Cope.] 44:4: [-^sfQ^ 15^ 



latter, and it is probable that the premaxillaries display corresponding 

 enlargement. The type of Ectocynodon {E. ordinatus Cope) is in the 

 same condition as regards teeth of the premaxillary series, but a long tooth 

 is present near the mandibular symphysis, so that the characters are so 

 far tliose of the other species referred here. The elongation of the max- 

 illary tooth is more conspicuous than in the P. brachyops. In general this 

 tooth is not absolutely very large, but the teeth anterior and posterior to 

 it are small or very small. 



Besides the usual series of teeth on the maxillary bone, there are two or 

 more series adjacent. In like manner on the mandible, besides the den- 

 tary series, there are two or three series, perhaps on the splenial bone, 

 standing on a ledge in the same horizontal plane as the tooth-bearing 

 edge of the dentary. 



In this genus, and probably in all the members of the family, the palate 

 is roofed over posteriorly by the palatine bones. The pterygoids diverge 

 early from the presphenoid region towards the zygomatic border, as in 

 Batrachia generally. The mandibular articular surface consists of two 

 cotyli placed transversely. Theos tabulare is small, and is situated, as in 

 other genera of the family, near the posterior junction of the supramastoid 

 and supratemporal. The supraoccipital forms a narrow strip at the pos- 

 terior border of the sviperior plane of the skull. The arrangement of the 

 cranial bones is as I have described in the genera Isodectes and Pantylus,* 

 except that the prefrontal and postfrontal bones scarcely meet over the 

 orbit, instead of separating the orbital border from the frontal. The 

 occipital condyle, as in Empedias, is prominent, and has a median fossa. 



In Pariotichus agiiti the vomers are elongate posteriorly and the pala- 

 tines send an acute anterior process between them. The palatines are 

 separated by a fissure which is narrow anteriorly and becomes wider pos- 

 teriorly. Each interior border bears on its posterior two-thirds a row of 

 small teeth. In this respect this genus differs from Empedias, where the 

 palatines are closely appressed on the middle line. The suture between 

 the palatines and the ectopterygoid is not easily made out, but this region 

 descends below the maxilhiries to opposite the middle of the inside of the 

 mandible as in many Lacertilia. Jtist anterior to the oblique angle which 

 marks this descent a ridge of the palatines extends forwards and out- 

 wards, and for a short distance bears a row of teeth. These teeth, like 

 those of the internal palatine series, are in a single row, differing in this 

 respect from the species of Pariasaurus as described by Seeley, where 

 they are in two rows. The positions of the rows are the same in the two 

 genera. The posterior border of the (?) ectopter^'goid supports a patch 

 of teeth in several rows. They are much less developed in Pariasaurus. 



The pterygoids are slender and diverge from the interior part of the 

 palatines outward, backward and upward, to the inner side of the quad- 

 rate. They bear no teeth. The sphenoid is deeply grooved on the mid- 

 dle line as in Elginia. Its lateral inferior keels project below the plane 



* Trans. Amer. Philos. Soc, 1892, p. 14, PI. i. 



