PLATE XXIV—Continueil. 
Cyphaspis IIYBRIDA. 
Page U4. 
Fig. 14. A fragment of the cephalon, showing the pustulose glabella, and the strongly jninctate frontal 
area. Enlarg-ed to three diameters. 
Corniferous limestone. Canandaigua, Ontario county. 
Cyphaspis craspedota. 
Page U8. 
Fig. 15. A fragment of limestone, showing one entij-e individual and the cephalon of another, accompanied 
by two nearly entire specimens of Dalmanites Boothi var. Galliteles. 
Hamilton grouji. Canandaigua, Ontano county. 
Fig. 16. The entire specimen in the foregoing figure, enlarged to three diameters, retaining the crust, with 
the exception of the eyes and two of the axial spines, and showing the propoidions and characters 
of the species. 
Fig. 17. Profile of the same, with the thoracic spines restored. 
Fig. 18. An enrolled individual, viewed in profile. Enlarged to three diameters. 
Fig. 19. Fi'ont view of the same, showing the elevation of the eyes, which have been restored from another 
specimen. 
Hamilton group. Canandtaigua, Ontario county. 
Fig. 20. A pygidium. Enlarged to six diameters. 
Hamilton group. Canandaigua, Ontario county. 
Cyphaspis ornata. 
Page 145. 
See Plate 21. 
Fig. 21. A portion of the ceiihalon, showing the bead-like tubercles on the fiontal margin. Enlarged to 
three diameters. 
Fig. 21a A pi-ofile of the same in outline, showing the frontal depression and elevated margin. 
Hamilton group. Canandaigua, Ontario county. 
Cyphaspis ornata, var. baccata. 
Page 146. 
Fig. 22. A fragment of a cephalon, enlarged to three diameters. The drawing fails to show with sufficient 
emphasis the axial elevation of the glabella, which serves as a varietal feature. 
Fig. 22a. Outline profile of the same, showing the contour of the head-shield. 
Hamilton group. Canandaigua, Ontario county. 
Fig. 23. A portion of the right free cheek, showing the marginal oi-namentation and the broad, rapidly 
tai.)ering spine. Enlarged to three diameters. 
Hamilton group. Canandaigua, Ontario county. 
Phaethonides Macrobius. 
Page 139. 
Fig. 24. The intra-sutural portion of the cephalon, natural size. The drawing shows one pair of lateral 
glabellai- furrows, but fails to indicate the fainter anterior pair. 
Fig. 24a. Outline jirofile of the same, showing the position of the latei-al glabellar fui-i-ows. 
Lower Helderberg group. Square Lake, Maine. 
Fig. 25. A pygidium of this species. Enlarged to three diameters. 
Lower Helderberg group. Square Lake, Maine. 
These figures are introduced for comparison with the New York species of this genus. 
