338 FORAMINIFERA 



to those of Orbitoides. Embryonic apparatus large, exceeding 

 2 mm. in diameter, roughly ovoid in form, and enclosed in a 

 thick, porous shell, within which there are many chambers, 

 piled one on another without any definite order. Otherwise 

 the genus resembles Orbitoides, to which it is similar in its 

 equatorial and lateral chambers and its pillars. 



Maestrichtian. 



H. Douville thinks that Simplorbites may not be a valid 

 genus, and that the peculiar embryonic chambers may be due 

 to "gigantisme" in specimens actually referable to Orbitoides 

 apiculatus. If this opinion should be correct, the species would 

 be O. gensacicus (Leymerie), 1851, and not O. apiculatus 

 Schlumberger, 1901. 



Genus LEPIDORBITOIDES Silvestri, 1907 



Plate 56, fibres 9, 10; plate 58, figures 8-10 

 Genoholotype, Orbifolites sociulis Leymerie 

 Lepidorbitoidea SiLVESTRl, Atti Acad. Nuovi Lincei, an. 61, 1908, p. 23 



(15 Dee., 1907). 

 Lepidorhitoides H. Douville, Bull. Soc. Geol. France, 4th ser., vol. 20, 

 1920, p. 220, figs. 22-24. 



EXPLANATION OF PLATE 56 



Fig. 



1. Discocyclina ( Aster ocyclina) georgiana (Cushman). X 6. Ex- 



terior. 



2. Discocyclina ( Discocyclina) floridanu (Cushman). x 6. Exterior. 



3. Miogypsina. Diagrammatic figure to show^ structure. (After Van 



der Vlerk and Umbgrove). 

 4-6. Omphalocychis macroporus (Lamarck). X 2. (After H. Douville). 

 Fig. 4, Horizontal weathered section. Figs. 5, 6, Peripheral 

 views. 



7. Discocyclina. Diagrammatic figure to show structure. (After 



Van der Vlerk and Umbgrove). 



8. Miogypsina cushmavi Yaughan. X 16. (After Vaughan) . Hori- 



zontal section to show embryonic and meridional chambers. 

 9, 10. Lepidorhitoides socialis (Leymerie). X 80. (After H. Douville). 

 Fig. 9, Portion of vertical section. Fig. 10, Portion of hori- 

 zontal section. 

 11. Lepidocyclimi. Diagrammatic figure to show structure. (After 

 Van der Vlerk and Umbgrove). 



