FAMILY 24. NONIONIDAE 205 



more or less concentric grouping on the apertural face. 

 Carboniferous to Cretaceous ( ?) . 



Genus NONIONELLA Cushman, 1926 



Plate 27, figure 8; plate 28, figure 3 

 Genoholotype, Nonionella miocenica Cushman 



Nonionella Cushman, Contr. Cushman Lab. Foram. Res., vol. 2, 1926, 



p. 64. 

 Nonionina (part) of authors. 



Test subtrochoid, the dorsal side only partially involute, 

 ventral side completely so, close coiled ; chambers especially in 

 the adult inaequilateral, the ventral side developing a distinct 

 elongate lobe at the umbilical end, which covers the umbilicus 

 itself; wall calcareous, finely perforate; aperture at the base 

 of the apertural face of the chamber, low and elongate, extend- 

 ing from the peripheral border toward the ventral side. 



Cretaceous to Recent. 



Genus BRADYINA Moller, 1878 



Plate 27, figures .5-7; plate 28, figure 4 

 Genotype, by designation, Bradyina nautiliformis Moller 



Bradyina Moller, Mem. Acad. Imp. Sci. St. Petersbourg, ser. 7, vol. 



25, no. 9. 1878, p. 78. 

 Nonionina (part) Eichwald, 1860 (not d'Orbigny). 

 Litnola (part) H. B. Brady, 1876 (not Lamarck). 



Test mostly involute, bilaterally symmetrical at least in the 

 adult; aperture, a single opening or series of openings at the 

 base of the apertural chamber in the middle line with a supple- 

 mentary series in a crescentic line near the peripheral margin 

 of the. apertural face, connecting with the exterior after new 

 chambers are added by a row of pits along the sutural lines. 



Carboniferous. 



Genus ELPHIDIUM Montfort, 1808 



Plate 27, figures 9, 10; plate 28, figure 5 

 Genoholotype, Nautilus macellus Fichtel and Moll (part) 



Elphidmm Montfort, Conch. Syst., vol. 1, 1808, p. 15. 

 Geophomis Montfort, 1. c, p. 19 (genoholotype. Nautilus macellus 

 Fichtel and Moll (part)). 



