AMERICAN LABYRINTHODONTIDM 595 



Von Huene refers Eupelor, Pariostegus, and Dictyocephalus to 

 the Temnospondyli, but their relationships, so far as can be made 

 out from the fragmentary material known, are with the Stereospondyli. 



In 1897 Dr. Williston described 1 a large labyrinthodont tooth 

 from the upper part of the coal-measures near Louisville, Kansas. 

 This tooth is as large and complex in structure as the large fangs 

 of Anaschisma. The animal to which it belonged was probably 

 one of the true Labyrinthodontidas. The species was provisionally 

 referred to Mastodonsaurus. 



SOME NEW FACTS ABOUT ERYOPS 



In the collection of vertebrate fossils of Walker Museum there is 

 a specimen of Eryops of great interest from the Permian of Texas. 

 It consists of an almost complete skull, a large number of vertebrae 

 in association, the pectoral and pelvic girdles, and some limb bones. 

 Most of the sutures in the roof of the skull are distinct; the under 

 part and base of the skull are in a splendid state of preservation, 

 and the characters of the sacral and presacral vertebras are well 

 displayed. 



The writer has studied Cope's types of Eryops, and the present 

 specimen is congeneric with them. It differs widely in three important 

 characters from Eryops as restored by Broili: 2 the pterygoids do not 

 meet in the median line; the prevomers are very large; the palatine 

 foramina are small. Cope's types show these characters definitely, 

 and the pterygoid region of twelve other skulls studied during the 

 present investigation show that the pterygoids do not meet in the 

 median line. 



Skull. — The skull has been distorted by pressure, the right side 

 being flattened, while the left side is pushed to the left at the top, 

 and the lower margin crushed inward. A small part of the quadra- 

 tojugal on each side, a part of the premaxillae from the region of 

 the maxillary foramen, some of the jugal, prosquamosal, postfrontal, 

 and prefrontal of the left side, and a little of the squamosal and 

 postorbital of the right side are missing. 



1 Kansas University Quarterly, Vol. VI, No. 4 (1897), p. 209. 



2 Paleontographica, Vol. XLVI, Plate VIII, Fig. 1. 



