THE SKULLS OF ARAEOSCELIS AND CASEA 747 
It would of course be premature to say that Kadaliosaurus 
and Araeoscelis are congeneric, but I cannot resist the belief that 
they are closely allied at the least. Possibly here, as so often 
elsewhere, the conclusions based on negative evidence are unreliable. 
It is not at allimprobable; indeed I think it very probable, that the 
isolation of the American Permian fauna, in which I have concurred, 
will eventually be shown to be much less than has been supposed. 
As a postscript I may mention, that, notwithstanding the 
general accuracy of Credner’s descriptions, his interpretation of the 
scapula and coracoid of Paleohatteria is quite wrong. The genus 
has a normal pectoral girdle, with the coracoid closely united to the 
scapula, and probably with the usual supracoracoid foramen. The 
scapula is rather short, perhaps an indication of subaquatic habits. 
As I have stated elsewhere, I could find no indication of a supra- 
temporal vacuity in Paleohatteria, and much evidence that there 
was none. I may also add, that from an examination of the speci- 
mens of Haptodus in the Paris museum, kindly granted me by M. 
Thevenin, I am confident that the two genera are distinct. Paleo- 
hatteria has a distinctly rugose skull, while that of Haptodus is 
quite smooth. 
