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PLATE II. 
Homalonotus Dekayi. 
Page 7. 
See Plates 3, 4 and 5. 
1. A very young, partially dismembered individual, showing a strongly annulated and trilobate 
pygidium. 
Hamilton group. Madison county. 
2. A young, distinctly trilobate and nearly entire individual. 
Hamilton group. Ladd's quarry, near Sherburne, Chenango coimty. 
3. Anterior aspect of a somewhat larger, enrolled individual. 
4. Posterior aspect of the same. 
Hamilton group. Near Hamilton, Madison county. 
5. An individual in a still more advanced stage of growth, retaining the trilobate pygidium. The 
figure has been somewhat restored upon the left side. 
Hamilton group. Onondaga county. 
6. An enrolled and uncompressed individual, preserved as an internal cast. 
Hamilton group. Madison or Otsego county. 
7. An individual of about the average normal adult size attained by specimens from the arenaceous 
shales. The specimen is preserved as a cast of the lower surface, and shows the conspicuous 
transverse grooves ui^on the segments of the thorax. The annulations of the pygidium are 
much more obscure than they are made to appear in the drawing. 
Hamilton group. Madison county. 
8. An individual showing but ten, instead of thirteen thoracic segments. The cephalon has ap¬ 
parently been pushed back so as to cover the first three segments. 
9. Profile of the same, showing the elevation of the body and the prolongation of the anterior and 
posterior extremities. 
Flamilton group. Madison county. 
10. A small, impei'fect cephalon. 
Hamilton group. East Worcester, Otsego county. 
11. A cephalon from the soft shales, in which the facial suture is somewhat thrown backward at the 
anterioi- extremity by the ci'ushing of the frontal doublui-e. The anterioi- portion of the suture 
is more transverse in the specimen than is represented in the drawing. 
Hamilton group. Darien, Genesee cmmty. 
12. The hypostoma. 
Hamilton group. Cazenovia, Madison county. 
