16 



with impressed punetae. The teeth are described here because it 

 is not known to which species they belong. It is, indeed, not 

 certain, but only probable, that they belong to this genus. 



Four atlases preserved indicate two species ; one being more 

 depressed than the other three, and the anterior cotyli therefore 

 more transverse. 



The vertebrae indicate four species. It is probable that they 

 present some pecularities at different points in the same column, 

 the caudals at least differing in some degree from the others. The 

 characters of the species are quite well marked. 



Scapherpeton tectum, sp. nov. 



Represented by a vertebra which is one of the best preserved 

 in the collection. The most prominent specific character is seen 

 in the entire roofing over of the neural canal between the anterior 

 zygapophyses, and in the downward production of the inferior 

 median line of the centrum, and accompanying downward pro- 

 longation of the articular cups. The chordal perforation is at the 

 superior fourth of the vertical diameter of the cups. The neural 

 spine is produced backwards and curved upwards, and is narrowed 

 between the posterior z} T gapoplryses, and is striate grooved on the 

 under surface. About half of the posterior zygapopirysis projects 

 beyond the edge of the cup of the centrum. Immediately below 

 the anterior edge of the posterior zygapophysis, the diapoplrysis 

 begins. It is vertical, of an irregular figure 8 in section, and is 

 directed outwards and backwards. A foramen passes under its 

 middle, emerging a little before the middle of the same horizontal 

 diameter of the centrum. It is joined by another which strikes it 

 from below at right angles. There is a deep notch embraced be- 

 tween the superior part of the diapophysis and the posterior 

 zygapophysis. The neural canal is wider than deep. 



A fragment accompanied this vertebra when found, which resem- 

 bles the articular portion of the mandible. There is no angle 

 projecting behind the quadrate facet, which is oblique, truncating 

 the extremity of the ramus. The lower edge is acute, behind 

 roughened, and a thickening extends along the middle of the inner 

 side of the ramus so far as preserved. The character is that of a 

 Urodele Batrachian. 



