PLATE XI B. 
DaLMANIT'ES (OdONTOCEPHALUS) iEGEllIA. 
Page 53. 
Fig. 1. The ceiihalon. A cast of the internal surface from which the eyes have been broken ; showing 
the eleven denticulations on the frontal margin and the long, slender genal .spines. 
Fig. 2. Profile of the same.- 
Upper Helderbei-g limestone. WiUiam.wille, Ei'ie county. 
Fig. 3. A neai-ly entire individual, enlarged to two diameters, showing the distinguishing features of the 
species. The pygidium has been drawn too narrow and constricted near the posterior exti-em- 
ity, and the caudal spines too long. 
Fig. 4. Profile of the same. 
Corniferous limestone. CMttenango, Madiaon county. 
Fig. 5. Dorsal view of the frontal cephalic boi-der, enlai-ged to two diameters, showing the shape and 
number of the denticulations. 
Ui)per Helderbei'g limestone. WUUamsville, Erie county. 
Fig. 6. Lower sui-face of the frontal doublure, enlarged to two diameters, showing the incisor-like form 
of the denticulations and the openings of the vertical tubuli pores. 
Upper Helderberg limestone. WilUmnsville, Erie county. 
Fig. 7. A pygidium, showing unusually long tei-ininal spines. 
Upjier Helderberg limestone. Williamsville, Erie comity. 
Fig. 8. A smaller pygidinm. 
Fig. 9. Profile view of the same. 
Ujiper Helderberg limestone. WUUamsville, Erie county. 
Fig. 10. A pygidium of average size, showing normal proportions. 
Upper Helderberg limestone. Schultz's Farm, near Clarence, Erie county. 
Fig. 11. The axis of the pygidium, drawn from an internal cast, to show the median depression and obso¬ 
lescence of the annulations near the extremity. Enlarged to two diameters. 
Upper Helderberg limestone.’ Schultz's Farm, near Clarence, Erie county. 
DalMANITES (OdONTOCEPHALUS ?) CORONATUS. 
Page 54. 
Fig. 12. The pygidium and a portion of the thoi-ax. The specimen shows the characteristic broadly emar- 
ginate, aspinose posterior extremity, and a somewhat shorter pygidium than in the associated 
species. 
Corniferous limestone. Near Auburn, Cayuga county. 
Fig. 13. The pygidium of the same specimen, introduced for comparison with the adjoining pygidia. 
Pig. 14. An imperfect pygidinm, referred with doubt to this species. 
Corniferous limestone. Schoharie, Schoharie county, 
Dalmanites (Odontocephalus) selenurus. 
Page 49. 
See Plate 12. 
Fig. 15. A pygidium preserving normal proportions and showing the divergent, slender terminal spines. 
One side of the figure is somewhat restored. 
Corniferous limestone. Schoharie, Schoharie county. 
Fig. 16. A small pygidinm having more nearly parallel spines ; drawn from a cast of the internal surface. 
Pig. 17. The same, viewed in profile, showing the elevation of the terminal spines. 
Corniferous limestone. Canandaigua, Ontario county. 
Fig. 18. A somewhat im^aerfect pygidium with the terminal spines inclined slightly inward. 
Corniferous limestone. Phelps, Ontario county. 
