1896.] -L^J [Cope. 



Measurements. 



MM. 



Length of skull (median) to anterior l)order of ovl)its . . 78 



Distance from skull to carapace 65 



Length of thirteen carapacial bands 155 



Anteroposterior diameter of first band 17 



" " " seveuth Ijand 12 



The species is named to express the superficial reseml)lance to the 

 Dissorhoph us articula t us. 



CoKODECTES FAVosus, gen. et sp. nov. 



Cluir. gen. — Quadrate bone extending posteriority so that the mandi- 

 bular articulation is opposite the posterior border of the cranial table. 

 Meatus audit orius small, connected with a meatal notch. Xostrils 

 directed upwards and a little outwards. Teeth conic, acute, increasing in 

 length to the middle of the. maxillary region. 



This genus is of much interest, as it displays the character of the 

 family in a less pronounced degree than the genus Octocoelus, and thus 

 approximates more nearly the other forms of Cotylosauria. Its structure 

 illustrates how the meatus auditorius has arisen by the emargination and 

 excavation of the posterior part of the cranial roof of the Cotylosauria. 

 In the other families the access of the internal ear to the external 

 median is closed by the thin temporal roof. 



Char, specif. — Established on a cranium with lower jaw in place, 

 which lacks the left half posterior to the orbit, and a piece from the 

 middle of the right side. Both nostrils and a part of the border of the 

 left orbit are preserved, together with the teeth as far posteriorly as the 

 orbit, the premaxillaries imperfectly. A large part of the palate is pre- 

 served. The teeth ])reserved show that the premaxillary teeth are small 

 as in the Isodectes megalops, and that they increase in length posteriorly. 

 The maxillopalatines are excavated on the median line so as to present 

 two parallel ridges which continue as far as the posterior border of the 

 internal nares. These ridges probably continue on the palatine bone 

 and they support each a tooth near the posterior extremity. In Isodectes 

 megalops the i)alatines support numerous small teeth on their inner 

 borders. I find no trace of the interior rows of maxillarj' and mandi- 

 bular teeth which are characteristic of the PariotichidiTe. Some such 

 teeth may, however, have existed, as a portion of the maxillaiy bone is 

 wanting from both sides of the skull. 



This species is seven or eight times the linear dimensions of the 

 Isodectes megalops, and a little smaller than the Otocmlus testudineus. 

 The skull is as wide posteriorly as it is long, and is rather depressed, so 

 that the orbits and nares liaA'e a vertical as well as a lateral presentation. 

 The muzzle is flat and projects beyond the lower jaw, and it is rounded 

 in outline, and not narrowed and portuberant as in most of the species 

 of Pariotichus. The internareal and interorbital regions are flat. The 



