STUDIES IN FORAMINIFERA 



195 



Cloborotalia rex Martin 



Plate 60, Figures la-c 



Globoroialia rex Martin, Stanford Univ. Publ., Univ. Ser., 

 Geol. Sci., vol. 3, No. 3, p. 117, pi. 8, fig. 2, 1943. 



Test free, planoconvex, spiral side flattened, umbili- 

 cal side convex to subconical, umbilicus small, periph- 

 ery keeled, peripheral outline slightly lobulate; 

 chambers increasing rapidly in size, commonly with 

 4 chambers in the final whorl, final chamber comprising 

 % to % of the umbilical side, chambers gently convex 

 at the umbilical shoulder; sutures somewhat indistinct 

 on the spiral side, very gently curved, thickened and 

 may be flush or very moderately elevated, especially 

 near the peripheral margin, sutures radial and depressed 

 on the umbilical side; wall calcareous, finely perforate, 

 surface smooth on spiral side, with a gramdated appear- 

 ance on the vmibHical side, becoming rougher toward 

 the peripheral margin to appear somewhat spinose, 

 peripheral keel somewhat beaded; aperture a very low 

 interiomarginal, extraumbilical-umbilical arch. 



Greatest diameter of hypotypes 0.38 mm. 



Remarks: Globoroialia rex differs from G. angulata 

 (Wbite) in the flat spiral side with flush sutures, rather 

 than the uneven spiral side and depressed sutm-es. It 

 has a less markedly lobulate periphery, more pro- 

 nounced keel, less angular umbihcal shoulder and smal- 

 ler umbilicus. 



Types and occurrence: Figured hypotype (USNM 

 P5867) from the Nanafalia formation, top of exposure of 

 Ostrea thirsae beds, road cut 0.2 mile east of Turkey 

 Creek bridge, 1.2 nules east of Kimbrough Station, 

 Wilcox County, Alabama. Collected by A. R. Loe- 

 blich, Jr. 



This species was originally described from the Lodo 

 formation of California. 



Globoroialia strabocella Loeblich and Tappan, new species 

 Plate 61, Figures 6a-c 



Test free, of medium size, trochospiral, sides modei- 

 ately convex, umbilical shoulder rounded, umbilicus 

 broad and open, periphery broadly rounded, peripheral 

 outline lobulate; chambers increasing gradually in size 

 as added, of greater breadth than height, 4 per whorl 

 in the early stages, increasing to 5 or 6 per whorl in 

 the adult, early whorls somewhat elevated above the 

 level of the final whorl, each successive chamber on the 

 spiral side added somewhat below the level of that 

 preceding, resulting in an imbricated appearance; 

 sutures distinct, depressed, curved and oblique on the 

 spiral side, radial and nearly straight on the umbilical 

 side; wall calcareous, finely perforate, surface finely 

 spinose, especially on the umbilical side; aperture an 

 interiomarginal, extraumbilical-umbilical opening ex- 

 tending to the periphery. 



Holotype is 0.33 mm in greatest diameter. 



Remarks: Globoroialia strabocella, new species, differs 

 from G. apanthesma, new species, in the more elevated 

 early whorls and less truncate spiral side, broadly 



396818—57 14 



rounded instead of subacute periphery, more rounded 

 chambers and less curved sutures on the spiral side. 



It differs from Globigerina mckannai White in being 

 somewhat more compressed, with less globular cham- 

 bers and a more extraumbilical aperture. G. mckannai 

 may have been ancestral to the present species. 



The specific name is from the Latin strabus, oblique, 

 and cella, chamber, referring to the oblique attachment 

 of successive chambers on the spiral side. 



Types and occurrence: Holotype (USNM P5879) 

 from the Nanafalia formation, south valley wall of 

 Shoal Creek, 5.5 mUes southeast of Camden, along the 

 Camden-Fatama road, Wilcox County, Alabama. 

 Collected by A. R. Loeblich, Jr. 



The species also occurs rarely in the Vincentown 

 formation. 



Cloborotalia tribulosa Loeblich and Tappan, new species 

 Plates 56, Figures 3a-c; 61, Figures 7a-o 



Test free, trochospiral, biconvex, spire nearly flat, 

 umbilicus small and deep, periphery rounded, peripheral 

 outline lobulate; chambers globular, increasing rapidly 

 in size, forming about 2% whorls, commonly with 4 to 

 5 chambers in the final whorl; sutures distinct, con- 

 stricted, gently curved to radial; wall calcareous, dis- 

 tinctly perforate throughout, surface finely but promi- 

 nently hispid; aperture an interiomarginal, extra- 

 umbilical-umbilical, high, broad arch. 



Greatest diameter of holotype 0.30 mm. Paratype 

 0.28 mm. in diameter. 



Remarks: The species somewhat resembles Globoro- 

 ialia pseudobidloides (Plummer) in general appearance, 

 differing in the spinose surface. It differs from Globi- 

 gerina esnaensis LeRoy in being much smaller, and in 

 having more globular chambers. 



The specific name comes from the Latin tribiilosus, 

 thorny, and refers to the spinose wall. 



Types and occurrence: Holotype (USNM P5850) 

 from the Nanafalia formation, basal 6 feet of the for- 

 mation, road cut 0.2 mile east of Turkey Creek bridge 

 and 1.2 miles east of Kimbrough Station, Wilcox 

 County, Alabama. Collected by A. R. Loeblich, Jr. 



Paratype (USNM P5851) from the Aquia formation, 

 14 to 16 feet above the base of the exposure, west bank 

 of Potomac River, near mouth of Aquia Creek, S. 10° 

 E. of Brent Point on U. S. Geological Survey Nanjemoy 

 Md.-Va. Quadrangle, 1:62,500, 1913, reprinted, 1945. 

 Collected by A. R. Loeblich, Jr., and Richard A. Page. 



Cloborotalia trichotrocha Loeblich and Tappan, new species 

 Plates 50, Figures 5a-c; 57, Figures la-2c 



Test free, small, trochospiral, spiral side flattened, 

 umbilical side strongly convex and highest at the um- 

 bilical shoulder around the small deep umbilicus, 

 periphery subangular, peripheral outline only slightly 

 lobidate; chambers low and relatively broad on the 

 spiral side, with 6 or more rarely 7 in the final whorl, 

 the chambers sloping sharply outward to the periphery 

 from the umbilical shoulder at the small umbilicus, 



