PLATE XXII— Continual. 

 Fig. is. A large pygidium. 



Fig. 1.9. Profile of the same. 



Schoharie grit. Pendleton, Indiana. 



Proetus grassimarginatus. 



Page 99. 

 See Plates 20 and 25. 

 Fig. 20. A small pygidium, retaining the thickened border. 



Schoharie grit. Near Clarksville, Albany county. 

 Fig. 21. A pygidium, preserved as a cast of the internal surface and showing the; annulations with. unusual 

 distinctness. 



Schoharie grit. Near Clarksville, Albany county. 

 Fig. 22. A fragmentary individual of large size, preserved as a cast of the internal surface. 

 Upper Helderberg limestones. Cayuga, Province of Ontario. 



Fig. 'J:i. Profile view of a small pygidium, showing an abnormal prominence of the extremity of the axis. 



Corniferous limestone. Falls of the Ohio. 

 Fig. "J4. Profile view of an enrolled individual, from which most of the crust has been removed. 

 Fig. 25. Anterior view of the same specimen, showing the internal easts of the glabellar furrows, through 

 the partially removed crust. 



Corniferous limestone. Sandusky, Ohio. 

 Fig. 26. A normal pygidium. 



Corniferous limestone. Williamsuille, Brie county. 



PROETUS STEN< )1'VGE. 

 Page ISO. 

 Fig. 27. A pygidium, showing the short, broad, convex and obtuse axis. Enlarged to three diameters. 

 Corniferous limestone. Phelps f Ontario county. 



Proetus CLAKUS. 



Page 104. 

 See Plate 20. 

 Fig. 28. An internal east of the glabella, showing the lateral furrows. 



Upper Helderberg limestone. De Cewville, Province of Ontario. 

 Fig. 29. An entire individual, somewhat flattened, but showing the characters of the species. 



Corniferous limestone. Lime Hock, Genesee county. 

 Fig. ;-io. An imperfect pygidium. 



Corniferous limestone. Falls of the Ohio. 



Proetus ovifrons. 



Page 110. 

 Fig. 31. An internal east of the glabella, showing its form and convexity, the size of the basal lobes, and 

 the recurved frontal border. Enlarged to three diameters. 



Corniferous limestone. Canandaigua, Ontario county. 

 Fig. I!2. A glabella, preserving the dorsal surface and showing the pustulose character of the crust. Eu- 

 [arged to three diameters. 



Corniferous limestone. Canandaigua, Ontario county. 



Proetus microgemma. 



Page 109. 

 Fig. 33. A normal pygidium, showing the characteristic ornamentation, and the broad border. Enlarged 

 to two diameters. 



Corniferous limestone. Phelps, Ontario county. 

 I<"ig. 34. A very small pygidium, referred with some doubt to this species. The annulations are more dis- 

 tinct and more numerous than in the preceding specimen, a feature which may be due to a less 

 advanced stage of growth. The axis'is covered with tine pustules, which are not represented 

 in the figure. The relatively large size of the axial nodes give an appearance of angularity 

 to the annulations. Enlarged to six diameters. 



Corniferous limestone. Canandaigua, Ontario county. 



PlIILLIPSIA, sp. ? 



Fig. '.'i~>. The pygidium. A s] imen from which a portion of the crust has been removed. 



Lower Carboniferous limestone. R<ar O'riinU Rapids, Michigan. 



