PLATE XIX. 

 Lichas (Teeataspis) qrandis. 



See Plates 17 and 18. 

 Fig. I. A fragment of tin- pygidium, retaining one "f the terminal spines and ;i portion of the other. 

 showing the size and distribution of the spinules upon their surface. The drawing is made 

 from a gutta-percha impression of the dorsal surface. 



Schoharie grit. Near Clarksville, Albany county. 

 Fig. 'J. An imperfect pygidium, retaining a portion of the crust, and showing the character of the axis 

 and post-axial area. 



Schoharie grit. Schoharie, Schoharie county. 

 Fig. :i. An imperfect pygidium of average size, showing the internal surface and retaining portions of the 

 spines, the missing parts being restored in outline. This specimen is in the "Ward Museum of 

 Rochester University. 



Schoharie grit. Schoharie, Schoharie county. 

 Fig. 4. A very small pygidium, in which the axis and lateral annulations extend to the margin. Referred 

 with some doubt to this species. 



Schoharie grit. Near Clarksville, Albany county. 

 Fig. 5. The frontal lobe of a small individual, with a portion of the cheek attached. 



Schoharie grit. Schoharie, Schoharie county. 

 Fig. i''. The axial arch of a large thoracic segment, showing the strong divergent spines. The figure is 

 drawn from a gutta-percha impression from a natural mould of the dorsal surface. 

 Schoharie grit. Knox, Albany county. 

 Fig. 7. A thoracic segment of a smaller individual, drawn in profile, showing the axial spines. 

 Schoharie grit. Near Thompson's Lake, Albany county. 



Lichas (Conolichas) pustulosus. 



Page 80. 

 Fig. S. A pygidium, retaining a portion of the crust, showing the broad, doublure, the two pairs of lateral 

 spines and the conspicuous terminal lobe. 



Lower Helderberg group. Near Clarksville, Albany county. 

 Fig. lo. The left free cheek of a large example. 



Lower Helderberg group. Schoharie, Schoharie county. 

 Fig. 1 1. The right free cheek of an individual of about the same size as the preceding. 

 Lower Helderberg group. Schoharie, Schoharie county. 



Lichas (Conolichas ?), sp. '1 



Page 80. 



Fig. 9. A pygidium, showing the internal surface, three pairs of lateral lobes and a relatively narrow 

 terminal lobe. This specimen was incorrectly figured in Paleontology of New York, vol. iii, pi. 

 78, tig. 7, and was there referred to Lichas pustulosus. 



Lower Helderberg group. Schoharie, Schoharie county. 



