PLATE CXXIIL 
Gomphocekas gomphus. 
Page 32. 
Fig. 1. Lateral view, showing the air-chambers, undulations of the tube, the crenulated zone, and cham¬ 
ber of habitation. Some of the crenulations are seen extending over the walls of the chamber 
on the right side of the figm-e. The impression of the ventral valve of a Crania is preserved 
upon the chamber of habitation. 
Corniferous limestone. Delhi, Delaware county, Ohio. 
Gomphocekas manes. 
Page 34. 
Fig. 2. View of the specimen described, showing its extremely compressed condition, and the depth of the 
air-chambers. The surface shows several branches of polyzoa and young brachiopods which 
were probably attached to the shell. 
Genesee slate. South of Alden, Erie county. 
