FORAMINIFERA. 1 1 



VII. Anomalina d'Orbigny. 

 VIII. Truncatulina d'Orbigny. 

 Nautiliform or trochiform shells, the first nearly uniformly coiled, 

 the second flat on one side, while on the other side the last volution 

 covers most of the preceding ones. Carbonic-Recent, 

 ii. A. ammonoides (Reuss). (Fig. 15.) Cret.-Recent ; 12. T. 

 lobatula (Walk. & Jacob) (Fig. 16) Carb.-Recent. 



IX. Endothyra Phillips. 



Free, calcareous, irregularly spiral. Chambers numerous. 

 General aperture porous. 



Abundant in Carbonic and continuing doubtfully to Recent. 

 13. E. baileyi Hall. (Fig. 17.) Lower Carbonic. 



Fig. 18. Fusulina secalica (Ind. Geol. Fig. 19. Orbitoides manielli. Outline and 

 Surv. ), natural size and enlarged. enlargement of peripheral portion. 



Shell compressed, usually consisting of two or three oblique 

 convolutions of which little more than the last is visible on the 

 exterior. Margin thick, rounded, lobulate. Chambers inflated, 

 separated by depressed septal lines, variable in number from seven 

 to ten in each whorl. Diameter J-g- to 2V mcn or more. 



Very abundant in Mississippian of southern Indiana. 



X. Calcisph^ra Williamson. 

 Free, consisting of two thin-walled concentric chambers with 

 terminal apertures. Inner chamber smooth with tubular prolon- 

 gations at the ends. Outer chamber spirally marked. Texture 

 arenaceous compact. Resembles organs of fructification of Cham 

 with which it has been identified. Devonic-? 



14. C. robusta Williamson. Dev.-Carb. 



Shell nearly globular, about 1 mm. in diameter, with polar aper- 

 tures. Wall composed of minute calcareous grains, smooth in- 

 teriorly. Outside banded by nine strongly defined regular spiral 

 ridges. 



Onondaga limestone of Indiana, Kentucky and Ohio. 



