STUDIES EST FORAMINIFERA 



197 



shoulder around the broad and open umbilicus, the 

 umbilical shoulder strongly thickened, highly spinose, 

 and may even form an everted coUar, chamber wall 

 sloping sharply in both directions from this umbilical 

 shoulder, periphery with a distinct, wide and spinose 

 keel, peripheral outline lobulate; chambers increasing 

 gradually in size, 7 to 9 in the final whorl; sutirres 

 distinct, thickened, elevated, oblique and beaded on 

 the spiral side, radial, depressed and straight on the 

 umbilical side; wall calcareous, finely perforate, orna- 

 mented with the beaded sutm-es, beaded or spinose 

 peripheral keel, and thickened and spinose collar at the 

 umbilical shoulder; aperture an interiomarginal, extra- 

 umbilical-umbilical arch with a narrow lip. 



Hypotypes range from 0.42 to 0.60 mm. in diameter. 



Remarks: This species is characterized by the 

 limbate and beaded sutures, wide umbilicus and highly 

 ornate collar at the umbilical shoulder. Globorotalia 

 acuta Toulmin differs in lacking the beaded sutures, 

 and in having fewer chambers per whorl. Globorotalia 

 apanthesma, new species, lacks the umbilical collar, and 

 has depressed sutures on the spiral side. Globorotalia 

 occlusa, new species, has a very narrow umbilicus and 

 no umbilical coUar. 



Types and occurrence : Figured hypotypes (USNM 

 P5871a,b) from the Velasco formation, middle bed at 

 road crossing of arroyo halfway between San Jos6 de las 

 Rusias and Soto la Marina, Tamaulipas, Mexico. 

 Collected by R. Wright Barker. 



Globorotalia Bpecies 

 Plate 45, Figures 8a-c 



Test free, small, trochospiral, compressed, umbilicus 

 tiny, peripheral outline slightly lobulate, peripheral 

 angle subacute; chambers in about two whorls, iji 

 broad low chambers in the final whorl, gently convex 

 on the spiral side, more elevated on the umbilical side, 

 with a rounded to subacute umbilical shoulder; sutures 

 distinct, slightly depressed, curved and oblique on the 

 spiral side, nearlj^ straight and radial on the umbilical 

 side; wall calcareous, finely perforate, siu-face smooth, 

 except near the periphery where it becomes very finely 

 hispid; aperture interiomarginal, extraumbilical- 

 umbilical, bordered above by a narrow lip. 



Greatest diameter of figured specimen 0.20 mm. 



Remarks: This species somewhat resembles Globoro- 

 talia pseudoscitula Glaessner, but has somewhat higher 

 chambers on the spiral side, is less prominently perforate 

 or punctate, is more compressed and has fewer chambers 

 per whorl. It differs from G. pusilla Bolli in being more 

 compressed, with a more flattened spiral side and higher 

 chambers, and a m.ore gradual increase in chamber size. 

 Because it is quite rare it is not here described as a 

 new species. 



Types and occurrence: Figiu-ed specimen (USNM 

 P5880) from the Matthews Landing marl member of 

 the Porters Creek clay, Naheola Landing, Tombigbee 

 River, SEX, Sec. 30, f. 15 N., R. 1 E., 11 miles east of 

 Jachin, Choctaw County, Alabama. Collected by A. 

 R. Loeblich, Jr. 



References 



Bolli, H. M. 



1957. The genera Globigerina and Globorotalia in the Paleocene - lower Eocene Lizard Springs for- 

 mation of Trinidad, B. W. I. U. S. Nat. Mus. Bull. 215, pp. 61-81, pis. 15-20. 

 Bolli, H. M., Loeblich, A. R., Jr., and Tappan, H. 



1957. The planktonic foraminiferal families Hantkeninidae, Orbulinidae, Globorotaliidae, and 

 Globotruncanidae. U. S. Nat. Mus. Bull. 215, pp. 3-50, pis. 1-11. 

 Bkonnimann, p. 



1952. Trinidad Paleocene and lower Eocene Globigerinidae. Bull. Amer. Paleontol., vol. 34, 



No. 143, pp. 153-182, pis. 11-13. 



1953. Note on planktonic Poraminifera from Danian localities of Jutland, Denmark. Eclog. 



Geol. Helvetiae, vol. 45 (1952), No. 2, pp. 339-341. 

 Beotzen, F. 



1948. The Swedish Paleocene and its foraminiferal fauna. Sveriges. Geol. Undersokning, Avh., 

 ser. C, No. 493 (Arsbok 42, No. 2), pp. 1-140, pis. 1-19. 

 Canu, F., and Bassler, R. S. 



1933. The bryozoan fauna of the Vincentown limesand. U. S. Nat. Mus. Bull. 165, pp. 1-108. 

 pis. 1-21. 

 Clark, W. B., Bagq, R. M., and Shattuck, G. B. 



1897. Upper Cretaceous formations of New Jersey, Delaware and Maryland. Bull. Geol. Soc. Amer., 

 vol. 8, pp. 315-358, pis. 40-50. 

 Cooke, C. W., and Stephenson, L. W. 



1928. The Eocene age of the supposed late Upper Cretaceous Greensand marls of New Jersey. 

 Journ. Geol., vol. 36, pp. 139-148. 



