Plate 73. SIGMAVIRGULINA, EURYCHEILOSTOMA, SESTRONOPHORA, 

 SEJUNCTELLA, FAVOCASSIDULINA, PAROMALINA 



Page 

 Figures la-2. Sigmavirgulina tortuosa (Brady) 227 



la, Side view of hypotype (USNM P4857a), 

 showing flaring test and inflated base, large pores, 

 and marginal keel. lb, Edge view, showing 

 twisted test. Ic, Top view, showing slitlike 

 aperture and compressed test. 2, Basal view of 

 hypotype (USNM P48S7b), from which outer 

 wall has been etched to show early chamber 

 development. Two series of chambers can be 

 seen to diverge from the proloculus and spiral 

 upwards, so that the early plane of biseriality 

 assumes a sigmoid curve. From the Recent de- 

 posits of Fiji. All X 125. 

 Figures 3a-4c. Eurycheilostoma altispira Loeblich 229 

 and Tappan, new genus, new species 



3a, Spiral view of holotype (USNM P4882), 

 showing discorbine appearance. 3b, Umbilical 

 view, showing depressed center, broad low aperture 

 and apertural flap of the much overlapping final 

 chamber. 3c, Side view, showing extremely high 

 spire, suggesting the family Buliminidae. 4a, 

 Spiral view of paratype (USNM P4883). 4b, 

 Umbilical view. 4c, Edge view, showing a some- 

 what lower spired form. From the Goodland 

 formation (Albian), Lower Cretaceous of Texas. 

 X 22S. 

 Figures Sa-c. Sestronophora arnoldi Loeblich and 229 

 Tappan, new genus, new species 



5a, Spiral side of holotype (USNM P3130), 

 showing faintly sculptured surface and limbate 

 sutures. 5b, Umbilical view, showing perforated 

 umbilical plate, interiomarginal aperture and 

 small accessory pores in the umbilical side of the 

 final chamber. 5c, Edge view. From the 

 Pleistocene of California. X 25. 

 310 



Figure 6. Sejunctella earlandi Loeblich and Tappan, 228 

 new genus, new species 



6, Side view of holotype (USNM P3294), show- 

 ing fimbriate peripheral keel, and intercalary 

 plate between the whorls, composed of the keels 

 of earlier whorls with the addition of secondary 

 granular calcite. Recent, Faroe Islands. X 225. 



Figures 7-11. Favocassidulina favus (Brady) 230 



7, 10, 11, Edge views of topotypes (USNM 

 P3376a-c), showing honeycomblike surface, and 

 the smooth area surrounding the elongate, slit- 

 like aperture. 8, Sectioned hypotype (USNM 

 P4469), showing the alternating chambers typical 

 of the Cassidulinidae, beneath the secondary 

 covering of the wall. 9a, Side view of topotype 

 (USNM P3376d), showing exterior. 9b, Edge 

 view, showing aperture and slight lip. Figs. 7, 

 9-11, from the Recent Pacific, off the coast of 

 Chile, X 50; fig. 8, from the Recent Pacific, 

 off the Caroline Islands, X 55. 



Figures 12a-13. Paromalina bilateralis l^othVich. 3.nd 231 

 Tappan, new genus, new species 



12a, b, Opposite sides of holotype (USNM 

 P4883) from Albatross station D2262, showing 

 coarsely perforate peripheral margin, and ap- 

 parently imperforate sides, apertural face and 

 umbilical flaps. Supplementary openings can be 

 seen beneath the umbilical flaps. 12c, Edge 

 view, showing truncate periphery and interio- 

 marginal equatorial slitlike aperture. X 60. 

 13, Side view of paratype (USNM P3137) from 

 Goldseeker station 16. X 55. 

 All figures are camera lucida drawings by Lawrence and 

 Patricia Isham. 



