1895.1 457 [Cope. 



Measurements. mm. 



Length of mandibular ramus 83 



Interorbital width (approximate) 20 



From the Permian bed of Texas. 



EXPLANATION OF PLATES. 

 Plate VII. 



Pariotichus aguti Cope ; nat. size. 



Fig. L Skull, from side. 



Fig. 2. Skull, with angular parts of mandible adherent, cervical verte- 

 brae and scapular arch, from be^ow. 



Fig. 3. Skull, from above, with cervical vertebrae. 



Fig. 4. Anterior two-thirds of mandibular arch, with adherent pre- 

 maxillary bones, from above. 



Fig. 5. Humerus. 



Plate VIII. 



Fig. 1. Pariotichus hamatus Cope ; two-fifths nat. size ; from above. 



Fig. 2. Do. from the side. 



Fig. 3-5. Hypopnous squaliceps Cope ; skull nat. size ; 8, from side ; 

 4, from above ; 5, from below. 



Fig. 6. Chilonyx rapidens Cope ; left side of skull from behind and 

 below; one-half nat. size, 



Plate IX. 



Diploeaulus magnicornis Cope ; 4-7ths nat. size. 



Fig 1. Cranium, from above. 



Fig. 2. Anterior part of palate. 



Fig. 3. Postquadrate region, from below. 



Fig. 4. Occipital condyles, from below. 



Lettering. 



N., Nasal bone : F., Frontal ; Pef., Prefrontal ; Pof., Postfrontal 

 P., Parietal ; Pmx., Premaxillary ; Mx., Maxillary ; J., Jugal ; Qj. 

 Quadratojugal ; St., Supratemporal ; Sm., Supramastoid ; T., Tabulare 

 So., Supraoccipital ; V., Vomer ; Pa., Palatine ; Par., Paroccipital 

 Ecp., Ectopterygoid ; Ot , Otic bones; Asc, Anterior semicircular ca 

 nal ; Pg., Pterygoid; Q, Quadrate; G., Clavicle; Ep., Episternum 

 JJ., Humerus; Co., Coracoid ; Ic, Intercentrum. 



