PLATE XXXV. 



S. in/,. (DISCI S CAPSA. 



Page 209. 



Fig. I. A specimen retaining both valves of the carapace, and showing the characteristic features of the 



species. Enlarged to thr liameters. 



Fig. 2. Profile of the same, similarlj enlarged, showing the elevation of the beaks. The surface is s e- 



\vh:it less convex in this specimen than is usual. 



Hamilton group. Near Centerfield, Ontario county. 



Fig. 8. A somewhat smaller ami re convex carapace, the valves of which have 1 a very slightly 



displaced. Enlarged to three diameters. 

 Fig. 4. The internal surface of the same specimen, similarly enlarged 

 Hamilton group. Near Centerfield, Ontario county. 

 Fig. 5. The right valve of a carapace 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, tin' valves of whicli are folded ami slightly disph 1. tln> posterior extremity of 



the right valve being broken away. Enlarged to three diameters. 

 Hamilton group. Wear Centerfield, Ontario county. 

 Fig. 7. A very small carapace, natural size. 

 Fig. S. Th,' same, enlarged to three diameters. 



Hamilton group. Near Ceuti i-jhhl. Ontnrin founty. 

 Fig. 9. An individual of normal proportions, natural size. 



Hamilton group. Near Centerfield, Ontario county. 



ESTHERIA PULEX. 



Page 206. 

 Fig. 10. A fragment of -halo bearing several individuals of this species, and various Ostracoda of other 



' genera The position of the individuals of Estkeria are marked bj a cross (X). 

 Fig. 11. A portion of the same fragiridnt'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' Gully, Hopewell, Ontario county. 



Spathiocaris Emersoni. 



Page 199. 

 Fig. 12. A large individual which has been unsymmetrically folded along the dorsum. 



Portage group. Xii/ili*. Ontario county. 

 Fig. 13. Avery large example somewhat foreshortened in front, preserving normal convexity over the 

 anterior and lateral areas, but compressed along the dorsum ; showing the concentric lines ami 

 ridges and the fine radiating stria 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. 

 Fig. 15. The type specimen, showing the normal proportions of the species. 



Portage group. 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. IS. A young-example, showing the short carapace and verj broad anterior cleft. 



Portage group. Naples, Ontario county. 

 Fig. 19. Th. smallest carapace observed. 



Portage group. Naples, Ontario county. 



