24 



UNITED STATES NATIONAL MUSEUM BULLETIN 215 



Johnson County, Texas. Collected 1940 by H. T. and 

 A. R. Loeblich, Jr. 



Figured hypotype (USNM P5394) from a 1-foot 

 sample of grayish clay in the upper Paw Paw formation, 

 7K feet below the contact with the overlying Main 

 Street formation, on the south side of the road at the 

 western edge of the Federal Narcotic Farm, southeast 

 of Fort Worth, locality HTL-55, Tarrant County, 

 Texas. Collected 1939 by H. T. and A. R. Loebhch, Jr. 



Range : Aptian to Maestrichtian. 



Planomalina caseyi Bolli, Loeblich, and Tappan, new species 

 Plate 1, Figures 4a-5b 



Test free, planispiral, biumbilicate, involute to 

 partially evolute, lobulate in outline; chambers spheri- 

 cal to ovate, 7 to 9 in the final whorl, early ones closely 

 coiled, later ones with a tendency to become evolute in 

 some specimens, sutures radial, gently curved, mod- 

 erately depressed; wall calcareous, finely perforate, 

 siu-face smooth; aperture iateriomarginal, a broad low 

 equatorial arch, with lateral extensions reaching back 

 on the umbilical margin of the chamber to the septum 

 at the base of the chamber, the lateral slitUke extensions 

 bordered above by a distinctly upturned lip, the 

 umbilical portions of the apertures of successive cham- 

 bers remaining open as relict supplementary apertures 

 beneath the hps after later chambers have covered the 

 primary apertures. 



Greatest diameter of holotype 0.31 mm., thickness 

 0.13 mm. Paratypes range in diameter from 0.18 to 

 0.39 mm. 



Remaeks: Planomalina caseyi, new species, differs 

 from Planomalina apsidostroba Loeblich and Tappan in 

 having more globular and inflated chambers, a smooth 

 rather than carinate periphery and depressed rather 

 than limbate, elevated and beaded sutures. Planoma- 

 lina caseyi is a more primitive form, occmriag in some- 

 what older beds, ui the Duck Creek formation of Texas 

 and Oklahoma (mid-Albian) and in the Gault (Albian) 

 of England, whereas the more ornate P. apsidostroba is 

 found in the Weno, Paw Paw, and Main Street forma- 

 tions (upper Albian) of Texas. 



It differs from Biglobigerinella barri, new species, in 

 being about one-half as large, in having fewer and more 

 inflated chambers, in lacking the rugose periphery, and 

 in always having a single primary peripheral aperture, 

 with no development of paired apertm-es or paired 

 chambers. 



The specific name is in honor of Mr. Raymond Casey, 

 Geological Siu-vey of Great Britain, in recognition of 

 his outstanding work on the Lower Cretaceous am- 

 monites and pelecypods and on the stratigraphy of 

 Great Britain. 



Types and occurrence: Holotype (USNM P4869), 

 figured paratype (USNM P4870) and unfigured para- 

 types (USNM P4871 and P4872) from the Albian Gault 

 clay, Brick pit of the London Brick Co., Arlesey, 

 England. Collected 1953 by H. T. and A. R. Loeblich, 

 Jr. 



Unfigured paratypes (USNM P5396) from 5K feet of 

 section, alternating gray shale and marly limestone, 58 

 feet above the base of the Duck Creek formation, and 

 GYi feet below the fucoid-bearing basal limestone of the 

 Fort Worth formation. Lower Cretaceous, Albian, on 

 the west bank of the Red River, in the SWKSec.22,T.8- 

 S.,R.2E., on the southwest side of Horseshoe Bend, 

 locality HTL-13, Love County, Oklahoma. Collected 

 August 1939 by H. T. and A. R. Loeblich, Jr. 



Unfigured paratypes (USNM P5395) from the top 6 

 feet exposed in the excavation for the Denison Dam, 

 alternating thin limes and yeUow brown clays of the 

 Duck Creek formation, 45 feet above the base, north of 

 Denison, Grayson County, Texas. This excavation 

 at the site of the dam for Lake Texhoma is now covered 

 and grassed over. Locality HTL-104, collected July, 

 1940 by H. T. and A. R. Loeblich, Jr., sample 462^63. 



Genus Hastigerinoides Brotmiinann, 1952 



Plate 1, Figtjees 6a-10b 



Hastigerinoides Bronnimann, Bull. Amer. Paleontol., vol. 

 34, No. 140, p. 52, 1952. 



Type Species: Hastigerinella alexanderi Cushman, 

 1931. Fixed by original designation. 



Test free, stellate in appearance, planispiral, biiunbUi- 

 cate, periphery rounded; early chambers globular, later 

 chambers elongate-radial, much produced and tapering 

 or clavate; sutm-es depressed, radial; wall calcareous, 

 perforate, radial in structure, surface smooth, pitted or 

 finely hispid; primary aperture interiomarginal, equa- 

 torial, a simple arch bordered above by a protruding lip, 

 with rehct secondary apertiu-es around the umbilical 

 region, representing the umbilical portion of previous 

 apertures, which may remain open or be closed. 



Remarks: Bronnimann (1952b, p. 53) stated: "The 

 difference in the shape of the adult chambers is consid- 

 ered to justify the splitting of the genus Hastigerinella 

 Cushman into Hastigerinella s.s., with club-shaped adult 

 chambers, and Hastigerinoides n. subgen. with pointed 

 adult chambers." 



Topotype specimens of Hastigerinella alexanderi Cush- 

 man show occasional club-shaped as well as pointed 

 chambers on a single specimen. Therefore, the cham- 

 ber shape alone cannot be considered, in this case, a 

 valid separation for genera or subgenera. However, a 

 more important generic character is the type of coiling. 

 The type species of Hastigerinella, and therefore of the 

 genus, strictly considered, is trochospiral in develop- 

 ment, whereas in Hastigerinoides the coiling is plani- 

 spiral. The aperture of Hastigerinella is broad and 

 extraimibilical-umbUical, in the later stages extending 

 farther towards the periphery and even onto the spiral 

 side, but is not a typically equatorial apertm^e as is the 

 primary aperture of Hastigerinoides. The relict second- 

 ary apertures also are found only in the latter genus. 

 These differences in coiling and apertural characters are 

 considered a valid basis for elevating Hastigerinoides to 

 generic rank. 



