EXTINCT AMPHIBIA OF NORTH AMERICA 53 
The remains include a nearly complete cranium and a complete 
clavicle of the right side. The species agrees in all essential respects 
with the characters of the genus Tuditanus, presenting a broad, flat 
head, and a triangular thoracic shield. 
The cranium is wider than long and the muzzle is broadly rounded 
(Fig. 8). The orbits are wide ovals, and their posterior borders fall 
little behind the trans- 
verse line dividing the 
skull equally. The inter- 
orbital width equals the 
longitudinal diameter of 
the orbit. ‘The posterior 
outline of the cranium is 
truncate in a _ straight 
transverse line between 
the prominent  epiotic 
angles. The composition 
of the cranium is differ- 
ent trom any of. the 
other species referred to 
this genus in the large 
size of the epiotic and 
the fact that the squa- 
mosal is excluded from 
the parietal by the exten- Fic. 8.—The skull and right clavicle of Tudi- 
sion of the postorbitals tanus tabulatus Cope. One and one-half times 
ch aN E natural size. 
and the epiotics. This . 
may be a generic character and entitle the form to another name 
but it is retained here for the present. The elements of the 
anterior part of the skull are not preserved but they are indicated 
by the broken lines. The nostrils are, however, clearly indicated as 
bosses of shale. There is a mere fragment of the nasal preserved 
posterior to the crack indicated by the transverse line (Fig. 9). The 
frontal is elongate as in other species of the genus and forms the inner 
border of the orbit. The parietal, as usual, is one of the larger bones 
of the skull roof and the pineal foramen is inclosed in the median 
suture by the two parietal elements. ‘The parietal opening lies in 
