244 KANSAS UNIVERSITY SCIENCE BULLETIN. 



terial has led me to regard the remains as a new species, 

 which may be very appropriately named Eryops willistoni as 

 a partial expression of gratitude to my honored preceptor in 

 paleontology. Since, also, several interesting points in 

 anatomy and morphology have come up for consideration the 

 following discussion is presented in the hope of adding some 

 knowledge on this peculiar Permian genus. 



The material which represents the present species comprises 

 the following portions of the skeleton : Portions of the skull ; 

 several teeth and a nearly entire right mandible; the scapula- 

 coracoid of both sides, incomplete; the right clavicle; portion 

 of the interclavicle ; right humerus, radius, ulna and a 

 phalange ; about a dozen vertebrae and the left sacral rib. 



There are various fragments of the skull preserved. On one 

 of these fragments is observed a portion of the right orbit and 

 a part of the prefontal and frontal bones clearly marked off 

 by sutures. The present form differs in this respect from the 

 known specimens of Eryops megacephalus, in which the sutures 

 remained unknown until they were discovered by Doctor 

 Branson, who was able to trace them with the aid of a lens. 

 On the present specimen the sutures stand out with almost 

 startling distinctness. They do not have the sharply zigzag 

 form assumed in E. megacephalus and other of the larger 

 Amphibia, but the sutures occur in bold curves. I detect a 

 portion of the supraorbital lateral line canal on the fragment 

 containing the orbit. The sculpture of the cranial bones in the 

 present form is quite different from that of E. megacephalus. 

 It is much more rugose and the rugosities have a larger form.. 

 This holds true for the mandible also (plate XLIX, fig. 1), and 

 it is taken as one of the specific characters. 



There are preserved in the collection also a single complete 

 tooth and fragments of others. The complete tooth (plate 

 XLIX, fig. 2) is of the typical labyrinthodont form. It is oval 

 in cross section with sides flattened. It arises from a tumid 

 base of cancellated bone as in the mosasaurs. It is recurved 

 and sharply pointed. 



In 1899 Ludwig Strickler (Paleontographica Bd. XLVI, p. 

 85, plates XI, XII) investigated the minute structure of the 

 teeth of Eryops megacephalus. 



The mandible of the present species is preserved in a much 

 broken condition, but its form is nearly complete. The form 

 and ornamentation of the posterior portion were well shown in 



