OSTEOLOGY OF AMERICAN PERMIAN VERTEBRATES 397 



and Kadaliosaurus; there is even less for Paleohatteria. We have 

 tried to make every doubtful form in the past related to Sphenodon; 

 even Procolophon, a true cotylosaur, has been placed in the same 

 group, as a member of the Diaptosauria. As a matter of fact, 

 Paleohatteria is not intimately related to the primitive rhyncho- 

 cephalian stem, but is more closely allied to the so-called Pely- 

 cosauria, or even to the Proganosauria, as Baur first located it. 

 I had the privilege, also, the past year, of studying the type speci- 

 mens of Paleohatteria in Leipzig. Unfortunately some of the speci- 

 mens had been loaned at the time of my visit to the museum, but 

 the ones showing most conclusively the skull and skeletal structure 

 were available. The results of my observations it will be worth 

 while to reproduce here, though not immediately pertinent to 

 the present subject. The skull, as shown in Credner's Plate 

 XXIV, Fig. 3 , is in my opinion preserved in a more natural profile 

 than is any of the others, and is, I believe, more complete. The 

 outline as I traced it is more complete and perfect than Credner 

 figured it. The lower temporal opening is definitely shown, as 

 are also the relations of the bone marked sq (quadra tojugal ?) . 

 Under the most careful scrutiny with a lens I could find no evidence 

 of an upper vacuity. Neither do I believe that there is evidence 

 of sclerotic plates in the orbits, though I did not see all the speci- 

 mens.^ The skull is rounded posteriorly, not projecting, as Jaekel 

 has figured it. There is nothing in this specimen to suggest an 

 upper temporal vacuity, nor could I find such evidences in any 

 other specimen available for study. I could not distinguish the 

 sutures between the prefrontal and lacrimal in any specimen; the 

 lacrimal is certainly longer than Credner figured it, and it may 

 have reached the nares. The upper surface of the skull, as stated 

 by Credner, is distinctly rugose. 



Credner's figures (Plate XXIV) of the scapula and coracoid 

 are erroneous. The two are in close relation, but with the division 

 visible (Fig. 6). The scapula seems to be somewhat longer than 

 is visible, the upper end hidden below the humerus. The lower 



' It has generally been assumed that the presence of sclerotic plates means aquatic 

 habits, the fact being overlooked that there are not a few purely terrestrial lizards 

 in which the sclerals are highly developed. 



