1877.] 577 [Cope- 
TUDITANUS TABULATUS, Sp. nov. 
This species is indicated by a specimen which includes a cranium, and 
the anterior part of the vertebral column. It is very well preserved on a 
block of shale, on both faces, aud exhibits the constituent pieces of the cra- 
nium, the vertebre, one of the thoracic shields with probable ribs. In all 
respects it conforms to the genus Tuddtanus in characters ; presenting a 
broad, flat head ; osseous vertebre and ribs ; thoracic shields present, and 
abdominal chevrons probably absent. The last character is not abso- 
lutely assured, since the posterior two-thirds of the vertebral columns are 
wanting. ; 
The cranium is wider than long, and the muzzle is broadly rounded. 
The orbits are wide ovals, and their posterior borders fall little behind the 
transverse line dividing the skull equally. The interorbital width equals 
the longitudinal diameter of the orbit. The posterior outline of the cra- 
nium is truncate in a straight, transverse line between the prominent epi- 
otic angles.. The distal extremities of the quadrates do not project so far 
backwards as the epiotic angles, and are still further removed from a trans- 
verse line marking the extremities of the occipital condyles. In this re- 
spect this species presents a strong contrast to the Pelion lyellit, where the 
ends of the quadrates extend posterior to the latter points. The composi- 
tion of the superior cranial walls much resembles that of the Tuditanus 
radiatus. The epiotics are large bones, longer than wide, and present 
outwards strong angles, which correspond with the horns of Ceraterpeton. 
They enclose between them the posterior portion of the parietal, and the 
supra-occipital. The latter is a transverse bone, and not quite symmetrical 
in the specimen, one end having a greater antero-posterior extent than the 
other. The parietal is the largest cranial bone, is undivided, and is pierced 
by a median foramen behind the centre. Its general form is broadly wedge- 
shaped, the lateral borders expanding in front of the fontanelle, and con- 
tracting between the epiotics. The frontals are distinct and rather narrow. 
The post-frontals are rather large, are in close connection with the parie- 
tal on one side and the jugal on the other, and send a point backwards be- 
tween the epiotic and supratemporal. The jugal widens fan-shaped back- 
wards, joining two bones distally, a superior and an inferior. The former 
is the supra-temporal, but whether the inferior is quadratojugal or squa- 
mosal, I cannot determine. The boundaries of the bones of the extremity 
of the muzzle are not distinct. 
The sculpture of the surface of the cranium consists of parallel ridges 
which are separated by grooves equal to them in width. The ridges radiate 
inwards on the epiotics and frontals, and outwards on the squamosal, and 
are transverse and interrupted on the supraoccipital. The lateral thoracic 
shield is covered with a similar sculpture of uninterrupted somewhat 
radiating ridges. The vertebree are osseous, and rather small compared 
with the size of the skull. Opposite to the posterior extremity of the pec- 
toral shields is a pair of slender bones, which are gently expanded and 
truncate at the extremities. It is not certain whether these belong to the 
