PLATE XXIV— Continued. 



Cyphaspis hybrida. 



Page 144. 

 14. A (ragmen! of tin- cepha ./ the pustulose glabella, and the strongly punctate frontal 



I larged t" tin liameters 



Cornifen 'i- limestone. Ganandaigua, Ontario county. 



C'VI'II ASMS CRASPEDOTA. 

 i'age US. 

 l.'i. A fragment of limestone, showing one entire individual and the eephalon of another, accompanied 

 bj two uearlj entire spi i I Dalinanites Boothi var. Callitetes. 



Hamilton group. Canandaigua, Ontario county. 

 Fig. 16. Thee men in the foregoing figure, enlarged to three diameters, retaining- the ciTiat, with 



ion of the eyes and two of the axial spines, and showing the proportions and characters 



Fig. 17. Profile of the same, with the th racic spines restored. 



l individual, viewed in profile. Enlarged to three diameters. 

 19. Front view ' f the same, showing the elevation of the eyes, which have been restored from another 



UUill. 



Hamilton group. Canandaigiia, 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 eephalon, showing the bead-like tubercles on the frontal margin. Enlarged to 



three diameters. 

 Fig. 21a A profile of the same in outline, showing the frontal depression and elevated margin. 

 Hamilton group. Canandaigua, Ontario county. 



CYPHASriS ORNATA, v;ll'. BACCATA. 

 I'age 146 

 22. A fragment oi a eephalon, enlarged to three diameters. The drawing fails to show with sufficient 

 emphasis the axial of the glabella, which, .serves as a varietal feature. 



I 22a. Outline profile of the same, showing the contour of the head-shield. 



Hamilton group. Canandaigua, Ontario county. 

 \ portion of the right tree cheek, showing the marginal ornamentation and the broad, rapidlj 

 tapering spine. Enlarged to three diameters. 



Hamilton group. Canandaigua, Ontario county. 



Phaethonides Macrobius. 



Page 139 

 24. The intra-sutural portion of the eephalon, natural size. The drawing shows one pair of lateral 



glabellar furrows, but fails to indicate the fainter anterior pair. 

 J4a. Outline profile of the same, showing the position of the lateral glabellar furrows. 

 Lower Helderberg group. Square Lake, Maine. 

 l pygidium of this species. Enlarged to three diameters. 

 Lower Helderberg group. Square Lake, Maine. 

 iirei are introduced for comparison with the New fork species of this genus. 



