PRIMITIVE REPTILES 653 



location among the Pelycosauria,. rather than the Proterosauria. 

 A detailed review of its characters is unnecessary here; the reader 

 will find them in the cited work of Case or in the original paper. 

 So far as I can discover, the genus presents no aberrant charac- 

 ters to distinguish it from the Theromorpha. The temporal 

 region of the skull is unknown; both upper and lateral vacuities 

 have been assigned to it under its assumed relations to Paleo- 

 hatteria and Sphenodon. Possibly Baur's remarks may be 

 apphcable here, as so often elsewhere i^^ ''Dieser Fall zeigt sehr 

 deuthch, wie leicht man sich taiischen lassen kann, wenn man 

 durch eine allgemeine gultige Anschauungsweise beeinflusst 

 wird." I doubt very much whether Callibrachion had both 

 upper and lateral temporal fenSstrae. 



The remains of this genus, together with those of Haptodus 

 and Sauravus cambryi come from the Gargenne schists of the 

 upper part of the Autunian, whose position in the lower Permian 

 I supposed was unquestioned. Huene, however, refers both 

 Callibrachion and Haptodus, as also Aphelosaurus, to the 'oberen 

 Perm,' but gives no reason therefor. 



Aphelosaurus lutevensis Gervais. This genus and species are 

 known from a single specimen from the lower Permian of France. 

 The specimen lacks the head, neck and tail. No intercentra 

 have been detected, though they are doubtless present. Slender 

 abdominal ribs are present. The observed phalangeal formula of 

 the hand is 2, 3, 4, ? , 3. So far as the pubhshed characters indi- 

 cate, there is nothing in the genus to distinguish it from the 

 American Theromorpha. 



Haptodus haylei Gaudry. Thevenin, from a study of the known 

 material, reaches the conclusion that the genus is identical with 

 Paleohatteria Credner published several years later, but is inclined 

 to think that the species are distinct. ^^ Haptodus, like Paleohat- 

 teria is known only from specimens lacking the ossific ends of the 

 Hmb bones, which, taking into consideration the number of speci- 

 mens studied by Credner, would seem to be sufficient proof that 

 the character is an adult one. And such is doubtless the condi- 



18 Zool. Anzeiger, Bd. 12, p. 239, 1889. 

 1^ Annales de paleontologie, 



