SYSTEMATIC REVISION 35 



In 1896 Cope added to his description of this species: 



"The long maxillary tooth below the anterior half of the orbit. Head short, 

 wide; orbit small, half interorbital width; length of skull about 25 mm." 



Revised description of the genus and species: 



1. Skull low and rounded anteriorly, resembling that of the Amphibia. 



2. Orbits large and located at the middle of the skull. 



3. Teeth more sharply conical than in the Captorhinidce, but less so than in the 



Amphibia. 



4. One or two cheek teeth anterior to the orbit sharply larger than the others. 



Incisors not enlarged. 



5. Teeth probably in more than one row in both upper and lower jaws, but no 



evidence. 



6. Basioccipital and basisphenoid large and forming a broad plate on the base 



of the skull. 



7. Supraoccipital plates standing nearly vertical at the back of the skull. 



8. Surface of the skull with fine sculpture. 



9. 10, 11. Not determinable. 



The type specimen is in very poor condition, showing little more than the 

 general outline and a few maxillary teeth. The homotype is in much better con- 

 dition. Its measurements are as follows: 



mm 



Length 20.5 



Anteroposterior diameter of orbit 6. 



Interorbital width 4-5 



Breadth of skull at posterior border 14. 



Genus ECTOCYNODON Cope 



Ectocynodon Cope, Proc. Am. Phil. Soc, vol. xvn, 1878, p. 508. (Also Pal. Bull. 29.) 

 Pariotichus Cope, Proc. Am. Phil. Soc, vol. xxxiv, 1896, pp. 446 and 447. 



Type: An imperfect skull. No. 4345 Am. Mus. Nat. Hist. Cope Coll. From 

 Texas. 



Original description: "Char. Gen. Cranium short and wide, with large post- 

 frontal bones and a large orbit. Cranial bones sculptured, but no lyra. Teeth 

 rhizodont, with elongate compressed crowns with anterior and posterior cutting edges. 

 One of these between the orbit and nostril larger and longer than the others, and 

 lying outside of the closed dentary bone. Mandibular symphysis not sutural, but 

 ligamentous. Terminal mandibular tooth not small. Teeth not faceted, simple. 



"This genus, which I suppose to be reptilian, is represented by a specimen 

 which lacks the posterior portion of the skull; hence its near affinities can not be 

 determined. In the character of the cranial sculpture it resembles crocodiles, and 

 the Labyrinthodont genera cotemporary with it, and differs from Lacertilta with 

 cranial sculpture known to me." 



This does not include the definition given of Ectocynodon incisiviis (31) which 

 belongs in the genus Captorhinus. 



Ectocynodon ordlnatus Cope. 



Ectocynodon ordinatus Cope, Proc. Am. Phil. Soc, vol. XVII, 1878, p. 508. (Also Pal. Bull. 29.) 

 Pariotichus ordinatus Cope, Proc Am. Phil. Soc, vol. xxxiv, 1896, pp. 446 and 447. 



Type: A fragment of a skull. No. 4345 Am. Mus. Nat. Hist. Cope Coll. 

 From Texas. 



