17 



Measurements. M. 



Santero-posterior 0875 

 vertical 0750 

 transverse 0500 



Vertical diameter of diapophyses 0500 



Transverse diameter of neural spine between posterior zyga- 



pophyses 0500 



Depth mandibular ramus at front of quadrate cotylus . .0800 



Scapherpeton laticolle, sp. nov. 



"Vertebrae of several individuals of smaller size than those 

 referred to the S. tectum differ' in the less extensive development 

 of the roof connecting the anterior zygapophyses, and the greater 

 compression of the centrum, in consequence of the downward pro- 

 duction of the inferior keel. The neural arch is openly notched 

 between the anterior zygapophyses, but the notch is bounded by 

 a recurved lamina distinct from the zygapophyses. The dia- 

 pophyses are much as in S. 'tectum.; the riclge from the inferior 

 portion of it is quite prominent, and includes with the base of the 

 neural arch a deep fossa. 



Accompanying a dorsal vertebra like those of this species, and 

 probably belonging to the same skeleton, is an atlas of a more 

 depressed form than those presumably belonging to the other 

 species. The median tuberosity is well developed, constricted at 

 the base, and much flattened. The condyloid facets are narrow 

 and transverse. 



Measurements. m. 



Santero-posterior . . . .070 

 vertical 050 

 transverse 030 



Width of the neural canal 020 



Vertical diameter of base of diapopbysis .... 030 



If it should appear that the dorsal vertebrae do not represent a 

 species distinct from the S. tectum, the S. laticolle may rest on 

 the atlas described. 



The limb bone above mentioned is associated with the neural 

 arch of a vertebra of the character ascribed to this species. Both 

 extremities are eroded so as not to display the forms of the con- 

 dyles, though almost the entire length is preserved. The tro- 

 chanter is imperfect, but its base is that of a subcylindric process. 

 The head of the bone is subtriangular, and the section of the 

 2 



