PLATE XXVI. 
Eridotrypa simttis n. sp. (Page 31.) 
[See also PI. XII, figs. 10-14.] 
Figs. 1,2. Two nearly complete zoaria, X 1.3. 
Rochester shale, Grimsby, Ontario. 
Callopora magnopora Foerste. (Page 42.) 
[See ais.. Pi. XV, figs. 1-8.] 
3. Fragment of a zoarium, X 1-3. showing the thickness of the branch. 
Rochester shale, Grimsby, Ontario. 
Lioclema explanatum n. sp. (Page 33.) 
[See also PI. XIII, figs. 8-10.] 
4. Basal view of a complete zoarium, X 1.3, showing the undulating epitheca. 
Rochester shale, Rochester, N. Y. 
Ptiloporella nervata (Nicholson). (Page' 51.) 
[See also PI. XXIV, figs. 24, 25.] 
5, 6. Noncelluliferous and celiuliferous faces of two zoaria, X 1.3, exhibiting tin 
prominent primary branches. 
Rochester shale, Grimsby, Ontario. 
Lichenalia concentnea Hall. (Page 61.) 
[See also Pi. XXII, figs. 1-6.] 
7,8. Views of two young examples, natural size, showing the subcircular lamina 
zocecia. 
9. A portion of a zoarium, natural size, exhibiting the characteristic conccntri 
undulations of the epitheca. 
10. A portion of the epithecated side, enlarged. 
(Figs. 7 to 10 alter Hall, Nat. Hist. New York, Pal. II, 1852, pi. 40E.) 
Rochester shale, Lockport, N. Y. 
Monotrypa benjarnim n. sp. (Page 46.) 
[See also Pi. XVI, figs. 6-9.J 
11. A zoarium, X 3, split through its length to show the characteristic crenulatec 
zooecial walls. 
Rochester shale, Rochester, N. Y. 
Callopora elegantula Hall. (Page 41.) 
[See also PI. XVII, figs. 11-15.] 
12. Fragment of a zoarium, X 3, exhibiting the usual arrangement of zocecia an( 
mesopores. Many of the zocecia are closed by opercula. 
Rochester shale, Rochester, N. Y. 
124 
