PLATE XII— Continued. 



GOMPSOCTSTITES GLANS, HaLL. 

 Page 352. 



Fig. 14. Lateral view of a cast of a specimen, which shows the general form, the position of the 

 central opening, grooves of the spiral appendages of the dome, and impressions of 

 some of the plates of the dome and body. 



GOMPHOCYSTITBS TENAX, HaLL. 

 Page 352. 



Fig. 15, Enlarged view of a specimen from Lockport, New York, which preserves the plates of 

 the upper part of the body and dome, showing their spiral arrangement and nodose 

 character. 



