252 S. W. WILLISTON NEW GENERA OF PERMIAN VERTEBRATES 



of at least as many more, judging by the two or three blocks that have 

 been so far worked out. How many more remain to be secured the pres- 

 ent season I can not even conjecture. We anticipate as much more mate- 

 rial as we already have. 



ASSOCIATED VERTEBRATES 



Not many different kinds of animals are represented by the remains 

 so far examined. The great majority of the skeletons belong to the genus 

 Varanosaurus Broili. Another genus of reptiles, very clearly new to 

 science and of about the same size as Varanosaurus — that is, 4 feet in 

 length — is represented by fewer remains, but still sufficient, it is confi- 

 dently believed, to furnish the complete structure of the creature. So 

 far, of this form, the complete hind legs and feet, pelvic girdle, and tail 

 have been worked out, and two skeletons are running into the block 

 matrices. Its restoration and description will be published as soon as 

 possible. A third genus of reptiles, also new to science, represented so 

 far by a femur, which is described and figured (plate 16, figure 5) in 

 the present paper as Desmospondylus, was also found. All the amphibian 

 remains so far obtained belong to the present genus Cacops, and consist 

 of the nearly complete skeleton shown in the restoration in plate 17, 

 together with another skeleton less complete, portions of two other skele- 

 tons and skulls, and various remains of less moment found in the top- 

 most layers. I doubt not that the present material on hand will disclose 

 additional skeletons of this genus more or less complete. One skeleton 

 of Varanosaurus. complete from the tip of the tail to the back of the 

 skull, has been completely worked out and figured in 20 plates. An addi- 

 tional skull of another skeleton still leaves some details to be determined, 

 doubtless to be found in other skeletons and skulls yet in the matrix. 

 The full description, with figures and plates of the skeleton of this form, 

 Avill follow the present paper within a year. 



The skeleton of Cacops, as shown in plate 17, is composed exclusively 

 of one specimen, with no more plaster in its construction than was neces- 

 sary to cement the freshly broken parts in its preparation, save of many 

 of the phalanges, as is described further on. The specimen was not only 

 prepared by Mr. Miller, but was skilfully mounted by him in the course 

 of a couple of months' labor. It is doubtful whether another type of 

 fossil vertebrate animal of the size of this is represented by as complete 

 material as is Cacops aspidephorus. 



