KMONOSA UHUS QUEENSLAND1CUS. 
3 
mediterranean nature of our ancient Cretaceous sea was suitable for the development 
of a few megalomorphic species, perhaps owing to lack of competition. There is 
an alternative suggestion that these forms were approaching extinction, a phase 
which is often associated with megalomorphism. 
In addition to these long bones, there is a fragment of the proximal end 
of a mandible, an incomplete centrum and two distal fragments of a long bone, 
but these are too abraded to yield much evidence. 
Text-figure 2 . — Kronosaurus queensUmdicus. Section through abraded head and trochanteric 
buttress of Left Humerus. 
The incomplete limb-bones have evidently been subjected to colossal 
strains. In the first place, the fracture of the massive cylindrical shafts, which, 
when unabraded, attained at least eight inches in diameter, must have been the 
result of tremendous pressure. Apart from the fractures, the areas of abrasion 
are very considerable, and in the longer specimen much of the articular surface 
of the head has been lost. When the two bones are placed in juxtaposition, 
however, making due allowance for abrasion, there is so much similarity between 
the contours of the articular surface and the buttress for the attachment of 
muscles that they have been interpreted as right and left humeri. In view of 
their incompleteness, and also of the lack of outstanding distinctions between 
the femora and humeri of these paddle-limbed reptiles, the possibility of an error 
is here recorded, and additional material may show that one or both of these 
fragments may be femora. 
