34 



UNITED STATES NATIONAL MUSEUM BULLETIN 215 



radial in structure, surface smooth to hispid or spinose, 

 the spines broken from the later chambers dtiring 

 preservation, but remaining visible on the earher 

 chambers when unfilled specimens are dissected; 

 primary aperture interiomarginal, umbilical in the 

 young stage, covered in the adult by an enveloping 

 final chamber, with two or more arched secondary 

 apertures at the lower margin of the final chamber, at 

 the contact with the sutures of the earher whorl. 



Remarks: Globigerapsis, new genus, differs from 

 Globigerinatheka Bronnimann in lacking the small 

 angular buUae covering the secondary apertures. It 

 differs from Globigerinoides Cushman in the absence of 

 an umbUical primary aperture in the adult. Globig- 

 erapsis does not show the multiple apertures on earlier 

 chambers as does Globigerinoides and Porticulasphaera, 

 new genus. 



Bronnimann (1952a, p. 27, text-fig. 3d-f) included a 

 single specimen of Globigerapsis kugleri with his Globig- 

 erinatheka barri, considering it to represent a stage 

 prior to the development of the sutural bullae. Al- 

 though the two genera may be closely related, they 

 have different geologic ranges, the present genus 

 beginning earlier. 



Globigerinoides semiinvoluta Keijzer also belongs to 

 the present genus and a hypotype (USNM P3937) from 

 the Eocene Navet formation. Hospital Hill marl, 

 Globigerapsis semiinvoluta zone type locality, San 

 Fernando, Trinidad, B. W. I., is here figured for 

 comparison. 



Bermudez (1949), p. 279, pi. 21, fig. 44) described as 

 Globigerina mexicana Cushman a specimen which 

 actually belongs to the present genus, and seems closer 

 to the species Globigerapsis semiinvoluta (Keijzer), 

 although it is perhaps a distinct species. 



Range : Middle to upper Eocene. 



Globigerapsis kugleri Bolli, Loeblich, and Tappan, new species 

 Plate 6, Figures 6a-c 



Test free, subglobular, early portion trochospiral with 

 globular chambers increasing rapidly in size as added, 

 about four to each whorl, final chamber considerably 

 larger and somewhat embracing, covering the umbUical 

 region of the early coil; sutures deeply depressed, com- 

 monly almost incised, radial to curved ; wall calcareous, 

 coarsely perforate, surface originally finely spinose, but 

 surface spines broken in fossilization, although those of 

 earlier chambers remain visible in dissected specimens, 

 or may be seen through the apertural openings of the 

 final chamber; aperture in the early stage interiomar- 

 ginal, umbilical, but this is covered in the adult by the 

 final embracing chamber, which has two to four arched 

 sutural secondary apertures, each bordered by a slight 

 hp, at the basal margin of the final chamber. 



Greatest diameter of holotype 0.44 mm., greatest 

 thickness 0.47 mm. Paratypes range from 0.36 to 0.47 

 mm. in greatest diameter. 



Remarks: Globigerapsis kugleri, new species, differs 

 from Globigerapsis semiinvoluta (Keijzer) in having 

 more inflated and nearly globular chambers, more 

 deeply incised sutures, a somewhat less embracing 

 final chamber and lower and less arched secondary 

 apertural openings. It is also similar in appearance to 

 Globigerinatheka barri Bronnimann but may have a less 

 embracing final chamber, and always lacks the small 

 bullae which cover the secondary sutural apertures of 

 Globigerinatheka. 



The specific name is in honor of Dr. H. G. Kugler, in 

 recognition of his work on the geology of Trinidad, 

 B. W. I. 



Types and occurrence: Holotype (USNM 

 No. P4220), unfigured paratypes (USNM P4221, 4222, 

 and 4827) from the Eocene Navet formation, Penitence 

 Hill marl, Globigerinatheka barri zone, from a block in 

 the Oligocene Nariva formation, Pointe-a-Pierre, Trin- 

 idad, B. W. I. 



Porticulasphaera Bolli, Loeblich, and Tappaa, new genus 



Type species: Globigerina mexicana Cushman, 1925. 

 (Derivation: Porticula, L., diminutive of porticus, an 

 arcade, series of axch.&s-\- sphaera, L., ball; gender, fem- 

 inine.) 



Test free, subglobular, early portion trochospiral, 

 final chamber much inflated to almost spherical, and 

 strongly enveloping, covering the umbilical region of 

 the early coil; sutures depressed, radial to curved; wall 

 calcareous, comparatively thick, coarsely perforate, 

 radial in structure, surface with numerous fine elongate 

 spines, broken from the exterior, but those of the early 

 portion may be preserved in the interior and visible in 

 dissected specimens; primary aperture in the early por- 

 tion interiomarginal, tmabUical, with secondary sutural 

 openings on the spiral side, as in Globigerinoides, the 

 umbilical aperture covered by the final enveloping 

 chamber of the adult, which has smaller sutural second- 

 ary apertures around its lower margin; these, together 

 with the secondary sutural apertures on the spiral side, 

 remain uncovered. 



Remarks: Porticulasphaera, new genus, resembles 

 Orbulina d'Orbigny in having a strongly embracing 

 final chamber, although less inflated. In Porticulas- 

 phaera the early coU always remains visible, and there 

 are no areal secondary apertures as in Orbulina. 



It resembles Globigerinoides Cushman in having the 

 multiple sutural secondary apertures in addition to the 

 large interiomarginal umbilical primary aperture in the 

 early portion, but differs in having the embracing final 

 chamber obscuring the primary umbilical aperture, the 

 adult possessing only the small sutural secondary open- 

 ings. 



Porticulasphaera, new genus, differs from Globigerap- 

 sis, new genus, in having the Globigerinoides-type of 

 secondary apertures on the spiral side in the early coil. 



Range: Middle Eocene. 



