PLATE XXXV. 
SCHIZODISCUS CAPSA. 
Page 209. 
Fig. 1. A specimen retaining both valves of the carajiace, and showing the characteristic features of the 
species. Enlarged to three diameters. 
Fig. 2. Profile of the same, similarly enlarged, showing the elevation of the beaks. The surface is some¬ 
what less convex in this specimen than is iisual. 
Hamilton group. Near Centerfield, Ontario county. 
Fig. 3. A somewhat smaller and more convex carapace, the valves of which have been very slightly 
displaced. Enlarged to three diameters. 
Fig. 4. The internal surface of the same specimen, similarly enlarged. 
Hamilton group. Near Center-field, Ontario county. 
Fig. 5. The i-ight valve of a cai-apace which is much narrower at the posterior extremity than is usual. 
Enlarged to three diameters. 
Hamilton group. Near Centerfield, Ontario county. 
Fig. 6. A small example, the valves of which are folded and slightly displaced, the posterior extremity of 
the right valve being broken away. Enlarged to three diameters. 
Hamilton group. Near Centerfield, Ontario county. 
Fig. 7. A very small carapace, natural size. 
Fig. 8. The same, enlarged to three diameters. 
Hamilton group. Near Centerjield, Ontario county. 
Fig. 9. An individual of normal proportions, natural size. 
Hamilton group. Near Centerfield, Ontario county. 
Estheria pulex. 
Page 206. 
Fig. 10. A fragment of shale bearing several individuals of this species, and various Osteacoda of other 
genei-a. The position of the individuals of Estheria ai-e marked by a cross (X). 
Fig. 11. A portion of the same fragment enlarged to twenty-five diameters, showing five valves of Estheria, 
the distances between which have been proportionally much diminished in the enlargement. 
Hamilton group. Miles' Chilly, Hopewell, Ontario county. 
Spathiocaris Emersoni. 
Page 199. 
Fig. 12. A large individual which has been unsymmetrically folded along the dorsum. 
Portage group. Naples, Ontario county. 
Fig. 13. A very large example somewhat foreshortened in front, pi'eserving normal convexity over the 
anterior and lateral areas, but compressed along the dorsum ; showing the concentric lines and 
ridges and the fine radiating striae upon the dorsum. 
Portage group. Naples, Ontario county. 
Fig. 14. A carapace which is symmetrically folded along the dorsum, showing the elevation of the apex 
and the relative length of the anterior cleft. 
Portage group. Naples, Ontario county. 
Pig. 15. The type specimen, showing the normal proportions of the species. 
Portage gi-oup. Naples, Ontario county. 
Fig. 16. A small, somewhat distorted example. 
Portage group. Naples, Ontario county. 
Fig. 17. An individual of about the same size as that represented in the preceding figure, but uncompressed. 
Portage group. Sparta, Livingston county. 
Fig. 18. A young example, showing the short carapace and very broad anterior cleft. 
Portage group. Naples, Ontario county. 
Fig. 19. The smallest carapace observed. 
Portage group. Naples, Ontano county. 
