54 AMPHIBIA AND PISCES OF THE PERMIAN OF NORTH AMERICA 



In the Batrachian genus the ribs are free from and not in contact with the 

 carapace, and the inferior stratum of the latter consists of the expanded 

 neural spines." 



Revised description: Cope was in error in his separation of the two forms, 

 Dissorhophus and Otoccelus; the character of the carapace in both is as 

 described in Dissorhophus, and the genus Otoccelus is dropped. 



1. Small, not over 500 centimeters long. 



2. Skull not elongate, elevated, resembling in general proportions 



that of Diadectes. Orbits large, in the middle of the skull, 

 looking laterally. Otic notch represented by a large fenestra. 



3. Nares nearly terminal. 



4. Parasphenoid a slender rod. 



5. One tusk in each prevomer and palatine. Maxillary and man- 



dibular teeth small, sharply conical. 

 6. ? 



7. Dorsal vertebrae with the neural spines expanded into narrow 



plates overlying the back. Narrow dermal plates overly- 

 ing and alternating with the neural spines, extending the 

 full width of the body, with an elongate shield in front 

 covering several vertebrae; rugose above. 



8. Ribs double-headed anteriorly; without posterior prolongation. 



9. Cleithrum present, less expanded and thicker. 

 10. Scapula much expanded antero-posteriorly. 



Conodectes is distinctly reptilian in the structure of the palate, and has 

 recently been shown by Williston (Journ. Geol., vol. xix, 1911, p. 232) to be 

 very similar to Seymouria. 



Dissorhophus multicinctus Cope. 



Cope, D. multicinctus. Am. Nat., vol. xxix, 1895, p. 998. 



D. articulatus, Am. Nat., vol. xxx, 1896, p. 936, pi. xxi. 



D. articulatus, Proc. Am. Phil. Soc, vol. xxxv, 1896, pi. x. 



0. testudineus. Am. Nat., vol. xxx, 1896, p. 399. 



0. testudineus. Am. Nat., vol. xxx, 1896, p. 936, pi. xxii. 



0. testudineus, Proc. Am. Phil. Soc, vol. xxxv, 1896, p. 126. 



0. mimeticus, Proc. Am. Phil. Soc, vol. xxxv, 1896, p. 128. 

 Williston, D. multicinctus. Bull. Geol. Soc. Am., vol. 21, 1910, p. 278. 

 D. multicinctus. Journ. Geol., vol. xviii, 1910, pp. 525-536. 



Type: The same as the genus. 



Original description: "As to specific characters it is to be remarked that 

 the intercentra are longer in proportion to their width than in the Trime- 

 rorhachis insignis. The heads of the ribs have a small, free, truncate angle 

 below their capitulum. The extremities of the transverse processes are 

 free from each other for a short distance, and each has a depressed rounded 

 sharp edge. The dermal bands above them terminate a little proximal of 

 them and in a similar manner, and their extremities are closely appressed to 

 the surface of the band below them, with which they slightly alternate. 

 Their surface is very coarsely rugose, with ridges and fossse, whose long axes 

 agree with those of the segments. This species I propose to call Dissorhophus 

 multicinctus. Length of ten vertebrae in place, 93 mm.; width of intercen- 

 trum, 16; length of do., 9; elevation to roof, 30; thickness of carapace, 8; 

 width of a carapacial band, 9; length of do. on curve, 75. This species 

 appeared to have been about the size of the Japanese salamander Megalo- 

 hatrachus maximus." 



