PLATE XL. 



PAGE 



Fig. 1. CBEPIPOBA? EPIDEKMATA Ulr 471 



1. Under surface of an example of medium size. 



1 a. Upper surface of a fragment showing arrangement of zooecia and 



maculie. Natural size. 

 1 6. Portion of la, x9, showing nearly direct apertures and slightly elevated 



lunarium. 



1 c. Lower portion of a vertical section from the basal plate up. x!8. 

 1 d. Upper portion of a vertical section, x!8, showing th^ serrated walls. 



1 e. Tangential section, x!8, showing the usual form of the zooaoia and the 



radially lined lunaria. 

 Cincinnati group, Wilmington, 111, 

 Illinois State Museum. 



Fig. 2. CBEPIPOBA IMPKESSA Ulr 471 



2. Natural size view of the type specimen. It is attached to a crinoid 



column or some other cylindrical body. 



2 a. Surface of same, x!2, showing the exceptionally developed lunaria and 



a portion af one of the large maculse. 

 Cincinnati group, Covington, Ky. 

 E. O. Ulrich's collection. 

 Pig. 3. CBEPIPOKA SIMULANS Ulr. (See also Pl.XXXIX.) 470 



3. Portion of a large encrusting example, showing distribution of the ele- 



vated macula; and zooccia. Natural size. 



3 a. Surface of same, xl2. 



Cincinnati group, Covington, Ky. 

 E. O. Ulrich's collection. 



Fig. 4. CBEPIPOKA SOLIDA Ulr 47:! 



4. Portion of a large expansion on the shell of a Cephalopod. Natural size. 



4 a. Surface of same x!2, showing one of the solid macula;. 



4 b. Tangential section of same x!8, showing the structure of one of the 



maculiE and the distinct lunaria. 

 Cincinnati group, Covington, Ky. 

 E. 0. Ulrich's collection. 



Fig. 5. CBEPIPOKA HEMISPH.ERICA Ulr 472 



5. Profile view of an example of the usual form. Natural size. 



5 a. Tangential section x!8, showing character of zooecia and lunaria, and 



one of the small maculae. 



5 b. Portion of a vertical section x!8, showing tabulation and irregular 

 structure of the walls. 

 Cincinnati group, Wilmington, III. 

 Illinois State Museum. 



