE D, FIG. 22. 



Globigerina lielicina CARPENTER, 1862. Introd. Foram., pi. xii, flg. 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, pi. 



Ixxx, flgs. 11-17; pi. Ixxxii, flg. 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 7 Vth inch (1 mm.) more or less." BRADY 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 satisfied that it 

 is the same species. 



