STUDIES m FORAMINIFERA 



181 



chambers of the 2}^ to 3 whorls visible on the spiral 

 side, with earlier whorls distinctly elevated above the 

 level of the 4 to 5 chambers of the final whorl, only 

 the final whorl visible on the umbilical side, final cham- 

 ber may be somewhat reduced in size and bulla-like; 

 sutiu-es distinct, depressed, slightly curved; aperture a 

 small umbilical arch bordered with a narrow lip. 



Greatest diameter of holotype 0.20 mm., height of 

 spire 0.23 mm. 



Eemarks: G. chascanona, new species, differs from 

 G. aquiensis, new species, and G. spiralis BoUi in having 

 a very prominently spinose surface, smaller umbilical 

 area, lower apertiu-e, and in being much smaller in size. 



The specific name is from the Greek name for cockle- 

 bur, chaskanon. 



Types and occurrence: Holotype (USNM P5842) 

 and figured paratype (USNM P5843) from the Homers- 

 town formation, north bank of Shingle Kun, a tributary 

 to Crosswicks Creek, 1.0 mile north of New Egj^jt, 

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

 Loeblich, Jr., and Norman Sohl. 



Figiu-ed paratype (USNM P5844) from the Nana- 

 falia formation, basal 6 feet of formation, road cut, 0.2 

 mile east of Turkey Creek bridge, and 1.2 miles east of 

 Kimbrough Station, Wilcox County, Alabama. Col- 

 lected by A. K. Loeblich, Jr. 



Also occurs in the Aquia formation of Virginia. 



Globigerina inaequispira Subbotina 



Plates 49, Figures 2ar-c; 52, Figures la-2c; 66, Figures 7a-c; 

 61, Figures 3a-c; 62, Figures 2a-c 



Globigerina inaequispira Subbotina, Trudy Vses. Neft. Naukno- 



Issledov. Geol.-Razved. Inst., new ser., vol. 76, p. 69, 



pi. 6, figs. 1-4, 1953. 

 Globigerina Iriloculinoides Plummer, Shifflbtt, Maryland Dep. 



Geol., Mines and Water Resources Bull. 3, p. 71, pi. 4, 



figs. 16, 17, 1948. 



Test free, consisting of rapidly enlarging chambers in 

 a low trochospiral arrangement; chambers subglobular, 

 all visible on the spiral side, only the 3 to 4 chambers 

 of the final whorl visible on the umbilical side; sutures 

 distinct, depressed; wall calcareous, finely perforate, 

 surface finely spinose, becoming coarsely spinose in the 

 umbilical region; aperture interiomarginal and umbili- 

 cal, and may have a narrow bordering lip. 



Hypotypes range from 0.23 to 0.48 mm. in greatest 

 diameter and from 0.15 to 0.33 mm. in thickness. 



Eemarks: Originally described from the "Lower to 

 Middle Eocene" of Russia in a zone with Glohorotalia 

 velascoensis, Glohorotalia pseiidoscitula, and Globigerina 

 Iriloculinoides this species is here considered to be of 

 Paleocene age, as the G. velascoensis zone is so considered 

 elsewhere. G. inaequispira differs from G. Iriloculin- 

 oides Plummer in lacking the coarsely reticulate surface 

 and in being finely to prominently spinose. 



G. inaequispira is similar to G. linaperta Finlay which 

 also has a spiny surface, but in 6. linaperta the surface 

 also shows a reticulate pattern. 



The specimens referred to G. triloculinoides Plummer 

 by ShifHett (1948) are typical G. inaequispira, having 



the characteristic spiny siu^ace which is not found in 

 true G. triloculinoides. 



G. inaequispira has a somewhat more restricted 

 geologic range than does G. triloculinoides and is found 

 only in strata of middle to late Paleocene (Landenian) 

 age, not in the underlying lower Paleocene (Danian) 

 strata. 



Types and occurrence: Hypotype (USNM P5729) 

 from the Salt Mountain limestone in a limestone sink, 

 K mile north of Salt Mountain in the NWJ^NW)^, sec. 

 34, T. 6 N., E. 2 E., Clarke Coimty, Alabama. Col- 

 lected by H. T. and A. E. Loeblich, Jr. 



Figured hypotype (USNM P5730) from the Ostrea 

 thirsae beds of the Nanafalia formation, top of section 

 exposed, approximately 56 feet above the Midway 

 contact, in road cut 0.2 mile east of Turkey Creek 

 bridge, 1.2 mUes east of Kimbrough Station, Wilcox 

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



Figured hypotype (USNM P5731) from the Aquia 

 formation, 15 to 17 feet above base, west bank of 

 Potomac Eiver, near mouth of Aquia Creek, S. 10° E. 

 of Brent Point, on U. S. Geol. Survey Nanjemoy 

 Md.-Va. quadrangle, 1:62,500, 1913, reprmted 1945. 

 Collected by A. E. LoebHch, Jr., and Eichard A. Page. 



Figured hypotype (USNM P5732) from the Horners- 

 town formation, north bank of Shingle Eun, a tributary 

 to Crosswicks Creek, 1.0 mile north of New Egypt, 

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

 Loeblich, Jr., and Norman Sohl. 



Figured hypotype (USNM P5117a,b) from the 

 Vincentown formation, along north bluff of Eancocas 

 Creek, 0.3 to 0.5 mile northwest of Vincentown, 

 Burlington County, New Jersey. Collected by A. E. 

 Loeblich, Jr., and Norman Sohl. 



Figured hypotype (USNM P5881) from the upper 

 Velasco formation, middle bed at road crossing of 

 arioyo halfway between San Jos6 de las Eusias and 

 Soto la Marina, Tamaulipas, Mexico. Collected by 

 E. Wright Barker. 



Globigerina mckannai White 



Plates 47, Figures 7a-c; 53, Figures la-2c; 57, Figures 8a-c; 

 62, Figures 5a-7c 



Globigerina mckannai White, Journ. Paleontol., vol. 2, p. 194, 



pi. 27, figs. 16a-c, 1928. 

 Glohorotalia 7nckannai (White), Bolli, U. S. Nat. Mus. Bull. 215, 



p.79, pi. 19, figs. 16-18, 1957. 

 Globigerina cretacea var. esnehensis Nakkadt, Journ. Paleontol., 



vol. 24, p. 689, pi. 90, figs. 14-16, 1950. 

 Globigerina gravelli Bronnimann, Bull. Amer. Paleontol., vol. 34, 



No. 143, p. 160, pi. 11, figs. 16-18, 1952.— Bolli, U. S. Nat. 



Mus. Bull. 215, p. 72, pi. 16, figs. 1-3, 1957. 

 Globigerina sp., Hofker, Rep. McLean Foram. Lab., No. 2, 



p. 15, pi. 5, 1955. 



Test free, subglobular to slightly compressed, spiral 

 side convex, in a low trochospiral coil of 2}^ whorls, um- 

 bilical side convex with broad open umbilicus, periph- 

 eral margin broadly rounded to subtruncate, peripheral 

 outline lobulate; 5 to 6 globular to ovate chambers in 

 the final whorl, commonly 5, increasing regularly in 

 size; sutures distinct, depressed, slightly curved back- 



