Apedodus priscus Leidy 



Page 166 



1 Detached crown, x 2 



2 Detached crown, x 2 

 Chemung beds ; Warren, Pa. 



Onychodus sp. indes. 

 cf. O. sigmoides Newb. 



Page i6g 



3 Imperfect slightly arcuate tooth showing central cavity, x 2 

 Hamilton limestone ; Milwaukee, Wis. 



Onychodus sp. indes. 



Page 160 



4 Detached presymphysial tooth. Cross-section of base of crown 



shown at the right. Natural size 

 Middle Devonic ; Eifel district, Germany 



Original in Museum of Comparative Zoology, Cambridge, Mass. 



Cladodus monroei Eastm. 



Page 62 



5 Detached tooth, coronal apex and portion of the root broken away, x 2 

 Hamilton limestone ; Milwaukee, Wis. 



Rhynchodus sp. 



Page J3 



6 Detached scalelike plate evidently external in position, and regarded 



as a dermal calcification of Rhynchodus. Natural size 



Hamilton limestone; Milwaukee, Wis. 



Similar detached plates are abundant also in the Cedar Valley lime- 

 stone of Iowa, and in the Upper Devonic of Wildungen, in Rhenish 



Prussia. 



Diplodus priscus Eastm. 



Page 59 



7 Detached tooth, anterior face, x 4 



8 Detached tooth, anterior face, x 4 

 Upper Devonic ; Elmhurst, 111. 



Coccosteus sp. 



Page 115 



9 Detached dorsomedian plate. Natural size 



Onondaga limestone, Clifton Springs, N. Y. 



196 



