202 



•DNITED STATES NATIONAL MUSEtTM BULLETIN 215 



Assistance is also acknowledged from George Gryc, 

 from Harlan Bergquist, who has discussed with the 

 writer many features of the micropaleontology and 

 stratigraphic zonation, and from Florence Kobinson 



and Florence Rucker, who determined lithologic types. 

 Illustrations for the present paper are shaded camera 

 lucida drawings by the writer and by Patricia Isham, 

 scientific illustrator, Smithsonian Institution. 



Systematic Descriptions 



Family Rhizamminidae Cushman, 1927 



Genus Bathysiphon Sars, 1872 



Bathysiphon brosgei Tappan, new species 



Plate 65, Figures 1-6 



Test free, elongate, consisting of an undivided 

 tubular chamber, commonly straight but rarely some- 

 what irregularly bent or curved ; wall finely agglutinated 

 with considerable cement, rather smoothly finished, 

 surface may have transverse growth wrinkles, irregu- 

 larly spaced; aperture rounded at the open end of the 

 tubular chamber. 



Length of holotype 1.22 mm., greatest breadth 0.31 

 mm. Other specimens range from 0.34 to 1.66 mm. 

 in length and from 0.10 to 0.32 mm. in breadth. 



Rem.ikks: Bathysiphon brosgei Tappan, new species, 

 differs from the associated B. vitta Nauss in being much 

 narrower, about one-third to one-fifth as broad, and 

 in having a somewhat more roughened surface. It is 

 similar in appearance to the figures of B. alexanderi 

 Cushman, but an examination of the type specimens 

 of the latter shows them to be inorganic limonitic sticks, 

 and not Foraminifera. B. brosgei occurs throughout 

 the Nanushuk group and the underlying Fortress 

 Mountain formation. It is named in honor of W. P. 

 Brosg^, geologist, U. S. Geological Survey. 



Types and occurrence: Holotype (USNM P4216), 

 figured paratypes (USNM P4217a,b) and unfigured 

 paratypes (USNM P4218) from the Topagoruk forma- 

 tion in a core at 2,235-2,245 feet, unfigured paratypes 

 (USNM P4219) from a core at 1,247-1,267 feet, un- 

 figured paratype (USNM P4220) from a core at 1,197- 

 1,207 feet, all from Simpson test well 1, at lat. 70°57'05" 

 N., long. 155°21'45" W., west of Cape Simpson, 

 northern Alaska. 



Unfigured paratype (USNM P4221) from well 

 cuttings at 3,650-3,660 feet and unfigured paratype 

 (USNM P4222) from well cuttings at 3,930-3,940 feet, 

 both in the Topagoruk formation in Umiat test well 1, 

 at lat. 69°23'52" N., long. 152°19'45" W., west of 

 Umiat, hx the northern foothills of the Brooks Range, 

 northern Alaska. 



Unfigured paratypes (USNM P4223) from well 

 cuttings at 2,640-2,650 feet and figured parat3rpes 

 (USNM P4224a,b) from well cuttings at 2,670-2,680 

 feet, aU in the Topagoruk formation in Umiat test 

 well 2, at 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 P4225) from the Fort- 

 ress Mountain formation (field sample 49A Pa 125), 



on a small north-flowing tributary to Fortress Creek, 

 which flows into the Ayiyak River, northeast of 

 Fortress Mountam, lat. 68°30' N., long. 153°05'30" W., 

 in the southern foothills of the Brooks Range, northern 

 Alaska. Collected by W. W. Patton, Jr., 1949. 



Family Hyperamminidae Cushman, 1910 



Genus Hyperamminoides Cushman and Waters, 1928 



Hyperamminoides barksdalei Tappan, new species 



Plate 65, Figures 6-12 



Test free, flattened, elongate, somewhat flaring, 

 consisting of an undivided tubular chamber with 

 occasional growth wrinkles or constrictions but without 

 internal partitions; wall finely arenaceous, smoothly 

 finished; aperture a rounded opening at the somewhat 

 constricted end of the chamber. 



Length of holotype 0.55 mm., breadth 0.26 mm. Para- 

 types range from 0.26 to 1.12 mm. in length. 



Remarks: Hyperamminoides barksdalei, Tappan, new 

 species, differs from H. elegans (Cushman and Waters) 

 ia being less tapering and much smaller and in having 

 less constricted transverse growth wrinkles. This 

 species occurs in the Topagoruk and Grandstand 

 formations. It is named in honor of W. L. Barksdale, 

 geologist, formerly with the U. S. Geological Survey. 



Types and occurrence: Holotype (USNM P4386) 

 from a core at 196-201 feet and unfigured paratypes 

 (USNM P4387) from a core at 438-443 feet in the 

 Grandstand formation; and unfigured paratypes 

 (USNM P4388) from a core at 1,302-1,312 feet in the 

 Topagoruk formation; all from Simpson test well 1, at 

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

 Simpson, northern Alaska. 



Figured paratype (USNM P4389) from well cuttings 

 at 2,110-2,120 feet in the Topagoruk formation, in 

 South Barrow test well 1, at lat. 71°19'12" N., long. 

 156°42'16" W., southwest of Point Barrow, northern 

 Alaska. 



Figured paratype (USNM P4390) and unfigured 

 paratypes (USNM P4391) from a core at 660-670 feet 

 in the Topagoruk formation, in South Barrow test well 

 2, at lat. 71°15'49" N., long. 156°38'03" W., south- 

 southwest of Point Barrow, northern Alaska. 



Unfigured paratypes (USNM P4392) from a core at 

 950-960 feet in the Topagoruk formation, in Arcon 

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

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

 Alaska. 



Figured paratype (USNM P4226) from the Grand- 

 stand formation, 2,000 feet below the top (field sample 

 47A Dt 236), about 4K miles airline upstream from 



