PLATE V. 
> Homalonotus Dekayi. 
See Plates 2, 3 and 4. 
Fig-. 1. A very young individual, showing the faint lateral furi-ows on the glabella. 
Hamilton group. Pratt's Falls, Onondaga county. 
Fig. 2. Profile view of an uncompressed, partially enrolled, entire individual, retaining the crust and the 
visual surface of the eyes. 
Fig. 3. Front view of the same, showing the elevation of the .eyes. 
From the limestone of the Hamilton group. Canandaigua lake. 
Fig. 4. Profile view of an enrolled and compressed specimen from the shales. 
Fig. 5. Anterior aspect of the same. 
Fig. 6. Postei-ior aspect of the same. 
Hamilton gi*oup. Western New York. 
Fig. 7. A cephalon of medium size. 
Fig. 8. Profile view of the same. 
Hamilton group. Madi.son county. 
Fig. 9. An imj^erfect cephalon. This specimen is the original of Eaton’s Nuttalnia sparsa and was 
obtained by the author in March, 1832, at Stephen’s Mill in the town of Coeymans, Albany 
county. The occipital ring was regarded by E)aton as the anterior border of the head, cori-es- 
ponding to that of Trinucleus (Nuttainla) concentricus. (See Eaton’s Geological Text-book, 
page 34, 1832.) 
Fig. 10. A small pygidium from the limestone, retaining normal convexity. 
Fig. 11. Profile view of the same. 
Hamilton group. Pratt's Falls, Onondaga county. 
Fig. 12. Profile view of a pygidium, a cast of the lower sui-face. 
Fig. 13. Dorsal aspect of the same, showing the usual character of the annulations. 
Hamilton group. Madison county. 
Fig. 14. A cast of the lower surface of a pygidium upon which the annulations are abnormally distinct foi- 
so advanced a stage of gi-owth. 
Hamilton gi-oup. Madison county. 
