396 S. W. WILLISTON 



elongation of the spines and in the reduced number of dorsals, 

 though I think that the last-mentioned character is doubtful. 

 The limb bones are not so much curved as in Araeoscelis but the 

 epipodials are nearly as long as the propodials. Von Meyer also 

 states that there are no epicondylar foramina in the humerus, and 

 Seeley does not figure or mention any. The presence of a small 

 ectepicondylar foramen, however, might easily have been over- 

 looked, and I suspect that a close examination of adult specimens 

 will disclose its presence. The bones are all very hollow as in 

 Araeoscelis. 



Kadaliosaurus . — There also seems to be much probability of a 

 close genetic relationship between Araeoscelis and Kadaliosaurus, 

 as shown in the skeletal bones in the absence of all knowledge of 

 the skull. I had the pleasure of studying the type specimen of 

 Kadaliosaurus the past year at Leipzig, thanks to the kindness of 

 Drs. Stille and Krenkel. So far as the shapes of the limb bones 

 and vertebrae are concerned, they seem almost identical with those 

 of Araeoscelis. There is, I am convinced, an ectepicondylar fora- 

 men in the humerus, as Credner thought; there was probably also 

 an entepicondylar foramen, though its existence cannot be proved, 

 because of the loss of the ulnar border in the impression of the 

 humerus, where the foramen should be. That the two genera are 

 closely related I have little doubt, though it is hazardous to express 

 a very decided conviction in the absence of any knowledge of the 

 skull. Kadaliosaurus, however, differs generically in the structure 

 of the long bones. I convinced myself thoroughly of the state- 

 ment of Credner that the bones are not hollow, but are composed 

 of cancellous tissue; the ribs, however, like those of Araeoscelis, are 

 hollow. There is, also, a strong armature of ventral ribs, not the 

 slightest indications of which have been observed in Araeoscelis. 

 Further speculations as to the relationships of the two genera will 

 be idle until the skull of Kadaliosaurus is discovered; the char- 

 acters, so far as they are known, ally the two genera closely. 



Paleohatteria. — ^This genus has long been associated with 

 Protorosaurus as a member of the Protorosauria, or Rhyncho- 

 cephalia, on the assumption of two temporal arches. We have seen 

 how small was the justification for the assumption in Protorosaurus 



