30 



UNITED STATES NATIONAL MUSEUM BULLETIN 215 



the balsam-mounted specimen is of the same figm-ed by 

 Brady, but the apertural view in balsam is of a different 

 specimen on the same slide and not that figured by 

 Brady in this orientation. 



Original types of Globigerinella aequUateralis (Brady) 

 in the British Museum (Natural History), London. 

 Figured topotype (USNM P3918) and unfigured topo- 

 types (USNM P3211) from the Eecent at Challenger 

 Station 224, lat. 7° 45' N., long. 144° 20' E., at 1,850 

 fathoms. Collected March 21, 1875. 



Range : Middle Eocene to Recent. 



Clavigerinella Belli, Loeblich, and Tappan, new genus 



Type species: ClavigerineUa akersi, new species. 

 (Derivation: Claviger, L., club-bearing + ina + ella, 

 L. diminutives; gender, feminine.) 



Test free, planispiral, biumbilicate, involute, radially 

 lobulate in outline; chambers spherical in the early 

 stages, later becoming radially elongate or clavate; 

 sutures radial, depressed; wall calcareous, finely per- 

 forate, radial in structure, surface finely pitted; aperture 

 interiomarginal, equatorial, an elongate slit extending 

 up the apertural face, bordered laterally by wide 

 flanges which narrow toward the upper extremity of 

 the aperture, where they join to form a small lip. 



Remarks: Clavigerinella, new genus, resembles Has- 

 tigerinella Cushman in having early globular chambers 

 followed by later radial elongate and clavate chambers. 

 It differs in being planispiral instead of trochospiral, 

 and in having the distinctive equatorial apertiu-e 

 elongated in the plane of coiling and bordered laterally 

 by flanges. The aperture is reminiscent of that in 

 Hantkenina aragonensis Nuttall, but the present genus 

 does not have tubulospines, and Hantkenina may only 

 have radially elongate chambers which never become 

 clavate. 



Clavigerinella, new genus, differs from Hastigeri- 

 noides Bronnimann in having the distinctly elongate 

 slitlike equatorial aperture and wide bordering flanges 

 and in lacking, around the umbilical region, the sec- 

 ondary relict apertm-es which are the persistent lateral 

 margins of the earlier equatorial primary apertures. 

 As a rule, the chambers of Hastigerinoides are tapering 

 and those of ClavigerineUa are club-shaped. 



Range : Middle to upper Eocene. 



Clavigerinella akersi Bolli, Loeblich, and Tappan, new species 

 Plate 3, Figttees 5a, b 



Test free, planispiral, biumbilicate, involute, lobulate 

 in outline; early chambers spherical, later chambers 

 radial elongate and typically much inflated at the 

 extremity, with foiu- chambers in the final whorl; 

 sutiu-es radial, distinct and depressed; wall calcareous, 

 distinctly perforate, surface finely pitted; apertm-e 

 interiomarginal, equatorial, an elongate sht extending 

 up the apertural face for about half the length of the 

 final chamber, aperture bordered laterally by wide 

 flanges which are flared at the base and become pro- 



gressively narrower toward the upper extremity of the 

 aperture, joining at the top to form a narrow lip, a 

 short distance below the bulbous or clavate extreme of 

 the chamber. 



Greatest diameter of holotype 0.86 mm., greatest 

 thickness 0.23 mm. Paratypes range from 0.49 to 0.73 

 mm. in greatest diameter. 



Remarks: This species differs from Hastigerinella 

 eocanica Nuttall var. aragonensis Nuttal from the 

 Eocene of M&ico, in having the terminally clavate 

 chambers, with their nearly spherical inflations, and in 

 having only foiu- chambers per whorl. The Mexican 

 species has narrower, more elongate cylindrical cham- 

 bers and may have four or five chambers per whorl, 

 but also belongs to the present genus. 



The species is named in honor of W. H. Akers, 

 paleontologist with The California Company, in recog- 

 nition of his work on the planktonic Foraminif era of the 

 Gulf Coast. 



Types and occurrence: Holotype (USNM P4550) 

 and imfigured paratypes (USNM P4551) from the 

 Eocene Navet formation, equivalent in age to the 

 Friendship Quarry marl and Dunmore Hfll marl (middle 

 Eocene) in Spring Branch of the Navet River, 1,100 

 feet south of the 12.5 mUepost of the Brasso-Tamana 

 Road, Central Range, Trinidad, B. W. I. Collected 

 by Dr. Hans Kugler, sample K.8820. 



Cassigerinellinae Bolli, Loeblich, and Tappan, 

 new subfamily 



Type genus: Cassigerinella Pokorn^, 1955. 



Coiling of test planispiral in the early stage, becom- 

 ing enrolled biserial in the later stage; chambers 

 spherical to ovate; primary aperture equatorial in 

 neanic stage, extraumbilical and alternating in the 

 adult. 



Range : Oligocene to Miocene. 



G«nus Cassigerinella Pokorny, 1955 



PliATB 3, FiGTIEES 6a-C 



Cassigerinella PoKOBNf, VSstntk tjstrednfho tjstavu Geolo- 

 gickao, vol. 30, p. 136, 1955. 



Type species: Cassigerinella boudecensis Pokom;^', 

 1955. Fixed by original designation. 



Test free, robust, early portion planispiral and similar 

 to Hastigerina, later with biserially arranged chambers 

 continuing to spiral in the same plane, biumbilicate, 

 periphery broadly rounded; chambers globular to ovate 

 and only a few pairs arranged as in Cassidulina to each 

 whorl of the test; sut\u-es distinct, depressed, radial to 

 curved; wall calcareous, perforate, radial in structure, 

 surface smooth to pitted; aperture interiomarginal, an 

 extraumbilical arch alternating in position from one 

 side to the next in successive chambers. 



Remarks: Cassigerinella differs from Hastigerina 

 Thomson in having the adult spire composed of bi- 

 serially arranged chambers. Biglobigerinella Lalicker 



