PLATE XLVIII 



PAGE 

 FigS. 1-4. MlCBABACIA MARYLANDICA Sp. UOV 755 



1. Calicular view of a typical specimen (X 4) from near Brightseat, 



Md. The interseptal loculi are filled with matrix which obscures 

 the grouping of the septa, and which cannot be removed without 

 injury to the specimen. Collection of the Maryland Geological 

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



2. Side view of the specimen shown in the preceding figure. X 8. The 



septal denticulations which are partly obscured by the matrix 

 have been partly restored by retouching. 



3. Interior view of a typical specimen (X 8) from near Brightseat, 



Md., showing the spongy columella, the synapticulae, tubercles, 

 and stri on the sides of the septa, and the intercostal synap- 

 ticula? and perforations of the base. 



4. View of the base of the type (X 8) showing the character and 



grouping of the costse. 



Figs. 5, 6. TBOCHOCYATHUS ? VAUGHANI sp. nov 752 



5. Side view of the type ( X 8) from near Brightseat, Md., showing the 



costae, tubercles, and broken edge of the wall, and the uncovered 

 edges of some of the septa. Collection of the Maryland Geo- 

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



6. Calicular view of the type (X 8), showing the arrangement of the 



septa and the spongy character of the columella. 



944 



