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POPULAR SCIENCE REVIEW. 
teristics of Dinosaurian structure ; and that Professor Huxley 
has himself thought it necessary to institute under the name 
Parasuchia, a division of the Crocodilia further removed from 
living crocodiles than the Teleosauria of the secondary rocks, 
for such extinct genera as Belodon and Staganolepis, for- 
merly classed as Thecodonts. Yon Meyer at first referred 
Belodon to the Pachypoda, hut afterwards thought that Belodon 
'was more of a Crocodile than a Lizard, and could not be 
included in that group. Many of the remains at first referred 
to Belodon from the Stuttgart neighbourhood are really 
referable to Zanclodon ; but the true Belodon presents characters 
which show a singular transition in some respects from the 
Crocodile towards the Dinosaur. Thus with a Crocodilian 
twist the long femur has more the shape of a Dinosaurian 
femur than that of the Crocodile, and it has the characteristic 
Dinosaurian trochanter fairly developed on the inner side of 
the shaft, though placed a little higher than usual. The 
humerus is, however, much more Crocodilian in having the 
radial crest reflected downward instead of inward ; and the 
animal was covered with immense and close set plates of dermal 
armour, which rested upon the expanded tops of the neural 
spines, and this covering gave to it a very Crocodilian aspect. 
Similarly, the Aetosaurus of Fraas, sheathed in armour of a 
like kind, yet has a remarkably Dinosaurian type of pelvis; and 
the femur, like that of Belodon, shows the trochanter on the 
middle of the shaft, which is generally regarded as Dinosaurian. 
The tarsus, however, is distinct, the astragalus and calcaneum 
being separate. 
How it is quite possible that these animals and Staganolepis 
are more nearly related to theDinosaurs than to Crocodiles ; but if 
so, it only demonstrates that some Dinosaurs must he much more 
Crocodilian than we have hitherto had reason to believe. There 
are several modifications of the Dinosaurian skull. One specimen 
figured by Mr. Hulke, and referred to Iguanodon, exhibits the 
form of the brain-case and its central cavity, showing that the 
brain was remarkable for its great height, that it was com- 
pressed from side to side, and apparently distinguished into 
cerebrum, optic lobes, and cerebellum, placed successively 
behind each other, on the reptile plan, though not like any 
living reptile, and making no approach in shape to the brain 
of a bird (see Fig. 2). A portion of the base of the brain-case of 
a Dinosaur from the Potton sands, which has been named 
Craterosaurus, is similar to the same region of the skull in 
the Hew-Zealand Lizard Hatteria, but makes several approxi- 
mations to the Crocodilian pattern. Another Dinosaurian 
skull is referred to Scelidosaurus by Professor Owen ; and 
skulls of the Hypsilophodon have been figured by Professor 
