138 dla dela IWDISS 
distally so that that part which unites with the transverse has a width 
of one inch. It bears on its outer free surface a rounded vertical 
ridge which adds considerable strength to the bone. It is on the 
inner face of this extension that the transverse is attached. 
The posterior wing begins with the vertical process referred to, 
which has a height of seven-eighths inch and an extent across the 
palate of one and one-eighth inches, and merges with the lateral wing. 
The posterior wing forms a broad, nearly vertical plate. Its upper 
edge comes in contact with the lower part of the cranium. The 
lower edge is thickened and presents a broad surface very much as 
this element does in Amblyrhynchus. The quadrate unites with the 
pterygoid along the entire posterior border of the latter bone. This 
portion of the pterygoid, as indeed the entire bone, presents strong 
lacertilian affinities, and resembles the bone as found in lizards and 
mosasaurs much more than that in crocodiles, where the quadrate 
occupies the space here taken by the pterygoid. 
The vertical transverse processes may be taken as marking the 
posterior boundary of the palate, although between and partly behind 
them is an opening into the interior of the skull, which may belong 
to the palatal region. 
Koken, in his paper to which reference has already been made, 
states that the pterygoids scarcely come in contact. Whether by 
this he means that they do meet is not clear, but they certainly do not 
do so in the specimen studied. Here they are separated by the vomers, 
which extend from the posterior wings of the pterygoids forward to 
the nares and between these as much-narrowed bones. It is probable 
that they again widen in front of the nostrils and here meet the pala- 
tines laterally and the premaxille anteriorly, a short distance, per- 
haps one-half inch, in front of the end of the nares. The maximum 
width of the vomers is five-eighths inch. 
Cranium.—The brain-case is very small, measuring not over two 
and one-half inches from the opening of the foramen magnum to the 
beginning of the olfactory canal, and about one and one-fourth inches 
in transverse diameter, external dimensions. The roof is formed 
by the extreme posterior portion of the frontals, the parietals, and 
the supraoccipital. The lateral walls are composed of the alisphe- 
noids, the prodtics, the inferior processes of the parietals, and the 
