CBETACEOUS FLORA. 31 



Spiroplecta, Gaudryina.] 



Shell cuneiform, Ungulate, convex, punctate, anteriorly dilate, truncate, pos- 

 teriorly obtuse acuminate, laterally carinate, acute, lamelloae, foramina narrow, 



oblique, arcuate, marginate. 



Locality. Saline county, Nebraska. 







SPIROPLECTA, Ehrenberg. 

 SPIROPLECTA A ERIC ANA Ehrenberg. 



PLATE C, FIGS. 12, 13, 14. 



Spiroplecta americana EHREN., 1854. Mikrogeolgie, pi. xxxii, I, flgs. 13, 14; II, flg 25. 



Spiroplecta ammcana BRADY, 1884. Report on Foram. H. M. S. Challenger, Zool., vol. ix, p. 376, pi. 



xlv, flg. 24 a, b. 

 Spiroplecta americana WOODWARD and THOMAS, 1885. Thirteenth Annual Beport, Geol. Nat. Hist. 



Survey Minn., p. 168, pi. iii, flg. 9. 



''The test is usually much compressed, and widens rapidly towards the distal 

 end ; the lateral edges are thin and slightly lobulated, the chambers somewhat 

 inflated, and the septal lines correspondingly depressed on the exterior; the walls 

 are thin and smooth." BRADY, loc. cit. 



Locality. Meeker county, Minn.; Saline county, Neb.; South Chicago, 111. This species does not 

 seem to be very widely distributed; only two specimens found, one in Minnesota, and the other in 

 Nebraska. The specimens figured by Ehrenberg were from the Cretaceous beds of Missouri and Mis- 

 sissippi.* We believe that in the fossil state it has only been found in North America. 



* 



GAUDRYINA, d'Orbigny. 

 GAUDRYINA PUPOIDES d'Orbigny. 



PLATE C, FIGS. 15, 16. 



Gaudryina pupoides d'ORBiGNY, 1840. Mem. Soc. Geol. France, vol. iv, p. 44, pi. iv, flgs. 22-24 

 Gaudryina pupoides Id., 1846. Foram. Foss. Vien., p. 197, pi. xxi, flgs. 34-36. 



Gaudryina subylabra GUMBEL, 1868. Abh. d. k. bayer. Akad. Wiss., II, cl., vol. x, p. 602, pi. i, flg. 4. 

 Gaudryina pupoides BRADY, 1884. Beport on Foram. H. M. S. Challenger, Zool., vol ix, p. 378, pi. 



xlvi, flgs. 1-4. 

 (raudryina pupoides WOODWARD and THOMAS, 1885. Thirteenth Annual Report, Geol. Nat. Hist. 



Surv. Minn., p. 168, pi. iii, flg. 10. 



" Guadryina pupoides is an easily recognized species. Its dimorphous mode of 

 growth is generally very apparent, and its variability is limited to such features as 

 the number of segments, the relative length and breadth of the test, and the degree 

 of lateral compression. In recent shells the walls are thin and calcareous, smooth 

 externally, and almost invariably of a greyish hue ; fossil specimens sometimes 

 exhibit a slightly rough exterior. In form and position the aperture resembles that 

 of the typical Textulrtrice, but it is often surrounded by a raised lip or border." 

 BRADY, loc. cit. 



Locality. Meeker county and Little Fork river, near Rainy lake, Minnesota, and Saline county, 

 Nebraska. Moderately abundant in these localities. 



Brady. Report on the Forumtnlfera, H. M. S. Challenger, p. 376. 



