PLATE XVI A—Coiitiuuea. 
Hamilton group. Canandaigua, Ontario county. 
Fig. 1.^. An individual in a still later, immature stage of growth, enlarged to seven diameters. 
Hamilton group. Hopewell, Ontario comity. 
Fig. 16. A fragment i-epresenting the largest pygidium obsei’ved. 
Hamilton group. CanandMigua Lake. 
Fig. 17. Four marginal spines of a pygidium, similar to the one i-epresented in fig. 9. Enlai'ged to three 
diameters. 
DaLMANITES (CRYPHdEUS) BaRHISI. 
Page 48. 
Fig. 18. A pygidium, enlarged to three diameters, and showing the round, terete marginal spines, and the 
con.spicuous terminal spine. 
Hamilton group. Daveripo^'t, Iowa. 
