CRETACEOUS FORAMINIFERA. 41 



Globlgerlna.l 



" Test spiral, subtrochoid ; superior face convex, inferior more or less convex 

 but with deeply sunken umbilicus, periphery rounded, lobulated ; adult specimens 

 composed of about seven globose segments, of which four form the outer convolu- 

 tion ; the apertures of the individual chambers opening independently into the 

 umbilical vestibule. Diameter sometimes Vth inch (0.63 mm.) but oftener much 

 less." BRADY loc. cit. 



Locality. Meeker county, Minnesota ; Saline county, Nebraska ; South Chicago, Illinois. Common 

 in Nebraska ; not quite so common in Minnesota; rare in South Chicago. The most common of all our 

 living forms, and may be found anywhere along our seacoast, also as a fossil in the " Eolian sand " from 

 the Smoky Hill river, near Lindsborg, Kansas. 



GLOBIGERINA CRETACEA d'Orbigny. 



PLATE D, FIGS. 18. 19. 



Globigerina cretacea d'OiiBiGNY, 1840. Mem. Soc. Geol. France, vol. iv, p. 34, pi. iii, flgs. 12-14. 



Globigerina faveolota (pars) EHRENBERG, 1854. Mikrogeologie, pi. xxiv, flg. 49. 



Olobigerina libani EHHENBERG, Ibid., pi. xxv, flg. 30. 



Planulina pachyderma, Id., Ibid., pi. xxv, flg. 31. 



Botalia pertusa, Id., Ibid., pi. xxiv, flg. 41. 



Botalia aspera, Id., Ibid., pi. xxvii, flgs. 57, 58; pi. xxviii, flg. 42; pi. xxxi, flg. 44. 



Botalia globulosa, Id., Ibid., pi. xxvii, flg. 60: pi. xxviii, flgs. 40, 41 ; pi. xxxi, flgs. 40, 41, 43. 



Botalia densa, Id., Ibid., pi. xxvii, flg. 62. 



Rotalia quaterna, Id., Ibid., pi. xxvii, flg. 53; pi. xxviii, flg. 34. 



Botalia rosa, Id., Ibid., pi. xxvii, flg. 54. 



Botalia pachyomphala, Id.. Ibid., pi. xxvii, flg. 55. 



Botalia tracheotetras, Id., Ibid., pi. xxvii, flg. 35. 



Botalia per 'forata, Id., Ibid., pi. xxviii, flg. 36 ; pi. xxix, flg. 2. 



Botalia protacmcea, Id., Ibid., pi. xxviii, flg. 37. 



Rotalia laxa, Id., Ibid., pi. xxviii, flg. 38 ; pi. xxix, flg. 1 ; pi. xxxi, flg. 42. 



Botalia centralis, Id., Ibid., pi. xxviii. flg. 39. 



Olobigerina cretacea BRADY, 1879. Quart. Journ. Micr. Soc., vol. xix, n. s., p. 285. 



Olobigerina cretacea BRADY, 1884. Report on Foram. H. M. S. Challenger, Zool., vol. ix, p. 596, pi. Ixxxii, 



fossil specimens, flg. 11, a-c. 

 Globigerina cretacea WODWARD and THOMAS, 1885. Thirteenth Annual Report, Geol. Nat. Hist. 



Surv. Minn., p. 171, pi. iii, flgs. 14-16; iv, flg. 19. 



" Test rotaliform, much compressed ; superior face flattened or only slightly 

 convex, inferior side depressed towards the centre and excavated at the umbilicus, 

 periphery obtuse and lobulated ; composed of about three tolerably distinct convolu- 

 tions, the outermost consisting of from five to seven segments ; segments relatively 

 small, subglobular ; apertures opening into an umbilical vestibule. Diameter^Vth 

 inch (0.5 mm.)" BRADY loc. cit. 



Locality. Meeker county, Minnesota ; Saline county, Nebraska ; South Chicago, Illinois, and Little 

 Fork river, near Rainy lake, Minnesota. It is found very abundant in the Boulder clay of Minnesota, but 

 the specimens are quite fragmentary, while those in the Nebraska and Illinois clays are more numerous 

 and in a much better state of preservation. Dr. G-. M. Dawson, in 1874, found it in the Cretaceous clays 

 from Manitoba. 



