STUDIES IN FOBAMINIFERA 



203 



the mouth of Fossil Creek, a small north-flowing 

 tributary to the Colville River, approximately at lat. 

 69°19'15" N., long. 152°28' W., in the northern 

 foothills of the Brooks Range, northern Alaska. 

 Collected by R. L. Detterman, 1947. 



Figured paratype (USNM P4227) from the lower 

 part of the Topagoruk formation, west fork of Birthday 

 Creek, Awuna River area (field sample 47A Wh 541), 

 lat. 69°11'30" N., long. 156°41' W., northern Alaska. 

 Collected by C. L. Whittington, 1947. 



Figured paratype (USNM P4228) from weU cuttings 

 at 1,370-1,380 feet, figured paratype (USNM P4229) 

 from well cuttings at 3,300-3,310 feet, and imfigured 

 paratypes (USNM P4230) from well cuttings at 

 1,290-1,300 feet, all in the Topagoruk formation, 

 Umiat test well 2, lat. 69°23'04" N., long. 152°05'01" 

 W., north of Umiat, in the northern foothills of the 

 Brooks Range, northern Alaska. 



Unfigured paratypes (USNM P4231) from the 

 Grandstand formation (field sample 47 A Tr 108), north 

 limb of Awuna anticline, on Discovery Creek, lat. 

 69°14' N., long. 157°25' W., in the northern foothills 

 of the Brooks Range, northern Alaska. Collected by 

 M. L. Troyer, 1947. 



Family Tolypamminidae Cushman, 1929 



Genus Involutina Terquem, 1862 



Involutina mangusi Tappan, new species 



Plate 65, Figures 13, 14 



Test free, discoidal, consisting of proloculus and long 

 undivided, planispiral, evolute second chamber, which 

 is relatively thick and forms only a few whorls; speci- 

 mens commonly compressed in preservation, surface 

 granular in appearance; wall finely to moderately 

 coarsely agglutinated; aperture at the open end of the 

 tubular chamber. 



Greatest diameter of holotype 0.49 mm., thickness 

 0.06 mm. Paratypes range from 0.36 to 0.68 mm. in 

 diameter. 



Remarks: Involutina mangusi Tappan, new species, 

 differs from Ammodiscus gaultinus Berthelin in being 

 about one-half as large, in having a relatively thicker 

 spiralling chamber, and in being more coarsely agglu- 

 tinated. The present species is more evenh^ plani- 

 spiral, rather than irregularly coiled in the early stages 

 as in A. gaultinus. The species is found in the Topa- 

 goruk and Grandstand formations and marine tongues 

 in the equivalent Chandler formation. It is named in 

 honor of M. D. Mangus, geologist, U. S. Geological 

 Survey. 



Types and occurrence: Holotype (USNM P4232) 

 and unfigured paratype (USNM P4233) from a core at 

 1,080-1,087 feet, unfigured paratype (USNM P4234) 

 from a core at 1,187-1,197 feet, unfigm-ed paratypes 



(USNM P4235) from a core at 1,247-1,267 feet, all in 

 the Topagoruk formation; and unfigured paratj-pe 

 (USNM P4236) from a core at 673-683 feet in the 

 Grandstand formation; all from Simpson test well 1, 

 lat. 70°57'05" N., long. 155°21'45" W., west of Cape 

 Simpson, northern Alaska. 



Unfigured paratypes (USNM P4237) from a core at 

 548-558 feet in the Topagoruk formation, in Arcon 

 Point Barrow core test 1, at lat. 71°20' N., long. 

 156°40' W., southwest of Point Barrow, northern 

 Alaska. 



Unfigured paratype (USNM P4238) from well cut- 

 tings at 1,130-1,140 feet and unfigured paratype 

 (USNM P4239) from well cuttings at 1,140-1,150 feet 

 in the Topagoruk formation, in South Barrow test 

 well 1, at lat. 71°19'12" N., long. 156° 42'15" W., 

 southwest of Point Barrow, northern Alaska. 



Paratype (fig. 14; USNM P4240) from field sample 

 47A Wh 623, residual soil of marine zone in Chandler 

 formation, on the south flank of the Awuna anticline, 

 lat. 69°03'18" N., long. 156°02'30" W., northern 

 Alaska. Collected by C. L. Whittmgton, 1947. 



Unfigured paratype (USNM P4241) from field sample 

 47A Wh 688, residual soil sample of the Grandstand 

 formation on the south flank of the Awuna anticline, 

 lat. 69°02'48" N., long. 155°59'30" W., northern 

 Alaska. Collected by C. L. Whittmgton, 1947. 



Family Lituolidae Reuss, 1861 



Genus Haplophragmoides Cushman, 1910 



Haplophragmoides topagorukensis Tappan, new species 



Plate 65, Figures 15-25 



Test free, planispiral and involute, occasional speci- 

 mens partly evolute, biumbUicate, periphery rounded, 

 8 to 12 chambers in the final whorl, increasing gradually 

 in size as added, and slightly inflated; sutures straight 

 and radial, somewhat thickened, moderately depressed; 

 wall finely agglutinated, with variable amount of 

 cement, test apparently not extremely rigid in original 

 character, as most tests are distorted in preservation, 

 those laterally crushed having the appearance of a 

 more sharply angled periphery; surface generally 

 smoothly finished, but those specimens from sandy 

 horizons commonly possessing a more roughened ex- 

 terior ; aperture an arch at the base of the final chamber 

 face on the periphery. 



Greatest diameter of holotype 0.62 mm., thickness 

 0.08 mm. Paratypes range from 0.31 to 1.87 mm. in 

 greatest diameter. 



Remarks: This is an extremely variable species in 

 size; and because of the prevalence of distorted tests 

 due to compression in preservation, it is variable in 

 apparent relative thickness and angularity of periphery. 

 However, as there are specimens crushed in different 

 directions as well as some pyrite-filled tests which are 



