STUDIES IN FORAMnsriFERA 



187 



Globorotalia angulata (White) 



Plates 45, Figures 7 a-c; 48, Figures 2a-c; 50, Figures 4a-c; 

 55, Figures 2, 6, 7; 58, Figures 2a-c; 64, Figures 5a-c 



Globigerina angulata White, Journ. Paleontol., vol. 2, p. 191, 



pi. 27, figs. 13a-c, 1928. 

 Globorotalia wilcoxensis Cushman and Ponton, Shipflett, 



Maryland Dep. Geol., Mines and Water Resources Bull. 3, 



p. 73, pi. 4, figs. 20-22, 1948. 



Test free, trochospirally coiled, peripheral margin 

 truncate and sharply angled, peripheral outline lobulate, 

 biconvex to umbilicoconvex, umbilicus small, rounded 

 and deep; chambers lunate in spiral view, cuneate in 

 umbilical view, angular rhomboid in edge view, um- 

 bilical shoulder acutely angled, 4 to 4K chambers per 

 whorl, increasing rapidly in size ; sutmes distinct, cm-ved 

 and oblique on the spiral side, strongly depressed, 

 straight and radial on the umbilical side and very 

 strongly incised in the peripheral area ; wall calcareous, 

 finely perforate, surface smooth to lightly spinose on 

 the spiral side, more prominently spinose on the um- 

 bilical side, and at the peripheral margins; aperture 

 interiomarginal, extraumbilical-umbilical, a high arch 

 directed somewhat forward, with a narrow bordering 

 lip preserved in some specimens. 



Hypotypes range in diameter from 0.30 to 0.45 mm., 

 and in thickness from 0.20 to 0.28 mm. 



Remarks: Globorotalia angulata (White) differs from 

 0. rex Martin in having a more angled and elevated 

 umbilical shoulder, the chambers are slightly inflated 

 on the spiral side, with sutures depressed, and have an 

 imbricated appearance, the posterior margin of each 

 succeeding chamber attaching below the anterior mar- 

 gin of that preceding, whereas in G. rex the spiral 

 chamber surface forms a plane. 



Types and occurrence : Figured hypotypes (USNM 

 P5127a-c) from the Vincentown limesand, north bluff 

 of Rancocas Creek, 0.3 to 0.5 miles north of Vincen- 

 town, Burlington County, New Jersey. Collected by 

 A. R. Loeblich, Jr., and Norman Sohl. 



Figured hypotype (USNM P5126) from the Salt 

 Mountain limestone, in a limestone sink % mile north 

 of Salt Mountam in the N"WKNW%, Sec. 34, T. 6 N., 

 R. 2 E., Clarke County, Alabama. Collected by H. T. 

 and A. R. Loeblich, Jr. 



Figm-ed hypotype (USNM P5859) from the Aquia 

 formation, 15 to 17 feet above the base of the exposure, 

 near mouth of Aquia Creek, S. 10° E. of Brent Point 

 on U. S. Geological Survey Nanjemoy Md.-Va. Quad- 

 rangle, 1:62,500, 1913, reprinted 1945. Collected by 

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



Figured hypotype (USNM P5891) from the Velasco 

 formation, middle bed at road crossing of arroyo, half- 

 way between San Jose de las Rusias and Soto la Marina, 

 Tamaulipas, Mexico. Collected by R. Wright Barker. 



Figured hypotype (USNM P5892) from the Mat- 

 thews Landing marl member of the Porters Creek clay 

 at Naheola Landing on the Tombigbee River, SE)i, 

 Sec. 30, T. 15 N., R. 1 E., 11 miles east of Jachin, 

 Choctaw County, Alabama. Collected by A. R. 

 Loeblich, Jr. 



398818—57 13 



Figured hypotype (USNM P5893) from the Horners- 

 town formation, north bank of Shingle Run, a tributary 

 to Crosswicks Creek, 1.0 mile north of New Egypt, 

 Monmouth County, New Jersey. Collected by A. R. 

 Loeblich, Jr., and Norman Sohl. 



Globorotalia apanthesma Loeblich and Tappan, new species 



Plates 48, Figures la-c; 55, Figures la-c; 58, Figures 

 4a-c; 59, Figures la-c 



Globorotalia cf. angulata (White) Shifflett, Maryland Dep. 

 Geol., Mines and Water Resources Bull. 3, p. 72, pi. 4, 

 figs. 18a-c.l948. 



Test free, trochospiral, planoconvex, umbilicoconvex, 

 with rather wide, deep and open umbilicus, periphery 

 subacute, peripheral outline lobulate; chambers hemi- 

 spherical, flattened to gently convex and appearing 

 limate in side view from the spiral side, strongly in- 

 flated to subangular on the umbihcal side, 4 to 5 in the 

 final whorl, commonly somewhat obliquely overlapping 

 earlier chambers, the forward margin of each chamber 

 protruding shghtly above the general level of the spiral 

 side, the posterior margin of the succeeding chamber 

 beginning at a shghtly lower level; sutures distinct, 

 strongly curved and slightly depressed on the spiral 

 side, radial and strongly depressed on the umbilical 

 side, wall calcareous, rather coarsely perforate, surface 

 spinose, most strongly on the umbihcal side; aperture 

 interiomarginal, extraumbilical-umbilical, a broad arched 

 opening, with a narrow bordering hp present in well 

 preserved specimens. 



Hypotypes range from 0.23 to 0.45 mm. in diameter 

 and from 0.15 to 0.33 mm. in thickness. 



Remarks: Globorotalia apanthesma, new species, 

 differs from G. acuta Toulmin in lacking a peripheral 

 keel, in having a spinose surface, less angular chambers, 

 more convex spiral side, and less ornamented umbihcal 

 shoulder. 



Globorotalia angulata (White) differs in being larger, 

 in having fewer chambers and more rapid increase in 

 chamber size and the chambers are more angidar in 

 spiral view, more inflated in umbihcal view, with a 

 more trimcate periphery and a more finely spinose 

 surface. 



The specific name is from the Greek apanthisma, a 

 plucked flower. 



Types and occurrence: Holotype (USNM P5860) 

 and figured paratype (USNM P5868) from the Aquia 

 formation, 10 to 13 feet above the base of the exposed 

 section, west bank of Potomac River, near mouth of 

 Aquia Creek, S. 10° E. of Brent Pomt 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. 



Figured paratype (USNM P5861) from the Vincen- 

 town formation, north bluff of Rancocas Creek, 0.3 to 

 0.5 miles north of Vincentown, Burlington Co., New 

 Jersey. Collected by A. R. LoebUch, Jr., and Norman 

 Sohl. 



Figiired paratype (USNM P5862) from the Salt 



