PLATE XLIX 



PAGE 

 FigS. 1-4. MlCRABACIA ROTATILIS Sp. HOV 753 



1. Calicular view of the type (X 4) from near Brightseat, Md. The 



interseptal loculi are filled with matrix which cannot be re- 

 moved without injury to the specimen; the grouping of the septa 

 is therefore not clearly apparent. Collection of the Maryland 

 Geological Survey, on deposit in the U. S. National Museum. 



2. Side view of the type. X 8. The septal r'enticulations are partly 



obscured by the matrix and have been partly restored by re- 

 touching. 



3. Interior view of the type (X 8), which is broken nearly directly 



through the center, showing the spongy columella, the synap- 

 ticulse, tubercles, and striae of the sides of the septa, and the 

 intercostal synapticulae and perforations of the base. 



4. View of the base of the type ( X 8) from near Brightseat, Md., show- 



ing the character and grouping of the costae. 



945 



