EXPLANATION OF PLATES. 
PLATE 1. 
Fig. 1—The nodule containing the remains of Amphibamus grandi- 
ceps Cope. X1. (No. 1234, Yale Museum.) 
Fic. 2.—The opposite half of the same nodule. X 1. 
Fic. 3.—EFrierpeton branchialis Moodie. X 1. (No. 801, Yale Museum.) 
Fic. 4.—Cephalerpeton ventriarmatum Moodie. X1. (No. 796, Yale 
Museum.) 
