SMALLER FORAMINIFERA FROM ILLINOIS 



349 



p. 619, pi. 1, fig. 32; Upper Eocene, Bavaria. — 

 Hankten, 1876, Magy. kir. faldt. int. Evkou- 

 yoe, vol. 4, p. 21, pi. 2, figs. 6a-d; Eocene, 

 Alabama. — Cushman, 1925, Cushman Lab. 

 Foram. Research Contr., vol. 1, p. 66, pi. 10, 

 fig. 7; Eocene, Alabama. — Cushman and 

 Hanna, 1927, San Diego Soc. Nat. Hist. Trans., 

 vol. 5, no. 4, p. 52, pi. 5, figs. 1-3; Lajolla 

 formation. Eocene, California. — Cushman, 

 1935, U. S. Geol. Survey Prof. Paper 181, p. 21; 

 Upper Eocene, U. S. Coastal Plain. — Cushman 

 and McMasters, 1936, Jour. Paleontology, vol. 

 10, p. 512, pi. 75, figs. 11, 12; Middle Eocene, 

 California. — Toulmin, 1941, Jour. Paleon- 

 tology, vol. 15, p. 588, pi. 79, figs. 26, 27; Salt 

 Mountain limestone. Eocene, Alabama. 



Nodosaria affinis Plummer, 1927, Texas Univ. 

 Bull. 2644, p. 89, pi. 14, figs. 2a-d; Midway 

 group, Paleocene, Texas. — Cushman, 1940, 

 Cushman Lab. Foram. Research Contr., vol. 

 16, p. 59, pi. 10, figs. 30-33; Midway group, 

 Paleocene, Alabama. 



Nodosaria burdensis Hankten, 1876, Magy. kir. 

 faldt. int. fivkouyoe, vol. 4, p. 23, pi. 2, fig. 10, 

 pi. 16, fig. 4. 



Nodosaria vertehralis Nuttall, 1932, Jour. Paleon- 

 tology, vol. 6, p. 15, pi. 3, fig. 9; Alazan shale. 

 Lower Oligocene, Tampico Embayment, Mex- 

 ico. 



Nodosaria sp. A, Israelsky, 1939, Sixth Pacific 

 Sci. Cong. Proc. vol. 2, p. 575, pi. 3, fig. 11; 

 Marysville formation, Eocene, California. 



Test straight; chambers broad, only 

 slightly inflated; with 9 strong longitudinal 

 costate which continue across sutures and 

 are normal to surface of chamber; sutures 

 transverse; diameter 1.2 mm.; length (2 

 chambers), 2.0 mm. 



This very strongly ribbed form seems 

 quite variable in its specific characters. The 

 fragmentary specimen figures represents one 

 of the largest assigned to this species al- 

 though it has the minimum number of 



costae. It is very common in Eocene sedi- 

 ments, especially in the lower formations. 

 While quite similar to the Cretaceous N. 

 zippei Reuss it differs from N. affinis Reuss, 

 which has according to the original descrip- 

 tion only 4 to 5 costae. 



NoDOSAEiA SPINOCOSTATA Cooper, n. sp. 

 Plate 54, figure 11 



Nodosaria spinulosa Plummer (part), 1927, Texas 

 Univ. Bull. 2644, p. 84, pi. 4, fig. 19c only; 

 Midway group, Paleocene, Texas. 



Ellipsonodosaria alexanderi, Cushman (part), 

 1940, Cushman Lab. Foram. Research Contr., 

 vol. 16, p. 69, pi. 11, figs. 27, 29 only; Midway 

 group, Paleocene, Texas, 



Test elongate, slightly curved; chambers 

 elongate to globular, increasing in size and 

 length upward; initial chamber smaller than 

 one next above, free of costae, terminated 

 by relatively large spine; costae on succeed- 

 ing chambers nine or less, discontinuous, 

 each terminating in spine overhanging con- 

 stricted region of sutures; average diameter, 

 0.20 mm.; length (3 chambers), 0.75 mm. 



This species differs from N. spinulosa 

 (Montagu) of various authors and E. alex- 

 anderi Cushman in that it is regularly cos- 

 tate as in N. latejugata Giimbel and others 

 of this type, but the costae of N. spinocos- 

 tata end in spines as shown by Plummer 

 (1927, p. 4, fig. 19c) and Cushman (1940, 

 pi. 11, figs. 27, 29). The holotype of E. 

 alexanderi Cushman (1936, pi. 9, fig. 9) shows 

 the characteristically irregular distribution 

 of the spines over the entire surface of the 

 chamber wall. 



Explanation of Plate 55 



Figs. 1, 2 — Rohulus magnificus Toulmin. 1, Peripheral view; 2, dorsal view. X20. (p. 350) 



J, 4 — Recto giimbelina alahamensis Cushman. X90. (p. 351) 



5,6 — Vaginulina gracilis Flummer. X60. _ (p. 351) 



7-9 — Siphonina prima Plummer. 7, Dorsal view; 8, peripheral view; 9, ventral view. X90. 



• (p. 353) 

 10 — Dentalina.ci. D. communis (d'Orhigny). X90. _ (p. 346) 



11-13 — Eponides exigna limhata Plummer. 11, Ventral view; 12, peripheral view; 13, dorsal view. 

 X90. (p. 353) 



14, 15 — Nodosaria cf. N. vertehralis (Batsch). 1, Top view of broken specimen; 2, lateral view of 

 three chambers. X 20. (p. 350) 



16, 17 — Vaginulina robusta Plummer. Opposite sides of one specimen. X40. (p. 351) 



18, 19 — Nodosaria zippei Reuss. Top and lateral views. X20. (p. 350) 



20, 21 — Palmula mcglamerae Toulmin. Opposite views of one specimen. X40. (p. 350) 



22-23 — Robulus midwayensis (Plummer). 22, Peripheral view; 23, dorsal view. X40. _ (p. 351) 

 24-25 — Nodosaria latejugata Gumbel. 24, Top view, broken along suture; 25, lateral view. X20. 



(p. 348) 



26-27 — Robulus inornatus (d'Orbigny). 26, Peripheral view of broken shell showing the oval, 



slit-Hke aperature; 27, dorsal view. X40. (p. 350) 



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