ELOPIM!. 
41 
this dentition. The left premaxilla, exposed from the 
oral aspect, is imperfectly shown in Smith’s lower figure ; 
all its teeth are imperfect, and the foremost of the two 
largo inner teeth is represented only by its hollow base ; 
of the six outer teeth indicated, two exhibit the greater 
part of the crown and prove that they are implanted 
almost vertically. Another imperfect dentigerous bone 
shown from the outer aspect on the upper part of the slab 
seems to be the left maxilla. Its oral border, so far as 
preserved, is straight and bears teeth resembling those of 
the mandible, though much smaller ; its outer face is 
flattened, but shows smooth and rouuded irregularities ; 
it is deepest in the anterior third but soon tapers to its 
anterior articulation. The latter is shown to be much 
horizontally extended in a fragment of the right maxilla. 
Some bony laminae covered with a cluster of minute 
pointed teeth, may represent the entopterygoid. Three 
of the largo teeth have been sliced to display their pulp- 
cavity. Among other fragments may be noticed one of 
the hyomandibulars, remarkably expanded and laminar 
in form, with the usual process for the support of the 
operculum. Toulmin Smith Coll. 
33257. Associated imperfect dentaries and right premaxilla ; Lower 
Chalk, Burham, Kent. The narrow thickened mandibular 
symphysis is well shown, and the premaxilla exhibits 
one of the large inner teeth besides some of the marginals. 
Taylor Coll. 
41671, 49905. Fragmentary remains of cranium, quadrate, maxilhc, 
other jaw-bones, and two vertebrae, found associated ; 
Chalk, Ditchling, Sussex. Most of the outer face of the 
cranium is destroyed ; but it is evident that the middle of 
the roof is only gently depressed, while the supraoccipital 
reaches the frontals and prevents the pariotals from 
meeting in the middle line. Part of the ossified sclerotic 
is shown on the loft side. The hinder end of the right 
maxilla is complete, and proves that, although tho bone 
is much thickened in its front portion, it becomes com- 
pressed to a thin vortical lamina behind. Some fragments 
of inner bones of the mouth exhibit clustered minute 
teeth, as in the previous speoimen. Two anterior vertebra! 
are much deeper than long and not pitted at the sides. 
Mrs. Smith's Coll, and Capron Coll. 
