8 
ANNALS OF THE QUEENSLAND MUSEUM. 
the inlet of the mandibular canal have been laid open to inspection. 
Occupying a place amongst them there is, strange to say if my 
interpretation of it be correct, a funicular body 3 mm. in diameter 
which can hardly be anything else than the common sheath of the 
dental nerve and its accompanying vessels filled with sediment. 
Into the canal itself no sediment has found access. In soft tissue, 
areolar or fibrous, when immersed in mud, prolonged immunity from 
decomposition or from destruction by living agents seems incredible. 
Recourse can be had to two conclusions only : the skull was buried 
immediately after death or mineralization was, under peculiar con- 
ditions, effected so rapidly that the foramen was closed against the 
ingress of sediment into the jaw itself. The symphysial end of 
the bone is to all appearance greatly overhung by the upper jaw, but 
to an extent which might possibly be diminished by a complete 
removal of the matrix in front of it, in which case the length of the 
unsutured symphysis Avould be seen to be more than the 34 mm. 
now visible. The choana? are situated between the tympanic cavities. 
Hind Limb : Femur. — The femur is instructively displayed on 
the upper edge of the fragment containing the younger skull. Its 
head indeed is buried in the rock, and unfortunately the space 
between the sides of the skull is too narrow to permit continuance 
of endeavour to bring it to light. It is, in fact, not quite certain 
that it remains to be found. The parts visible are the trochanters, 
the semi-circumference of the shaft, and, to a greater height above 
the matrix, the distal extremity. The great trochanter, of which the 
extent is easily traceable though the summit was found to be missing, 
was very much higher than the lesser and connected with it by a 
ridge crossing the valley between them. The shaft is cylindrical ; as it 
descends from the trochanters it diminishes rather rapidly in breadth 
as far as the middle of its length, then increases and curves outwardly 
till it is lost in the articular dilatation. This is as usual thick, convex, 
without special areas of adaptation to the tibia and fibula. On the 
fibular side a portion of the bone is absent, but the entire edge of the 
fracture is visible. The dimensions of this bone will more conveni- 
ently be stated in conjunction with those of the segment following. 
Tibia. — The distal long bones, half concealed, lie beside the 
adult skull, this and the long striated triangular depression on their 
ends, indicative of reptilian origin, are circumstances suggesting the 
