1878.] 50J [Cope. 



symphysis not sutnral, but ligamentous. Terminal mandibular tooth not 

 small. Teeth not faceted, simple. 



This genus, which I suppose to be reptilian, is represented by a speci- 

 men which lacks the posterior portion of the skull ; hence its near affinities 

 cannot be determined. In the character of the cranial sculpture it re- 

 sembles crocodiles, and the Labyrinthodont genera cotemporary with it, 

 and differs from LacertiUa with cranial sculpture known to me. 



Char. Specif. Parietal and frontal regions flat, the latter joined to the 

 maxillary by a rectangular canthus. Interorbital region wide, equal to 

 the diameter of the orbit. Sculpture of vertex in longitudinal series of 

 pits of considerable irregularity. There are ten or twelve such rows be- 

 tween the orbits. The crowns of the teeth are obtuse, and their surface 

 smooth. 



Measurements. M. 



Interorbital width of skull 009 



Width between prefrontal borders 014 



Depth of facial plate of maxillary 007 



" ramus mandibuli at orbit 006 



" " " near end 003 



Length of short maxillary tooth , .0015 



long " " " 0030 



Width " " " 0015 



The skull of this species is about as large as that of the Heloderma sus- 

 pectum. 



Clepsydrops natalis. Sp. nov. 



This reptile is represented by numerous portions of the skeleton, includ- 

 ing a ci'anium, and thus oflers the best basis of information as to the char- 

 acter of the genus Clepsydrops which has yet come into our hands. This 

 furnishes numerous interesting characters, which as found in a single in- 

 dividual furnish a basis of estimation for the entire group. 



Char. Gen., et ccetera. There is no quadratojugal arch, but the zygo- 

 matic and postorbital arches are present. The squamosal extremity of the 

 zygomatic arch descends low on the quadrate as in turtles, preventing 

 mobility of the latter. The quadrate is not prominent in the specimen, 

 and appears to have been a thin bone, as in Ectocynodon. The nostril is 

 large and latero-anterior. The symphysis of the mandible is short, and 

 the premaxillary bones appear to be distinct ; they are separated in the 

 specimen by displacement, with the indication that the junction was 

 sutural. The teeth were of different sizes, and the premaxillaries and' 

 canines are distinguished from the others by their proportions. All are 

 sub-round in section, with more or less defined anterior and posterior cut- 

 ting edges. The premaxillary teeth are larger anteriorly, diminish pos- 

 teriorly, and are separated by a notched diastema from the large canine. 

 The succeeding teeth are of medium proportions. The roots are sunk in 

 deep alveoli. There is no surface sculpture of the cranial bones, which is 

 the character distinguishing the genus Ectocynodon from Clepsydrops. 



