12 I C H N O L ü G r OF ANNANDALE.
M '
CHKLICHNUS AMBTGUUS, JARD.
PLATES VL XL
TIIKSE iniprossions wo consider also to have been iiuprluted by a Chelonian, but of a different for.n from tliat
C. diinraui. The animal must have possessed longer limbs and been more slender; the footprint is loss in
«i.e. 'riic distance between the impressions, or the length of stride, is proportionally longer.
In Pi.A'i-ii VL the slab is a very beautiful and distinct cast, exhibiting a series of six impressions. The
sole or pad shows a uniform surface of about 1.5 in breadth, famished anteriorly with four toes, slightly
separated, to which there has, in all probability, been a Hfth connected, though it has left no indentation. Tn
this slab the animal has placed the oue foot in the impression of the other, a mode of progression not uncommon
muong the Ohclonians, where the hindfoot even sometimes oversteps the print of the forefoot, and would thus
to stand first. The round jirojectious, in front of the full cast, are those of the toes or claws of the
other foot, and must liave been of more irregular length. The distance between the impressions or length
of stride is about G. 6.
In PLATE XI. which we have also referred to this animal, we have the impression or mould. The
slab was uncovered after PLATE VI. was lithographed, and it seems to confirm the opinion we have expressed
regarding it. This Plate is scarcely so clearly lithographed as some of the previous figures. The slab
exhibits distinctly a round foot, similar to the cast of PLATE YI. with an anterior print (most probably from
the hinderfoot overstepping), shoAvIng three toes of irregular length, that seem to have been furnished with
sliurp claws ; the proportions of the stride and length of the animal being nearly the same as in PLATE VT.
i I'
I C H N O L O G Y OF ANNANDALE. 13
CHELICHNUS DUNCANI,(?) OWEN
P L A T E VIIL
WE are disposed to refer this impression to a small or young Chelonian, on account of the shortness and
regularity of the pace ; but although we have placed it provisionally under the name of C. dancani, we are
not prepared decidedly to consider it as such. The slab however is an extremely interesting one, the layers
of sand, as the breaks show, must liave been actually in a process of dopo.sition when tlie impressions were
imprinted. The bed or beach has also been in a somewhat inclined position, the impressions evidently show
the animal to have been slipping laterally where the track is diagonal or across the bed, and also sliding
forward when the track is in the straight position. Upon the corner of the slab are the footprints of another
animal, those wdiich we refer to H. smtrophsiiis.
f
CHELICHNUS PLAGIOSTOPUS, JARD.
P L A T E X.
THIS is a very remarkable impression. It was discovered on spHtting what appeared to be one of the regnhir
beds of the Qnarry, and tl.e fissure has completely divided the sand or substance filling up the l.ollow of the
impressions, so as to leave them on each surface, representing the fonn only, but with no outline of toes or
claws. The slabs are in length 4.5, and on them are marked a series of twenty-one oblong prints, placed
obliquely, and separated from each other by a space or stride of fVom 1 to i.5. This imprint is distinguished
from all the others by the peeuhar oblique direction in which the feet are set down. The filled up mould
is of an irregular oval shape, from 1.5 to 1. 8 in length, 8 or 9 in breadth; the width over the impressions
is about 4.2, which, when taken in conjunction with the short pace, would indicate a short and wide form of
animal.