PLATE IX. 
Chilotrypa ostiolata (Hall). (Pago 24.) 
[See also PI. VIII, figs. 11-15.] 
Fig. 1. Surface of a typical example, X 20, showing portion of a macula and the snr 
rounding zooecia. 
2. A transverse section, X 20. 
3. Tangential section, X 20. 
4. A vertical section, X 20, illustrating the central canal, the peculiar bend of the 
zooecia in the immature region, and the vesiculose interspaces of the mature 
region. 
In figs. 2 and 4 the central canal is darkened in order to show it more clearly 
Rochester shale, Lockport, NL V. 
Meekopora foliacea ( Hall ). ( Pago 25. 
[See also PI VIII, figs. 5,6.] 
5,6. Tangential and vertical sections, respectively, X 20, showing the fisluli-poroid 
character and bifoliate growth of this species. 
Rochester shale, Lockport, N. Y. 
Cerwnoporella irregularis n. sp. (Page 21.) 
7. Tangential section, X 20, illustrating the prominent crescentic lunaria, rather 
numerous mesoporcs, and thin-walled zooecia. 
8. Vortical section, X 20, showing two layers of zooecia 
9. Surface of the type specimen, X 8. 
Rochester shale, Lockport, N. Y. 
Spatiopora maculata (Hall). (Pago 22.^ 
[See also PI. V 1 1 1 Egs. 1-4.] 
10. A tangential section of an old example, X 20. 
11. Surface of a loss mature example, X 8, in which the zooecia show the char act eria 
tic lineato arrangement. 
Waldron shale, Waldron, Ind. 
CeramoporeUa orbiculata (Ringuohorg). (Pago 20.) 
12. Vertical section, X 20. 
13. A tangential section, X 20, cutting the zoarium below the surface and showing the 
usual mesopores at this height. 
14. Surface of a typical example, X 8, showing a portion of a macula and the poly- 
gonal area marking out the zooecia in mature specimens. 
15. A portion of fig. 14, X 20. 
Rochester shale, Lockport, N. Y. 
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