30 REVISION OF THE PELYCOSAURIA. 



FOREIGN FORMS, 

 Callibrachlon gaudryi Boule and Gleng:eaud. 



Bull, de la Soci^te d'Hist. Nat. d'Autun, t. xvi, 1893, p. i. 



Type : A nearly complete .skeleton. From the Permian beds of Autun, France. 

 Original description (Translated and condensed) : 



The pterygoid has an external process which abuts against the lower jaw. 



The lower edge of the maxillary is convex. 



The incisor teeth are large. The anterior maxillary teeth are small and grow 

 larger in the anterior third of the maxillar}-, then smaller again to the pos- 

 terior end. The teeth are conical, sharp, and placed in the alveoli. 



The lower jaws have a high coronoid process. 



The vertebne are platycoelous or slightly procoelous. 



The cervicals are apparently strongly opisthocoelous. 



The sides of the vertebral centra are concave. 



No intercentrum is seen. 



The notochordal canal is persistent. 



The neural arch is free. 



The diapophysis is not developed (in the lumbars) and the spines are low with 

 expanded distal ends. 



The cervicals are elongate. 



The number of cervicals and dorsals is not given. The sacrals are not seen. 



There are about twenty presacrals. 



The thoracic and lumbar vertebrte are remarkably long and slender. 



The ribs are single-headed and attached directly to the centrum. 



There are no abdominal ribs or other annature. There are traces of structures 

 that may possibly be scales. 



The coracoid and scapula seem to be loosely attached (the procoracoid is not 

 mentioned). 



The clavicle is slender and enlarged at the distal end. 



The interclavicle has an enlarged head and long posterior process. 



The humerus has greatly expanded ends and a strong deltoid crest. The shaft 

 is slender in the middle. The distal end is at right angles to the proximal. 



An epicondylar foramen is present. 



The ilium alone is preserved, the surface finely sculptured. There is a single 

 impression for the attachment of the sacral ribs. The ilium is broader than 

 long, the acetabular cavity wide, but shallow. Both pubis and ischium are 

 lost, but they were probably loosely attached to each other. 



The posterior limb has the same size as the anterior. 



Meastiyeynenis. 



mtfi. 



Total length of specimen as it lies, about 462 



Humerus 70 



Length, lower jaw 70 



Length, fourth digit of front foot 86 



The tail is absent. 



This specimen is placed by the authors in the Proganosauria {Prote- 

 rosauria). It differs from the Pelycosauria in three points, the elongate 

 cervicals, the opisthocoelous condition of tlie cervicals, and the single-headed 



