STUDIES nsr foraminifera 



211 



Unfigured paratypes (USNM P4408) from field 

 sample 47A Wh 688, in residual soil of the Grandstand 

 formation, on the south flank of the Awuna anticline, 

 at lat. 69°02'48" N., long. 155°59'30" W., in the 

 northern foothiUs of the Brooks Kange, northern 

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



Figured paratype (USNM P4409) and unfigured 

 paratypes (USNM P4410) from field sample 47 A 

 Wh 655, in residual soU of marine or brackish tongues 

 in the Chandler formation, on the south flank of the 

 Awuna anticline, at lat. 69°06'48" N., long. 155°58' W., 

 in the northern foothills of the Brooks Range, northern 

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



|Unfigiu-ed paratypes (USNM P4411) from field 

 sample 47A Tr 293, from a marine zone in the Chandler 

 formation on the north flank of the Awuna anticline, at 

 lat. 69°09'30" N., long. 155°59' W., in the northern 

 foothills of the Brooks Range, northern Alaska. Col- 

 lected by M. L. Troyer, 1947. 



Unfigured paratypes (USNM P4412) from field 

 sample 47A Tm 13, bed 12, 60 feet below the top of 

 exposed 100-foot section of the Cretaceous, probably 

 equivalent to the lower part of the Nanushuk group of 

 the eastern areas, on the south limb of a syncline, on 

 the west bank of the Utukok River, at approximately 

 lat. 69°13' N., long. 160°38' W., about 70 miles east- 

 northeast of Cape Beaufort, in the northern foothills of 

 the Brooks Range, northern Alaska. Collected by 

 R. M. Thompson, 1947. 



Unfigured paratypes (USNM P4413) from field 

 sample 47A Z 604, in the Grandstand formation, on 

 the north limb of the Kurupa anticline, in a section from 

 lat. 68°55' N., long. 155°05' W., to lat. 69°00' N., 

 long. 155° W., along the Kurupa River, west-southwest 

 of Umiat, in the northern foothills of the Brooks Range, 

 northern Alaska. Collected by J. H. Zumberge, 1947. 



Unfigured paratype (USNM P4414) from a core at 

 432-439 feet in the Grandstand formation, in Umiat 

 test well 3, at lat. 69°23'16" N., long. 152°05'14" W., 

 north of Umiat, in the northern foothills of the Brooks 

 Range, northern Alaska. 



Figured paratype (USNM P4415) and unfigured 

 paratypes (USNM P4416) from a core at 256-264 feet, 

 in the Grandstand formation in Skull Cliff core test 1, 

 at lat. 70°55' N., long. 157°38' W., between Point 

 Barrow and Point Franklin, northern Alaska. 



Unfigured paratypes (USNM P4417) from a core at 

 443-444 feet in the Grandstand formation, in Simpson 

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

 west of Cape Simpson, northern Alaska. 



Unfigured paratypes (USNM P4418) from a core at 

 459-469 feet in the Topagoruk formation, in South 

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

 156°37'55" W., south-southwest of Point Barrow, 

 northern Alaska. 



Miliammina ischnia Tappan, new species 

 Plate 67, Figures 25, 26 



Test free, small, narrow, elongate, sides subparallel, 

 quinqueloculine in section; chambers narrow, elongate. 



a half coil in length; sutures distinct, depressed; wall 

 finely agglutinated, surface smoothly finished; aperture 

 at the open end of the final chamber. 



Length of holot)T)e 0.36 mm., breadth 0.10 mm. 



Remakks: Miliammina ischnia, new species, difl'ers 

 from M. manitobensis Wickenden in being smaller and 

 comparatively narrower and more elongate. It differs 

 from Miliammina awunensis, new species, in being 

 narrower with nearly parallel sides, rather than ovate 

 in outline. Miliolina gramen Friedberg is simDar in 

 general appearance, but is two to three times at large. 



This species is found in the Grandstand formation. 



Types and occurrence : Holotype USNM P4419) 

 and unfigured paratypes (USNM P4420) from a core at 

 1,910-1,920 feet and figured paratype (USNM P4421) 

 and unfigured paratypes (USNM P4422) from a core 

 at 1,693-1,703 feet, both in the Grandstand formation, 

 in Umiat test well 1, at lat. 69°23'52" N., long. 

 152°19'45" W., west of Umiat, in the northern foothills 

 of the Brooks Range, northern Alaska. 



Unfigured paratypes (USNM P4423) from a core at 

 432-439 feet in the Grandstand formation, in Umiat 

 test well 3, lat. 69°23'16" N., long. 152°05'14" W., 

 north of Umiat, in the northern foothills of the Brooks 

 Range, northern Alaska. 



Genus Psamminopelta Tappan, new genus 



Type species: Psamminopelta bowsheri Tappan, new 

 species. (Derivation: psamminos, Gr., of sand 4- pelte, 

 Gr., f., small, light shield; gender, feminine.) 



Test free, flattened, consisting of proloculus and 

 tubular, planispirally coiled chambers, each a half coil 

 in length, and only very slightly overlapping earlier 

 whorls; wall agglutinated with siliceous cement, insol- 

 uble in hydrochloric acid; aperture at the open end of 

 the tubular chamber, without a tooth. 



Remarks: Psamminopelta, new genus, differs from 

 Rzehakina Cushman in having chambers exactly half 

 a coil in length, so that the test is symmetrical about 

 the vertical axis rather than having a sigmoid vertical 

 axis. It differs from Spirolocammina Earland in having 

 a perfectly planispiral development, and lacking the 

 slightly sigmoid plan of chamber arrangement, as seen 

 in horizontal section. 



Miliammina Heron-AUen and Earland has a quinque- 

 loculine rather than planispiral development, and 

 Trilocularena Loeblich and Tappan is triloculine in 

 section. 



Psamminopelta bowsheri Tappan, new species 

 Plate 67, Figures 11-18, 22-24 



Test free, ovate in outline, flattened, consisting of 

 long, narrow and tubular planispiraUy arranged cham- 

 bers, each a half coil in length, and only very slightly 

 overlapping earlier coils; sutures depressed; wall finely 

 agglutinated, smoothly finished, with sihceous cement, 

 insoluble in acid, commonly crushed and flattened in 

 preservation; aperture at the open end of the tubular 

 chamber, commonly appearing elongate because of 

 compression of the test, without a tooth. 



