PLATE ITT. 
View of a slab, X 1.4, showing assemblage of species. 
Rochester shale, Middleport, N. Y. 
All of the species recognized on this slab are designated by numbers, but the duplicate 
specimens, of which there a:e many, are left unnumbered. In spite of the numerous 
species showing upon this specimen, some of the most common forms, such as Trematopora 
tuberculosa, Pachydictya crassa, Phylloporina asperato-striata, etc., are unrepresented. 
Following is the list of species with their corresponding numbers: 
1. Pseudohornera diffusa (Hall). 
2. Diamesopora dichotoma (Hall). 
3. Lioclemella maccombi n. sp. 
4. Chilotrypa ostiolata (Hall). 
5. Semicoscinium tenuiceps (Hall). 
0. Bythopora spinulosa (Hall). 
7. Callopora elegantula Hall. 
8. Fenestella cribrosa Hall. 
9. Polypora incepta Hall. 
10. Phaenopora ensiformis Hall. 
11. Thamniscus dichotomus (Hall). 
12. Pseudohornera niagarensis (Hall). 
13. Stictotrypa punctipora (Hall). 
14. Acanthoclema asperum (Hall). 
15. Fenestella elegans Hall. 
10. Idiotry pa punctata (Hall). 
70 
17. Lioclema asperum (Hall). 
18. Diploclema sparsum (Hall). 
19. CoUoclema cavernosa n. sp. 
20. Loculipora ulrichi n. sp. 
21. Tseniodictya schucherti n. sp. 
22. Allonema waldronense Ulrich and Bassler. 
23. Stigmatella globata n. sp. 
24. Nematopora minuta (Hall). 
25. Trematopora spiculata Hall. 
20. Endotrypa striata (Hall). 
27. Ceramoporella orbiculata (Ringueberg). 
28. Fistulipora crustula n. sp. 
29. Diploclema sparsum argutum n. var. 
30. Ptiloporella nervata (Nicholson). 
31. Batostomella granuhlera (Hall). 
32. Lioclema multiporum n. sp. 
