EXTINCT AMPHIBIA OF NORTH AMERICA 73 
strong and curved backwards and they have the strong longitudinal 
fluting which is characteristic of many of the labyrinthodonts. An- 
other character which would distinguish the form is the pattern of 
the cranial sculpture. This consists of inosculating pits and grooves 
Fic, 17.—Restoration of the skull of Macrerpeton huxleyi Cope. One-half natural 
size. 
of a coarse character and compares favorably with the sculpturing 
of the later forms like Anaschisma from the Trias of Wyoming. If 
this form really represents a labyrinthodont-like form it is the oldest 
of the kind so far known since in all probability the Hosaurus verte- 
brae come from a higher horizon. ‘The specific characters have been 
given by Cope and further discussion will be deferred. 
