Cope.] 44ii [Nov. 15, 



Empedias molakis, I. c, 1883, p. 634. Empedocles molaris, I. c, 1880, 

 p. 10. Diadectes molaris Cope, American Naturalist, 1878, p. 565. 

 Permian of Texas. 



Empedias piiSus Cope, Proceeds. Amer. PJalos. Sac, 1883, p. 634. 

 Permian of Texas. 



Empedias PHASEOLiNrs Cope, I. c, 1883, p. 635. Diadectes phaseolinus 

 Cope, loc. cit., 1879, p. 9. 

 Permian of Texas. 



Empedias latiduccatus Cope, loc. cit., 1883, p. 634. Diadectes latibuc- 

 catus Cope, loc. cit., 1878, p. 505. 

 Permian of Texas. 



Chilontx Cope. 



Proceeds. Amer. Philos. Soc, 18S3, p. 631 ; Trans. Amer. Philos. Soc, 



1892, p. 13. 

 Chilonyx rapidens Cope, I. c; I. c, PI. i, Fig. 2; PI. viii. Fig. 6. 

 Permian of Texas. 



PAPIOTICIIIDJE. 



This family was jjroposed by me in the Proceeds. Amer. Philos. Soc, 1883, 

 p. 631. I there enumerated three genera, one of wliich must be canceled. 

 To the two remaining, I now add three others. They are defined as 

 follows : 



I. External nostrils lateral. 



«• Palatal and splenial teeth with compressed crowns. 



Teeth equal, acute Isodectes Cope. 



Teeth increasing gradually in length anteriorly Captorhinus Cope. 



Teeth enlarged on the middle of the maxillary and anterior part of the 



incisive series Pariotichus Cope. 



««• Palatal and splenial teeth obtuse, forming a grinding pave- 

 ment. 



Median maxillary and anterior incisor teeth enlarged Pantylus Cope. 



II. External nostrils inferior. 

 Mouth posterior in position, mandible short, and with a few acute teeth. 



Bi/popnous Cope. 

 It is probable that Helodectes Cope pertains to this family. 



Isodectes Cope, gen. nov. 



Isodectes MEOALOPsCope. ParioticJius megalops Cope, Proceeds. Amer. 

 Philos. Soc, 1883, p. 630 ; Trans. Amer. Philos. Soc, 1892, p. 25, PI. 

 i. Fig. 3. 

 Permian formation of Texas. 



