PLATE XXXIX.* 



PAGE 



Fig. 1. CEBAMOPOBA IMBBICATA Hall 463 



1. Tangential section showing irregular mesopores, faint lunarium. and 



peculiar wall structure. x!8. 

 1 a. Portion of a vertical section, showing the cellulose basal layer, x!8. 



1 6. Tangential section to show the irregular structure of basal layer, x!8. 



Fig. z. CEBAMOPOBELLA? OHIOENSIS (Nicholson) 4U6 



2. Tangential section showing well marked lunarium, x!8. 



2 a. Vertical section, x 18, consisting of a complete layer, and a portion of 



another. 



Fig. 3. DIAMESOP BA VAUPELI Ulr. (See also PL XLI,) 468 



3. Vertical section, x!8. The two sides of the hollow stem have been 



brought close together 



3 6. About one-fourth of a transverse section, showing thickness of the 



zoarium, x!8. 



Fig. 3 a. DIAMESOPOBA COMMCNIS Ulr. (See also PL XLI.) 169 



Tangential section showing irregular wall structure, mesopores, and 

 lunaria, x!8. 



Fig. 4. CBEPIPOBA SIMULANS Ulr. (See also PI. XL.) 470 



4. Vertical section, passing through one of the macula 1 , x!8. 



4 a. Tangential section showing a macula and the peculiar lunarin, x!8. 



Fig. 5. CHILOPOBELLA FLABELLATA Ulr S81 



5. Tangential section showing minute structure as in figures 2 and So, x!8. 



5 a. Vertical section showing the long tubular zooeeia, x 18. 



5 6. Transverse section, x 18, showing the irregular, thin walled tubes of 



the axial region. 



These figures are introduced to complete the generic illustrations of the CEEAMO- 

 pOBLDjE, to which this plate is devoted. The species is rather common at the tops of 

 the hills at Cincinnati. Ohio. 



Fig. 6. CEBAMOPOBELLA DISTINCTA Ulr 464 



6. Tangential section, x!8, showing the characters of the genus. 



6 a. Vertical section, x!8, showing two complete layers growing in different 



directions. 



Cincinnati,;Ohlo. E. 0. Ulrich's collection. 



* The thin sections illustrated on this plate, the same as all the others figured on 

 the plates of this volume, were prepared by E. O. Ulrich, and are now in his collection. 



