No. 5.] PARIOTICHUS INCISIVUS COPE. 233 



mandibular symphysis, so that the characters are so far those 

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

 illary tooth is more conspicuous than in the P. bracJiyops. 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, 

 beside the dentary series, there are two or three series, perhaps 

 on the splenial bone, standing on a ledge on 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 toward the zygomatic 

 border, as in Batr'achia generally. The mandibular articular 

 surface consists of two cotyli placed transversely. The os tab- 

 ulare is small, and is situated, as in other genera of the family, 

 near the posterior junction of the supramastoid and supratem- 

 poral. The supraoccipital forms a narrow strip of the posterior 

 border of the superior plane of the skull. The arrangement of 

 the cranial bones is as I have described in the genera Isodectes 

 and Pantylns, 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 Empcdias, 

 is prominent, and has a median fossa. 



*Tn ParioticJms aguti the vomers are elongate posteriorly and 

 the palatines send an acute anterior process between them. 

 The palatines are separated by a fissure which is narrow ante- 

 riorly and becomes wider posteriorly. 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 maxillaries to opposite the 

 middle of the inside of the mandible, as in many Lacertilia. 

 Just anterior to the oblique angle which marks this descent a 

 ridge of the palatines extends forwards and outwards, 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 



