17 
broad bony plates,, three in number, of which the two outer 
partly conceal the medium one, their internal edges diverging 
backwards. The vertebrae visible are twenty-six in number, 
and average about an inch, in diameter of centrum. They 
are biconcave, and the short sides are slightly concave, with 
a very distinct rugose marking. The neural arch seems to 
have been very small in proportion to the size of the centrum, 
as is always the case with cold-blooded animals. In some of 
the detached vertebrae the processes are entire, but in most 
they are detached from the centrum, having been imperfectly 
ossified. I infer from this and other indications that the 
animal whose remains are now, after so long an interval, 
disinterred, was not adult. The spinous process, the zyga- 
pophyses, and the pleurapophyses are well seen. Eighteen 
ribs have been found. These all present the interesting 
character of a double articulation. The tubercle and capi- 
tellum are in many cases perfectly distinct. Both facets 
probably articulated with the pleurapophyses of the verte- 
brae. The specimen further exhibits about seventy-four 
well-marked scales. These are about an inch and three- 
quarters in length, and are crossed diagonally along the 
greater part of their length by a rounded ridge. The rest 
of the scale is flattened. At one end the scale is prominent ; 
the other end in all cases thins away gradually. The scales 
were doubtless imbricated and arranged along the ventral 
surface as in P/iolidog aster. These Scales are osseous, and 
comparable to the scales of ganoid fishes. The teeth are 
about three-quarters of an inch in length, striated near the 
base, inserted into and partially anchylosed to shallow 
sockets. A section shows the rudimentary form of a laby~ 
rinthodont tooth, radiating, but not as yet sinuous, folds of 
cement penetrating the outer half of the substance of the 
tooth. Further details must be reserved for the completer 
examination to which our specimen will, I hope, soon be 
2 
