STUDIES IN FORAMINIFERA 



33 



Test free, elongate ovate, early portion trochospiral, 

 the two or three much-embracing chambers of the final 

 whorl enveloping the early whorl, each with marginal 

 flanges extending out toward the opposing chambers 

 and partially obscuring the arched apertures; sutures 

 depressed, radial or ciu-ved; wall calcareous, perforate, 

 radial in structure, in the young stage the pores are ex- 

 tremely lai'ge and closely arranged, giving an almost 

 latticelLke appearance, the area between pores raised 

 and cancellated, in the later chambers a somewhat ir- 

 regularly fimbriate or scalloped flange, of clear shell 

 material and relatively poreless, is formed around the 

 chamber near its base and tends to coalesce laterally 

 and become much produced, the exterior surface of the 

 final chambers is smoother and glassy in appearance, 

 rather than hispid, and appears to be due to an external 

 secondary deposit ; primary aperture in the young stage 

 as in Globigerina, interiomarginal umbilical, in the adult 

 this is covered by the embracing final chamber, and 

 there may be one or more sutural secondary apertures 

 on opposite sides of the final chamber, but these may be 

 partially obscured by the overhanging chamber flanges 

 which paraUel the sutures, the chambers may be dis- 

 tinctly separated with a wide open area between the 

 flanges of opposing chambers, and there may be small 

 arched buUae crossing the sutural slit, and partially 

 covering the apertural regions, the walls of the bullae 

 more smoothly finished than that of the chamber, with 

 finer pores although of similar spacing. 



Remarks: Sphaeroidinella differs from Globigerina 

 d'Orbigny in having embracing later chambers which 

 cover the primary umbilical aperture, the chambers de- 

 veloping flanges paralleling the sutures and partially 

 obscuring the secondary apertures. There may also be 

 more than one secondary sutural aperture in the final 

 stage, and occasional specimens develop small bullae 

 over the sutural apertures. It resembles Glohigerin- 

 atheka Bronnimann in the enveloping final chamber, 

 sutm-al secondary apertures and bullae, but differs in 

 having the typical chamber flanges in the adult and the 

 final involute coiling obscuring the early coil. The 

 bullae, when present, are relatively smaU arches and do 

 not completely cover the secondary apertures. 



Types and occurrence: Lectotype of Sphaeroidina 

 dehiscens Parker and Jones, 1865 (here designated) 

 British Museima (Natural History) ZF 3580 and para- 

 types ZF 3579 from 1,080 fathoms, lat. 2° 20' N., long. 

 28° 44' W. Figured paratypes (from the type local- 

 ity) (USNM P4224). 



Figured hypotypes (USNM P4225) and imfigured 

 hypotypes (USNM P4226) from Challenger Station 224, 

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



Range: Miocene to Recent. 



Genus PuUeniatina Cushman, 1927 



Plate 4, Figures 3a-5 



PuUeniatina Cushman, Contr. Cushman Lab. Foram. Res., 

 vol. 3, p. 90, 1927. 



Type species: Pullenia ohliqueloevlata Parker and 



Jones, 1865. Fixed by original designation and mono- 



typy- 



Test free, globose, trochospiral to streptospiral, early 

 portion as in Globigerina, with open umbilicus, later 

 chambers completely enveloping the entire umbilical 

 side of the previous trochospiral coil, including the pre- 

 vious open umbilicus, and thus may even appear invo- 

 lutely coiled; wall calcareous, perforate, radial in struc- 

 ture, later part comparatively thickened, surface dis- 

 tinctly hispid in the Globigerina stage, as can be seen in 

 dissected tests, the surface in the adult smooth, although 

 the portion of the earlier whorl just below the apertiure 

 may show the hispid surface; aperture interiomarginal, 

 in the young a broad umbilical arch, as in Globigerina, 

 in the adult a broad low extraimibilical arch at the base 

 of the final enveloping chamber, bordered above by a 

 thickened lip, but not directly opening into the earlier 

 umbilicus, because of the streptospiral plan of growth. 



Remarks: PuUeniatina resembles Globigerina d'Or- 

 bigny in the early development, but differs in the later 

 streptospiral coiling and embracing final chamber and 

 in the characteristic extraumbilical peripheral aperture. 



PuUeniatina resembles Globigerapsis, new genus, in 

 having the Globigerina stage followed by a more em- 

 bracing final chamber, and in the change in coiling from 

 trochospiral to streptospiral, but PuUeniatina has a 

 single aperture, whereas Globigerapsis has in the final 

 chamber multiple apertures which are against the su- 

 tures of the early coil. 



Types and occurrence: Lectotype (here desig- 

 nated) of Pullenia obliqueloculata Parker and Jones, 

 1865 (the type species of PuUeniatina), British Museum 

 (Natural History) No. ZF 3583, and figured paratype 

 (USNM P4228) from Abrohlos Bank, at 260 fathoms, 

 lat. 22° 54' S., long. 40° 37' W., in the South Atlantic. 



Figured hypotypes (USNM P4229a, b) from Chal- 

 lenger Station 224, at 1,850 fathoms, lat. 7° 45' N., long. 

 144° 20' E., collected March 21, 1875. 



Range: Pliocene to Recent. 



Subfamily Orbulininae Schultze, 1854 



Type genus: Orbulina d'Orbigny, 1839. 



Coiling trochospiral to streptospiral, later stages en- 

 veloping or globular; chambers spherical to ovate; 

 primary aperture not visible in adult, secondary aper- 

 tm-es multiple and sutural or areal. 



Range: Middle Eocene to Recent. 



Globigerapsis Belli, Loeblich, and Tappan, new genus 



Plate 6, Figures 7a-c 



Type species: Globigerapsis kugleri Bolli, Loeblich 

 and Tappan, new species. (Derivation: Globus, L., a 

 globe or ball + gero, L., to bear or carry + apsis, L., 

 arch; gender, feminine.) 



Test free, subglobular; early portion trochospiral with 

 subglobular chambers, final chamber embracing and 

 covering the umbilical region of the early coil; sutures 

 depressed, radial to curved; wall calcareous, perforate. 



