Cope.] 4Ub [June 19, 



Char, specific. Scales in their present condition with entirely smooth 

 surface. At a distance of .20 m.m. from the base of the tail they are in 

 twenty longitudinal series. At that point the transverse diameter is 140 

 m.m. The outline contracts rather abruptly to the tail, of which 750 

 m.m. are preserved. The surface of the tail is obscured by a thin layer of 

 carbonaceous matter not sufficiently thick to obscure scales ; but no scales 

 appear. The body, or such part of it as is preserved, measures 900 m.m. 

 in length. The cephalad half of the body is depressed and somewhat dis- 

 ordered ; the caudad half is well preserved. Where the undisturbed por- 

 tion commences the width is 150 m.m. The diameter of the cup of a sup- 

 posed vertebral centrum is 1.6. m.m. 



A tooth of Pleurncanthus compressus Newb. lies close to one edge of the 

 body. 

 Discovered by Samuel Huston. 

 Anisodexis enchodus, sp. nov. 



The generic characters are apparent in the very unequally sized teeth 

 with round section. The portion upon which the species is based is a 

 part of the right ramus of the mandible, which is in the specimen viewed 

 Irom the inner side. The jaw is obliqely and smoothly truncate from be- 

 low, for the symphysis and the surface of the bone is smooth. There is 

 a very large tooth near the extremity of the dentary bone. Behind it ia 

 an interval equal to three times the diameter of its base, which is followed 

 by a tooth of about one-third the length of the first tooth. Posterior to 

 this one are two teeth of the same size as the second, all being separated 

 from each other by about a tooth's diameter. These are followed by three 

 sub-equal teeth of about two-thirds the length of the first tooth, and sep- 

 arated by about their own diameter from each other. They are all per- 

 fectly straight, very acute, and without trace of a cutting edge. The 

 inflection-grooves extend to or a little beyond the middle of the length. 



Measuremerds. M. 



Length of jaw including seven teeth 031 



Depth of ramus at second tooth Oil 



Length of first tooth 0105 



" third tooth 004 



" sixth " 0075 



The type of the genus is Anisodexis imbricarius from the Permian beds. 

 The present species is very much smaller, and the apices of the teeth do 

 not display the opposite cutting edges seen in the A. imbricarius. 

 Discovered by Samuel Huston. 

 Ceraterpeton divaricatum, sp. nov. 



This species is represented by a skull whose superior surface is visible 

 on a block of coal shale. In size it exceeds that of the other two Ameri- 

 can species, the C. punctoUneatum, and C. tenuicorne. Its epiotic horns 

 are of the straight acute type of the latter species, and its sculpture is also 

 different from that of the G. punctoUneatum. 



