STUDIES IN FORAMINIFERA 



219 



Nanushukella umiatensis Tappan, new species 

 Plate 69, FiauBES 1-10 



Test free, trochoid, planoconvex, with a low rounded 

 spire of about 2% volutions, periphery rounded; 

 chambers increasing rapidly in size, semilunate in dorsal 

 view, about six in the early whorls and commonly 

 only four in the final whorl, last chamber occupying 

 about one-third of the ventral side; sutures distinct, 

 flush dorsally and may be somewhat limbate, ventraUy 

 depressed and nearly radial, with a slight forward 

 swing from the outer margin of the aperture to the 

 periphery; wall calcareous, coarsely perforate, surface 

 smooth; aperture ventral, a low arch at the umbilical 

 margin of the final chamber extending over much of the 

 length of its ventral margin, bordered above by a narrow 

 apertural flap that has a fimbriate margin, apertiu-es 

 of earlier chambers of the final whorl aU remaining 

 open and visible, radiating from the open umbilicus. 



Greatest diameter of holotype 0.29 mm., height 

 0.16 mm. Paratypes range from 0.18 to 0.34 mm. 

 in diameter. 



Eemaeks: This species differs from Conorhina conica 

 Lozo in having higher and less arcuate chambers as 

 seen dorsally, a lower, more rounded spire, less oblique 

 sutures, the characteristic umbilical aperture with 

 serrated lip, and the earlier apertures remaining open 

 with later development. 



It is found in the Grandstand, Topagoruk, and 

 Fortress Mountain formations. 



Types and occurrence: Holotype (USNM P4619), 

 figured paratype (USNM P4620), and unfigured para- 

 types (USNM P4621) from a core at 565-578 feet, 

 unfigured paratypes (USNM P4622) from a core at 

 206-211 feet, figured paratypes (USNM P4623a-c) 

 and unfigured paratypes (USNM P4624) from a core 

 at 238-256 feet, unfigured paratypes (USNM P4625) 

 from a core at 338-348 feet, figm-ed paratypes (USNM 

 P4626a,b) and unfigured paratypes (USNM P4627) 

 from a core at 348-358 feet, unfigured paratypes 

 (USNM P4628) from a core at 438-443 feet, figured 

 paratype (USNM P4629) and unfigiu-ed paratypes 

 (USNM P4630) from a core at 513-523 feet, and un- 

 figured paratypes (USNM P4631) from a core at 543- 

 545 feet, all from the Grandstand formation, Nanushuk 

 group ; unfigured paratype (USNM P4632) from a core 

 at 1,758-1,768 feet and unfigured paratype (USNM 

 P4633) from well cuttings at 1,990-2,000 feet, both in 

 the Topagoruk formation; all in Simpson test well 1, 

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

 Cape Simpson, northern Alaska. 



Unfigured paratype (USNM 106138) from well 

 cuttings at 1,560-1,570 feet, unfigiu-ed paratypes 

 (USNM 106137) from a core at 1,850-1,855 feet, 

 imfigured paratypes (USNM 106136 and P4634) from 

 well cuttings at 2,610-2,620 feet, from 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 P4635) from the For- 



396818—57 15 



tress Mountain formation (field sample 49 A Tr 611), 

 east of Castle Mountain, on the east fork of Torok 

 Creek, at lat. 68°33'35" N., long. 152°38'30" W., in 

 the southern foothills of the Brooks Range, northern 

 Alaska. Collected by I. L. Tailleur, 1949. 



Unfigured paratype (USNM P4636) from the middle 

 part of the Fortress Mountain formation (field sample 

 49A Pa 468), iK mUes southwest of Castle Moimtain, 

 along a tributary to Castle Creek, which flows north 

 to jom the Kiruktagiak River, at lat. 68°33'40" N., 

 long. 151°51' W., in the southern foothills of the 

 Brooks Range, northern Alaska. Collected by W. W. 

 Patton, Jr., 1949. 



Unfigured paratjrpe (USNM P4637) from seismo- 

 graph party 47 test hole, line 14A-48, shot hole 37, 

 at 190-200 feet, in the Grandstand formation, at lat. 

 71°17'54" N., long. 156°43'21" W., northern Alaska. 



Figiu-ed paratypes (USNM P4570a,b) and imfigured 

 parat5rpes (USNM P4571), all from the Cretaceous, 

 probably equivalent to the lower part of the Nanushuk 

 group of the eastern areas (field sample 47A Tm 10), 

 in a section of intermittent exposures along the Utukok 

 River, at lat. 69°07'30" N., long. 160°54' W., about 

 70 miles due east of Cape Beaufort in the northern 

 foothills of the Brooks Range, northern Alaska. Col- 

 lected by R. M. Thompson, 1947. 



Unfigured paratype (USNM P4572) from the lower 

 part of the Fortress Mountain formation (field sample 

 49 A Pa 81), on Fortress Creek, north of Fortress 

 Mountain, at lat. 69°35'25" N., long. 153°11' W., in 

 the southern foothills of the Brooks Range, Northern 

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



Genus Eponides Montfort, 1808 



Eponides morani Tappan, new species 



Plate 70, Figures 1-7 



Test free, trochoid, biconvex, periphery subacute, 

 all chambers of the iK to 2}^ whorls visible dorsally, 

 only the 6 to 8 chambers of the final whorl visible on 

 the umbilicate ventral side, chambers relatively nar- 

 row, extending backward at the periphery; sutures 

 distinct, thickened, flush dorsally, ventraUy nearly 

 radial although slightly curved; wall calcareous, 

 hyaline, relatively coarsely perforate, sm-face smooth; 

 aperture broad and low, a ventral, interiomarginal slit, 

 extending from the umbilical region almost to the 

 peripheral margin. 



Greatest diameter of holotype 0.47 mm., thickness 

 0.18 mm. Paratj^es range in diameter from 0.26 to 

 0.49 mm. 



Remarks: Eponides morani, new species, differs 

 from E. repandus (Fichtel and Moll) in being much 

 smaller, with a lower spire, in having 6 to 8 chambers 

 rather than 5 or 6 in the final whorl, in lacking a keel, 

 and in having a lower more slitlike aperture. 



The specimen selected as holot3T)e was obtained 

 from well cuttings, but it was selected as type because 

 it was the most complete and best preserved specimen 



