s 



PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL, 69 



It is evident that these continental Triassic deposits comprise a 

 long period, the close of which about coincides with the close of 

 Triassic time, and whose middle and older part is about a parallel 

 of the German " Lettenkohle." The beginning of these deposits is 

 probably at least in the time of the earlier or later Muschelkalk. 



From these considerations it seems that in the eastern Trias the 

 equivalent of the lowest Trias is missing, and even in the central 

 and western continental Trias such equivalents are at least not 

 shown. Only middle and Upper Triassic deposits are evident, as 

 has also been shown in Neue Beitrage zw^ Kenntnis der Parasuchier.^^ 



Figs. 3-5. — 3, IntercI/Avicle of a Parasuchian. Middlej Teias from near Tanners 

 Crossing, Little Colorado Valley, Ariz. U. S. Nat. Mus. No. 2153. View from 

 BELOW. 4, Left humerus of a Parasuchian, same locality. U. S. Nat. Mus. No. 

 2154, a, FROM IN FRONT, 6, from above, c, from below. 5, Left femur, without 



DISTAL END OF A PARASUCHIAN^ SAME LOCALITY. U. S. NaT. MUS. NO. 2163, a, FROM 

 BELOW, 6j OUTLINE OF PROXIMAL FACE, C, SECTION IN MIDDLE AT NARROWEST PLACE. 



All FIGURES 1 : 4 nat. size. 



In the Texas Dockum beds is the very primitive Desinatosuchus and 

 such more advanced forms as PromystriosucTius and LeptosuchuSo 

 But it is possible that they are not quite of the same age. 



A few specimens from the United States National Museum's col- 

 lections are here figured. They had kindly been forwarded to the 

 writer who wishes to express his thanks. , 



At this time I wish to express my thanks to Dr. J. B. Reeside, 

 of the United States Geological Survey, for the valuable notes and 



'wjahrb. Preuss. Geol. Landesanst. for 1921 (1922), vol. 42, pp. 49-160. 



