PLATE XIII. 



PAGE. 



FigS. 1 to 11. ESCHAROPORA CONFLUENS, n Sp 171 



1. A specimen that preserves the pointed articulating base; natural size. 



2. Well preserved fragment, the surface of which is enlarged in flg. 5. 



3. Portion of a large specimen with comparatively remote bifurcations and obscure monti- 



cules; natural size. 



4. Incomplete basal part of another large zoarium; natural size. 



5. Surface of the original of flg. 2, xg. The line above indicates the contour of the surface 



in a transverse section. 



6. Tangential section, xig, of a well preserved example. The figure embraces about two- 



thirds of the width of the branch, the right side being marginal. 



7. Several zooecia of the same section, x35, showing the mural lineation. 



8. Another portion of the same section, xi8, showing the prostrate part of the zooecia. 



9. Left half of another section, xis, prepared from a specimen in a less favorable (the usual) 



state of preservation. In this example the marginal zooecia were uncommonly large 

 10 and 11. Transverse and vertical sections xis. 



Middle third of the Trenton shales at Minneapolis. 



Figs. 12 and 13. ESCHAROPORA () LIMITARIS, n sp. or var 172 



12. A very large specimen, provisionally referred to this species; natural size. Middle 



third of the Trenton shales at Minneapolis. Survey Museum. Beg. No. 5930. 



13. A specimen of the average size of the species as it occurs in the lower third of the 



shales at Minneapolis. (For internal structure see figure 9 on page 172.) 



Figs. 14 to 17. PHJENOFORA TNCIPIENS, n. sp 174 



14. A fragmentof the natural size and a partof it xis. Trenton limestone, Montreal, Can. 



15. The basal part of a zoarium from the Trenton limestone at Chimney Point, Vermont. 



16. Tangential section, xis, of a specimen from Montreal. 



17. Tangential section of another specimen from Montreal, X28, showing structure imme- 



diately beneath the surface. 



Figs. 18 to 21. STICTOPORELLA EX.IGUA, n. sp.* 



18. Portion of the delicale zoarium of this species, natural size. 



19. Surf ace of one of the branches xig. 



20. Tangential section X28. 



21. Transverse section x is. 



Trenton limestone, Montreal, Can. * 



Figs. 22 to 26. PH^NOPORA WILMINGTONENSIS, n sp 175 



22. Fragmentary example of the natural size. 



23. Surface of same xg. 



24. Two portions of a tangential section, xis, the upper showing the appearance just 



beneath the surface, the lower just over the prostrate part of the zooecial tubes. 



25. One of the zocecia and portions of the adjoining ones X35 to show the minute structure 



of the walls. 



26. Vertical section, xis. 



"The description of this interesting species having unfortunately been omitted from its proper place in the text, the 

 following brief diagnosis of its peculiarities Is added here: 



Zoarium consisting of slender and frequently dividing branches, not exceeding 1.5 mm. in width; margins parallel, 

 scarcely sharp. Zooecial apertures oval, more or less oblique, arranged in eight or nine longitudinal rows, six or seven in 3 

 mm., between longitudinal ridges; diagonally three or four in! mm. TEnd interspaces two or three times as long as the 

 width of the space between the ridges, rsiing distally, usually with two elongate shallow pits or furrows. 



All that Is known of the interior is shown in the figures. 



The types were collected at Montreal, Canada, in the Trenton limestone, by Mr. T. C. Curry, for the Peter Kedpath 

 Museum, from which institution they were obtained by the author in exchange for other fossils. 



