STUDIES EST FORAMESTIFERA 



205 



Simpson core test 8, lat. 70°56'43" N., long. 155°17'16" 

 W., northern Alaska. 



Figured parat3rpe (USNM P4288) and unfigured 

 paratype (USNM P4289) from a core at 529-532 feet 

 in the Grandstand formation, in Umiat test well 3, lat. 

 69°23'16" N., long. 152°05'14" W., north of Umiat, 

 northern Alaska. 



Family Textnlariidae d'Orbigny, 1846 



Genus Spiroplectammina Cushman, 1927 



Spiroplectammina koveri Tappan, new species 



Plate 66, Figures 1, 2 



Test free, tiny, elongate, early chambers in a plani- 

 spiral coil, later chambers biserially arranged, increas- 

 ing gradually in breadth as added, but increasing more 

 rapidly in relative height, from five to sLx pairs of 

 biserial chambers; sutures distinct, depressed, slightly 

 oblique; wall finely agglutmated, rather smoothly 

 finished; aperture a low arch at the base of the final 

 chamber. 



Length of holotype 0.49 mm., greatest breadth 0.18 

 mm., greatest thickness 0.06 mm. Paratype specimens 

 range from 0.34 to 0.57 nmi. in length. 



Remaeks: This species differs from Spiroplectam- 

 mina longa Lalicker in being smaller and less tapering, 

 and in the more gradual increase in chamber size with 

 development. It occurs in the Topagoruk formation. 



It is named in honor of A. N. Kover, geologist, U. S. 

 Geological Survey. 



Types and occurrence: Holotype (USNM P4290) 

 and unfigiu-ed paratypes (USNM P4291) from a core 

 in the Topagoruk formation at 459-469 feet, in South 

 Barrow test well 2, at lat. 71°15'15" N., long. 156° 

 37'55" W., south-southwest of Point Barrow, northern 

 Alaska. 



Figured paratype (USNM P4292) and unfigured 

 paratypes (USNM P4293) from a core at 1,342-1,352 

 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 paratypes (USNM P4294) from a core at 

 1,030-1,040 feet in the Topagoruk formation, in Simp- 

 son test well 1, at lat. 70°57'05" N., long. 155°21'45" 

 W., west of Cape Simpson, northern Alaska. 



Unfigured paratype (USNM P4295) from seismo- 

 graph party 47, line 27-48, shot hole 8, at 190-200 feet, 

 lat. 71°15'58" N., long. 156°37'27" W., northern 

 Alaska. 



Spiroplectanunina webberi Tappan, new species 

 Plate 66, Figures 3-5 



Test free, small, elongate, base rounded with early 

 portion planispiral, later biserial with sides gradually 

 flaring; chambers increasing gradually in size, about 

 three or four pair of biserial chambers, of nearly equal 

 height and breadth; sutures slightly depressed, nearly 

 horizontal in the biserial portion; wall agglutinated, of 



fine to medium grains, roughly finished ; aperture at the 

 base of the inner margin of the chamber. 



Length of holotype 0.44 mm., breadth 0.21 mm., 

 thickness 0.08 mm. Paratypes range from 0.26 to 0.88 

 mm. in length. 



Remarks: This species differs from S. mordenensis 

 Wickenden in being larger and more compressed, in 

 having a relatively smaller coil, higher biserial cham- 

 bers, and a more flaring test. It occm-s throughout the 

 Colville group, from the Seabee formation to the Sen- 

 tinel Hill member of the Schrader Bluff fonnation. 



The species is named in honor of E. J. Webber, 

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



Types and occurrence: Holotype (USNM P4348) 

 and imfigm-ed paratypes (USNM P4349) from the Sea- 

 bee fonnation (field sample 47AWb 150) and unfigured 

 paratypes (USNM P4350) from the Seabee formation 

 (field sample 47 A Wb 155) both samples from an out- 

 crop on the Nanushuk River, south-southeast of Umiat, 

 at approximately lat. 69°03' N., long. 150°56' W., in 

 northern Alaska. Collected by E. J. Webber, 1947. 



Unfigured paratypes (USNM P4351) from 31 to 42 

 feet above the base of the Sentinel HiU member of the 

 Schrader Bluff formation (field sample 47A St 25), on 

 the north bank of the Colville River, about 7K miles 

 southwest of the confluence with the Chandler River, 

 at approximately lat. 69°25' N., long. 151°48' W., 

 northern Alaska. CoUected by Karl Stefansson, 1947. 



Figm-ed paratypes (USNM P4352 a, b) and unfigured 

 paratypes (USNM P4353) from a core at 1,110-1,120 

 feet in the Sentinel Hill member of the Schrader Bluff 

 formation, in Sentinel Hill core test 1, at lat. 69°37'30" 

 N., long. 151°27' W., on the west bank of the Colville 

 River, northern Alaska. 



Unfigured paratypes (USNM P4354) from a core at 

 490-499 feet in the Seabee formation, in Umiat test 

 well 1, west of Umiat, at lat. 69°24' N., long. 154°20' 

 W., in the northern foothills of the Brooks Range, 

 northern Alaska. 



Genus Textularia Defrance, 1824 



Textularia topagorukensis Tappan, new species 



Plate 66, Figures 8, 9 



Test free, tiny, tapering, biserial throughout; cham- 

 bers numerous, somewhat inflated, increasing gradually 

 in size ; wall finely agglutinated, commonly crushed and 

 distorted in preservation; apertm-e at the base of the 

 final chamber. 



Length of holotype 0.46 mm., breadth 0.17 mm., 

 thickness 0.07 mm. Paratypes range from 0.23 to 0.60 

 mm. in length. 



Remarks: Textularia topagorukensis, new species, dif- 

 fers from T. rollaensis Stelck and Wall in the lower and 

 more numerous chambers, more horizontal sutures, and 

 more nearly parallel sides. It is fo\md in the Grand- 

 stand and Topagoruk formations. 



Types and occurrence: Holotype (USNM P4296) 

 and unfigured paratypes (USNM P4297) from a core 



