204 FORAMINIFERA 



Genus NONION Montfort, 1808 



Plate 27, figures 1-3; plate 28, figure 1 

 Genoholotype, Nautilus incrassatus Fichtel and Moll 



Nonion Montfort, Conch. Syst., vol. 1, 1808, p. 211. 



Melonis Montfort, 1. c, p. 67 (genoholotype. Nautilus pompiloides 



Fichtel and Moll). 

 Florilus Montfort, 1. c, p. 135 (genoholotype. Nautilus asterizans 



Fichtel and Moll). . 

 Pulvinulus (part) Lamarck, 1816. 

 Placentula (part) Lamarck, 1822. 

 Cristellaria (part) Lamarck, 1822. 

 Lenticulina (part) Defrance, 1824 (not Lamarck). 

 Polystoviella (part) Defrance and authors (not Lamarck). 

 Nonionina d'Orbigny, Ann. Sci. Nat., vol. 7, 1826 (genotype, by designa- 

 tion, Nonioniyia umbilicata d'Orbigny). 



Test free, planispiral, more or less involute, bilaterally sym- 

 metrical, periphery broadly rounded to acute; chambers 

 numerous; wall finely perforate; aperture, an arched, usually 

 narrow opening between the base of the apertural face and the 

 preceding coil. 



Carboniferous (?) to Recent. 



Genus ORBIGNYNA Hagenow, 1842 



Plate 54, figure 5 

 Genoholotype, Orbignyna ovata Hagenow 

 Orhignyna Hagenow, Neues Jahrb. fiir Min., 1842, p. 573. 



Test planispiral, involute; chambers distinct, later ones with 

 the sides continuing back over the umbilical area; wall cal- 

 careous, finely perforate; aperture in the adult, rounded, in the 

 middle of the apertural face. 



Cretaceous of Europe and America. 



Genus CRIBROSPIRA Moller, 1878 



Plate 27, figure 4; plate 28, figure 2 

 Genoholotype, Cribrospira panderi Moller 



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

 25, no. 9, 1878, p. 86, 



Test mostly involute, bilaterally symmetrical at least in the 

 adult; aperture cribrate, the numerous rounded openings in a 



