FORAMINIFERA OF THE ATLANTIC OCEAN 31 



wall calcareous, perforate; aperture narrow, at the base of the aper- 

 tural face. 



Carboniferous. 



Genus CAMERINA Brugiere, 1792 



Camerina Brtjgi6re, Ency. Method., "Vers," pt. 1, 1792, p. 395. — Cushman, 

 Special Publ. No. 1, Cushman Lab. Foram. Res., 1928, p. 210. 



Nautilus (part) of Authors. 



Phacites Blumenbach, Abbild. Nat. Gegenstande, heft 4, no. 40, 1799, pi. 40 

 (genoholotype, Phacitef! fossilis Blumenbach) . 



Nummuliies Lamarck, Syst. Auim. sans Vert., vol. 9, 1801, p. 101 (genoho- 

 lotype, Camerina laevigata Brugiere). 



Lenticulina Lamarck (part), Ann. Mus., Paris, vol. 5, 1804, p. 186. 



Nummulites Montfort, Conch. Syst., vol. 1, 1808, p. 155 (genoholotype, 

 Nummuliiies denarius Montfort). 



Lycophris Montfort, Conch Syst., vol. 1, 1808, p. 159 (genoholotype, Nautilus 

 lenticularis Fichtel and Moll (part)). 



Egeon Montfort, Conch Syst., vol. 1, 1808, p. 167 (genoholotype, Nautilus 

 lenticularis Fichtel and Moll (part)). 



Nummulina d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 295 (genotype, by 

 designation, Camerina laevigata Brugiere). 



Nummularia Sowerby, Min. Conch., vol. 6, 1826, p. 76 (genotype, by desig- 

 nation, Camerina laevigata Brugiere) , 



Amphistegina (part), Reuss, 1855. 



Genotype, by designation, — Camerina laevigata Brugiere. 



Test lenticular, planispLral, bilaterally symmetrical, involute; wall 

 perforate, calcareous, with a secondary skeleton and complicated 

 canal system; aperture simple at the base of the apertural face, 

 median. 



Carboniferous (?) to Oligocene. 



There are many subgeneric names for this and the following not 



given here. 



Genus ASSILINA d'Orbigny, 1826 



Assilina d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 296 (as a subgenus of 

 Nummulina). — Cushman, Special Publ. No. 1, Cushman Lab. Foram. Res., 

 1928, p. 212. 



Nummulites (part) of Authors. 



Genotype, by designation, — Assilina discoidalis d'Orbigny. 



Test similar to Camerina but the test flattened, the chambers usually 



not completely involute so that the earlier coUs are not covered, or 



with the wall very thin so that the earlier coUs are visible from the 



exterior. 



Eocene. 



Genus OPERCULINELLA Yabe, 1918 



Operculinella Yabe, Sci. Rep. Tohoku Imp. Univ., ser. 2, (GeoL), vol. 4, 

 1918, p. 122. — Cushman, Special Publ. No. 1, Cushman Lab. Foram. Res., 

 1928, p. 212. 



Amphistegina W. B. Carpenter, 1859, (not d'Orbigny). 



Nummuliies H. B. Brady, 1884 (not Lamarck). 



