PLATE XVI. 
Monotrypa osgoodensis n. sp. (Page 46.) 
Figs. 1 , 2. Portions of two vertical sections, X 20, exhibiting the tabulation and other 
characteristics of the immature and mature zones, respectively. 
3. Tangential section, X 20, passing through the mature region. 
Osgood beds, Osgood, Ind. 
4. Top and side views of a zoarium, natural size. 
5. Surface of a typical example, X 8. 
Rochester shale, Lockport, N. Y. 
Monotrypa benjamini n. sp. (Page 46.) 
[See also PI. XXVI, fig. 11.] 
6. Vertical section, X 20, showing the characteristic crenulations of the zocecial 
walls. 
7. A tangential section, X 20, passing through the immature region. 
8. A tangential section, X 20, cutting the mature region. Here the thickness of 
the walls has been somewhat increased by a secondary deposit. 
Rochester shale, Lockport, N. Y. 
9. A small portion of a vertical section, X 20, passing through the immature region] 
Osgood beds, Osgood, Ind. 
Monotrypa pediculata n. sp. (Page 47.) 
10, 11. Vertical and tangential sections, X 20, showing the internal structure 
12. Surface of one of the types, X 8. 
13. Two complete zoaria, natural size, showing the striated basal portion. 
Rochester shale, Rochester, N. Y. 
96 
