Cope.] i-Oy) [May 15, 



narrower brain case is continued between the orbits, and its lateral 

 walls are robust. The palatine bones extend from the raaxillaries, and 

 approximate each other nearly on the median line, where they are 

 separated medially by a groove, which becomes wider posteriori}'. Xo 

 teeth can be discerned in the specimen, excepting the large anterior one 

 already mentioned. The surface of the bone is, however, not in good 

 condition. The plate of the pterygoid extends to the jugal on each side, 

 and its posterior border is but little deflected, and is at right angles to 

 the long axis of the skull, with indications of teeth. The posterior 

 branch of the pterygoid is slender. The occipital region is injured. The 

 superior surface of the skull is sculptured, on the posterior frontal region 

 in a coarse honeycomb pattern, the ridges occasionally forming small 

 tubercles. 



The teeth are conic, acute, and with a round section. In this respect 

 they differ from those of most of the species of Pariotichus, where the 

 crowns are obtuse. They are rather closely placed, and they increase 

 in length to below the anterior border of the orbit. Their character 

 posterior to this point cannot be ascertained. The single, large palatine 

 tooth is similar to the maxillaries in form, and equals in dimensions the 

 maxillary tooth which is below the posterior border of the nostril. The 

 posterior border of the internal nostril marks a point half way between 

 the posterior border of the anterior nostril and the anterior border of 

 the orbit. 



Measurements. >im. 



Total length of skull 158 



Width posteriorly 153 



Width between nostrils 30 



Length from end of muzzle to posterior border of pterygoid 



plate 103 



Width between summits of ridges of vomer 10 



Length from posterior border of nostril to anterior border 



of orbit 41 



Length of longest maxillary tooth 10 



Diameter of longest maxillary tooth at l)ase o.5 



A part of the muzzle of a second individual was found at the same 

 locality. 



DIADECTID.E. 



[ am now able to make some additions to the family of the Diadecti- 

 <1:l'. I omitted also in my recent synopsis* of the genera to inchuk\the 

 genus Plianerosaurus Von Mej^er, from the Permian of Germany, which 

 I had previously referred to this family. f A revision <»1' the species 



* Proc. Amer. Pliilos. Soe., 1895, DecembLT, p. -1-11. 

 t rransac. Amer. Philos. Soc, 1892, p. 13. 



