208 MESSRS. HANCOCK AND ATTHEY 



The ribs are peculiar in form ; they are about five inches long, 

 but we cannot be certain that they are entire ; the shaft is three - 

 eighths, of an inch wide, and is not much compressed ; nor do 

 they exhibit the longitudinal groove so usual in the ribs of these 

 Amphibians. The proximal extremity is exceedingly wide, mea- 

 suring across seven-eighths of an inch ; it is much compressed ; 

 but the capitular margin is thick and continues the curve of the 

 shaft ; it projects a little beyond the tuberculum, and is divided 

 from it by a very shallow notch ; the bifurcation is consequently 

 exceedingly shallow. The tubercular process turns suddenly 

 from the shaft, and, though thin, widens out into a large con- 

 cave articular surface, much larger than that of the capitulum. 



There is, of course, no certainty that these vertebrae and ribs 

 are really those of Loxomma; but, from their occurring in the 

 same locality, and about the same time as the cranium, we may 

 infer that it and they came from the same part of the seam ; 

 hence the probability that they belonged to the same animal ; 

 and, moreover, the ribs differ considerably from those of Anth- 

 racosaurus and Pteroplax, the only other large Labyrithodonts 

 that have yet been found in the Newcastle coal-field. 



VII. — Description of a Labyrinthodont Amphibian, a new Generic 

 Form,, obtained in the Coal-Shale at Newsham, near Newcastle- 

 upon-Tyne. By Albany Hancock, F.L.S., and Thomas 

 Atthey. (Plate IV.) 



The fossil vertebrata of the Coal-shale overlying the High-main 

 Seam at Newsham do not yet appear to be exhausted, notwith- 

 standing the great attention that has been bestowed upon the 

 subject, for many years past, by one of the authors of this paper. 

 In proof of this we have to record the recent occurrence, in 

 the above locality, of two specimens of a small Labyrinthodont 

 skull, differing from anything with which we are acquainted, and 

 of such a peculiar character, that it is necessary to establish a 

 new genus for the reception of this curious species, which we 



