Extinct Fishes, Mollusca, and Crustacea 



Cepha'aspis; 2, Pterichthys; 3, Coccocosteus; 4, Diplacanthus; 5, Hoioptychms: 6. 



Osteolepis; 7, 12, 20, Gasteropods; 8, Crinoid; 9, Eurypterus; 10, 13, 15, 18, ic,, 



Trilobites; 14, 16, 17, 23, C ephalopods (Ammonites); 21, 22, Spirifers 



