190 



insriTED STATES NATIONAL MUSEUM BULLETIN 215 



Because of the extraiimbilical position of the aper- 

 ture, the species is here regarded as a Globorotalia. 



The specimen here figured from the Aqiiia formation 

 is somewhat questionably referred to this species, as 

 the early spire is more elevated than is usual in this 

 species. Other specimens from the Aquia are quite 

 typical, however, and this specimen is regarded as 

 atypical. 



Types and occurrence: Figured hypotypes 

 (USNM P5876a,b) from the NanafaUa formation, 

 basal six feet of the formation, in road cut 0.2 miles 

 east of Turkey Creek bridge and 1 .2 miles east of Kim- 

 brough Station, Wilcox County, Alabama. Collected 

 by A. R. Loebiich, Jr. 



Figm-ed hypotype (USNM P5877) from the upper 

 25 feet of the Nanafalia formation exposed in the road 

 cut at the above locality. 



Figured hypotype (USNM P5878) from the Aquia 

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

 section, west bank of Potomac River, near mouth of 

 Aquia Creek S. 10° E. of Brent Point on U. S. Geo- 

 logical Survey Nanjemoy Md.-Va. Quadrangle. 

 1:62,500, 1913, repriuted 1945. Collected by A. R. 

 Loebhch, Jr., and Richard A. Page. 



Globorotalia hispidicidaris Loebiich and Tappan, new species 

 FliATB 68, FlGUBES la-c 



Test free, of medium size, trochospiral, spiral side 

 gently convex, umbUical side inflated, periphery 

 angularly truncate, peripheral outline gently lobulate; 

 chambers increasing slowly in size, 5 per whorl in early 

 stages, final whorl with 6 to 7 chambers; sutures dis- 

 tinct, slightly depressed, curved and obfique on the 

 spiral side, more deeply depressed, straight and radial 

 aroimd the small umbilicus on the umbUical side; wall 

 calcareoiis, finely perforate, surface spiuose throughout, 

 although final one or two chambers may be less promi- 

 nently spinose, distinctly spinose at the peripheral 

 angle, presenting a keel-like appearance ; apertirre a low 

 interiomarginal, extraumbilical-umbifical arch extend- 

 ing to the periphery. 



Holotype 0.35 mm. in diameter. 



Remarks: This species resembles Globorotalia conico- 

 truncata Subbotina from the Russian Danian(?) in the 

 numerous chambers per whorl, truncated spiral side, 

 and the angular-trimcate periphery. The present 

 species is smaller and has a promiaently spinose surface. 



It differs from Globigerina mckannai "White in being 

 less thickened and more nearly keeled, in having more 

 chambers per whorl, more obhque sutm-es on the spiral 

 side, and a truncate rather than roimded periphery. 



Globorotalia apanthesma, new species, has fewer 

 chambers per whorl, a less truncate periphery and the 

 chambers slope gradually from the peripheral keel to 

 the umbilical shoulder. The wall surface is also less 

 prominently spinose. 



The specific name is from the Latin hispidus, bristly, 

 prickly, and cidaris, a diadem or tiara, referring to the 

 general appearance of the species. 



Types and occurrence: Holotype (USNM P5875) 

 from the Aquia formation, 15 to 17 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, reprmted 1945, Collected by A. R. 

 Loebiich, Jr., and Richard A. Page. 



Globorotalia imitata Subbotina 



Plates 44, Figures 3a-c; 45, Figures 6a-c; 54, Figures 8a-9c; 



59, Figures 5a-c; 63, Figures 3a-c 

 Globorotalia imitata Subbotina, Trudy Vses. Neft. Naukno- 



Issledov. Geol.-Razved. Inst., new ser., vol. 76, p. 206, pi. 



16, figs. 14r-16, 1953. 



Test free, tiny, spiral side flattened to gently convex, 

 peripheral margin rounded, peripheral outline lobulate; 

 chambers moderately inflated, ovate, increasing gradu- 

 ally in size and arranged in a low trochospiral coil of 

 about 2 volutions, 4 to 5 in the final whorl; sutures 

 distinct, slightly depressed, gently curved; wall cal- 

 careous, finely perforate, surface smooth; aperture 

 interiomarginal, extraumbilical-umbilical, a low arch, 

 bordered by a narrow, protruding lip. 



Hypotypes range from 0.15 to 0.25 mm. in diameter, 

 and from 0.09 to 0.13 mm. in thickness. 



Remarks : Originally described from strata of Danian 

 age in Russia, this species occurs in beds of equivalent 

 age in Texas (WUls Point formation), but also ranges 

 somewhat higher, occurring also iu the Matthews 

 Landing marl member of the Porters Creek clay of 

 Alabama, in the Vincentown formation of New Jersey 

 and the Aquia formation of Virginia. 



It somewhat resembles Globorotalia compressa (Plum- 

 mer) in general appearance, but has a less acute periph- 

 ery which is rounded to almost truncate, an almost 

 flattened spiral side, more curved sutures and lower 

 chambers. 



Types and occurrence: Figured hypotype (USNM 

 P5688) from the WUls Point formation (Mexia clay 

 member) in abandoned pit of the Mexia Brick Works 

 at Mexia, Limestone County, Texas. Collected by 

 A. R. Loebiich, Jr. 



Figured hypotype (USNM P5689) from the Matth- 

 ews Landing marl member of the Porters Creek clay, 

 at Naheola Landing, Tombigbee River, SE%, Sec. 30, 

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

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



Figured hypotype (USNM P5131 a, b) from the 

 Vincentown Ihnesand, along north bluff of Rancocas 

 Creek 0.3 to 0.5 mUe northwest of Vincentown, Burling- 

 ton County, New Jersey. Collected by A. R. Loebiich, 

 Jr., and Norman Sohl. 



Figured hypotype (USNM P5691) from the Aquia 

 formation, 15 to 17 feet above the base of the exposm-e, 

 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. Loebiich, Jr., and 

 Richard A. Page. 



Figured hypotype (USNM P5886) from the Velasco 



