FAMILY 12. FUSULINIDAE 131 



FAMILY 12. FUSULINIDAE 



I am greatly indebted to my friend, Professor Yoshiaki 

 Ozawa, for writing the part on this family and for choosing the 

 illustrations. 



Test bilaterally symmetrical, entirely involute; wall com- 

 posed essentially of two layers, imperforate median lamella on 

 the exterior and perforate mesh-structure on the interior; aper- 

 ture, a single elongate slit, or row of rounded openings, at the 

 basal margin of the apertural face. 



Subfamily 1. Fusulininae 



Test lenticular to fusiform ; wall and septa in primitive forms 

 with deposition or supplementary layers on both their sides and 

 mesh-structure obsolete; aperture single. 



Genus STAFFELLA Ozawa, 1925 



Plate 14, figure 1 

 Genoholotype, Fusulina sphaerica Abich 



Staffella Ozawa, Journ. Coll. Sci. Imp. Univ. Tokyo, vol. 45, art. 4, 192.5, 



p. 24. 

 Fusulina (part) Abich, Mem. Acad. Imp. Sci., St. Petersbourg, ser. 6, 



vol. 7, 1859, p. 418. 

 Fus)iIi7ieUa (part) Moller, 1. c, .ser. 7, vol. 25, no. 9, 1878, p. 114. 

 FuKidineUa Staff, Neues Jahrb., Beil. Bd. 27, 1909, p. 486 (not of 



Moller) . 



Test lenticular or spheroidal ; axis of the volutions making the 

 smaller diameter; wall composed of median lamella, mesh-struc- 

 ture and deposition layers, of which the mesh-structure is often 

 indistinct or obsolete, septa almost plane and pierced by a rela- 

 tively large, single buccal aperture. 



Carboniferous to Permian. 



Genus FUSULINELLA Moller, 1878 



Plate 14, figures 2, 3 

 Genotype, by designation, Fusulinella bocki Moller 



Fusulinella (part) Moller, Mem. Acad. Imp. Sci. St. Petersbourg, ser. 

 7, vol. 25, no. 9, 1878, p. 101. 



