02 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xx 



Hem'qthragnKi irliltfii/di (James). 



(See also Plate IV, tijrs. 1-4; plate V, fig. o. ) 



Fig. 15. Tangential section, X 20, showing many of the zcxecia with sectidiis of the 

 semidiaphragms. 

 16. Vertical section, X 20, showing undulating walls in axial region, complete 

 diaphragms in outer part of same and semidiaphragms in tlie thick-walled 

 peripheral region. These incomplete diaphragms are distinctive of Hemi- 

 phragina. 



Economy member of the Eden shale, (.'incinnati, Ohio. 



Plate III. 



A iiiplexoponi tillosa ( D' Or] )igny ) . 



1. Tarrgential section, X 20, the upper half of figure showing the characters of 



the mature region, the lower half those of the immature zone. 



2. Tangential section through the mature region, X ''^^, exhibiting the numer- 



ous acanthopores and the dark line separating adjoining zocecia. 



3. Vertical section, X 12, showing two successive alternate pairs of immatm-e 



and mature zones and above these a longer immature zone. The figure 

 brings out the difference in wall structure and tabulation characterizing 

 the respective regions or zones. 



Sections prepared from the figured type of Moulicnlqwra subri/liiidriat. 

 James. 



Fairview formation, C'incinnati, Ohio. 



Stomatopora delicatnla (James). 



4 and 5. Portion of a zoarium X 12 and three zoo'cia, X 20, of the form to which 

 Miller applied the name S. provUinu. 



Belleview bed of the Fairview formation, Cincinnati, Ohio. 

 6. Portion of zoarium, X 12, showing variations in the length of zooecia. In 

 many specimens the general proportions of the zocecia in the lower half 

 of the figure is constant. 



Corryville bed of McMillan formation, Cincinnati, C)hio. 

 '7. Several zoa>cia, X 12, of the form named >S. feintissiina by Ulrich. 

 Economy member of Eden shale, Cincinnati, Ohio. 

 The specimens illustrated here were selected from the lot marked as 

 the types of his species by Mr. Jami's. 



Sti</inat('l.hi (hjcliei (James). 



8. Tangential sections, X 20, the upper and lower halves exhibiting the char- 



acters of the mature and immature regions, respectively. It should lie 

 remarked that the larger size of the zoax-ia in the upper half of the figure 

 is due to the fact that it includes a large part of one of the macuhc. 



9. Tangential section, X 50, showing minute structure of walls and acantho- 



pores. 

 10. Vertical section, X 12, passing through successive jiairs of iunnature and 

 mature zones. 



Sections prepared from James's figured tyi)e of the species. 



Mt. Auburn member of the McMillan formation, Lebanon, Ohio. 



