PLATE III. 



HOMALONOTUS DeKAYI. 

 See Plates 2, 4 and 5. 

 Fie 1 A small individual from the soft shales, retaining a portion of the crust and showing the median 

 frontal plate enclosed by the branches of the facial sutures upon the epistomal doublure. In 

 the drawing the ampliations of the pygidium are too strongly represented. 

 Hamilton group. Bellmw, Yates county. 

 ■2. A cast of the lower surface of a larger individual, showing the median plate and a portion of 

 the hypostoma displaced from its normal position. 



Hamilton group. Near Leonard&Alle, Madison county. 

 Pig. 3. A cast of the lower surface of an almost entire specimen. 



Hamilton group. Madison county. 

 Fig. 4. A specimen from the soft shales, retaining twelve thoracic segments with the pygidium, and pre- 

 serving the crust. 



Hamilton group. Canandaigua Lake. 

 Fig. :,. A I. lock of arenaceous shale, showing tin- dismembered [.arts of a large individual. 

 Hamilton group. Madison county. 



