OF DENISON UNIVERSITY. 
37 
PLATE XIIL 
Fig. I. Phacops serraf us, n, sp : the head accidentally removed a little from 
the thorax in the rock. 
Fig. 2. Encrinurus Mitchelli, n. sp. part of the head missing. 
Fig. 3. Encrinurus Mitchelli, n. sp : a fragment, shovidng the large tubercles 
at the dorsal furrow of the head ; a typical specimen. 
Fig. Lichas Halli, n sp. 
Fig. Microdiscus punctatus Salter ; head, Museum Com. Zoology, Har- 
vard Univ. 
'Fig. 6. Sphcerexochus mirus, Beyrich ; a glabella and fixed cheek. 
Fig. 7. Encrinurus Bozvningi, n. sp. glabella and fixed cheeks. 
Fig. 8, Lichas Trentonensis, Conrad ; head, outline, Mus. Comp. Zool. 
Fig. 9. Cy athophy Hum p alula, n. sp ; a cross-section of unusually wrinkled 
form. 
Fig. 10. Cyathophylium patula, n. sp ; the lower side of two polyps. 
Fig. II. Cyathophylium patula, n. sp. \z. few lamellae enlarged. 
Fig. 12. Cyathophylium australe n. sp. the exterior of the calyces seen from a 
cast, partly restored. 
Fig. 13. Cyathophylium australe n. sp •, a cast. ^ 
Fig. T4. Cyathophylium australe n. sp', 2, few lamellae and grooves enlarged. 
Fig. 15. Cyathophylium Boloninense, Blainville ; a cross-section. 
Fig. 16. Endophyllum { sphongophylloides ? ) a cross-section. 
Fig. 17. Endophyllum ; the same, a vertical section. 
Fig. 18. Stromboides pygmceus, Rominger ; part of a corallum collected by 
Mr. John Van Cleve. 
Fig. 19. Encrinurus punctatus, Brtmswick ; a European specimen, figure taken 
from the wo^-k Fr. Schmidt, on East Baltic Silurian Trilobites. 
Fig. 20. Encrinurus Mitchelli, n. sp ; a moveable cheek. 
Fig. 21. Lichas breviceps, Llall, Waldron, Indiana, Mus. Comp. Zool. 
Fig. 22. Pleurodictyum problematicum, Goldfuss? View of base of casts, the 
epitheca being gone. 
ERRATA. 
Page 122, instead of Encrinurus Browningi E. Bowningi. 
Page 132, instead of Spongopylioids read Spongophylloides. 
