FAMILY 16. MILIOLIDAE 155 



Genus PYRGO Defrance, 1824 

 Plate 18, figures 11, 12; plate 19, figure 14 



Genoholotype, Pyrgo laevis Defrance 



Pyrgo Defrance, Diet. Sci. Nat., vol. 32, 1824, p. 273. 

 Miliola (part) LAMARCK, Ann. Mus., vol. 5, 1804, p. 351. 

 Biloculina d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 297 (genotype, by 

 designation, B. bulloides d'Orbigny). (Modeles, 1824?). 



Test with the early chambers at least in the microspheric form 

 quinqueloculine, followed by a triloculine series, and in the adult 

 added in planes 180° apart and involute, the interior simple, the 

 exterior of the test composed of but two chambers; aperture 

 typically with a broad bifid tooth. 



Lias to Recent. 



Genus FABULARIA Defrance, 1820 

 Plate 18, figures 13, 14; plate 19, figure 15 



Genoholotype, Fabularia discolithes Defrance 



Fabidaria Defrance, Diet. Sci. Nat., vol. 16, 1820, p. 103. 



Test similar to Pyrgo but the chambers labyrinthic and the 

 aperture cribrate. 



Eocene to Miocene. 



Dillina proposed by Munier-Chalmas and Schlumberger prob- 

 ably belongs here. 



Genus FLINTIA Schubert, 1911 

 Plate 53, figure 14 



Genoholotype, Spiroloculina robusta H. B. Brady 



Flintia Schubert, Abhandl. k. k. Geol. Reichs., vol. 20, pt. 4, 1011, p. 124. 

 Spiroloculina (part) of authors (not d'Orbigny). 



Test in the early stages completely involute like Biloculina, 

 only two chambers making up the exterior, later the chambers 

 not completely involute, not covering the early chambers at the 

 sides of the test and in the adult spiroloculine ; wall calcareous, 

 imperforate; aperture with a broad, flat tooth with curved ends. 



Tertiary and Recent. 



This genus while it resembles Svlroloculina in the adult has 

 evidently been derived from Biloculiyia by the development of 

 open coils as an adult character. 



