Cope.] bJiJi [April 5, 



of the premaxillary bone does not display any cutting edges nor facets. 

 The grooves of inflection are strong, and extend well towards the apex, 

 but they are not numerous. 



Measurements. M. 



Length of skull from muzzle to epiotic angle 100 



" •' " supraoccipital 090 



" " " front of orbits 045 



" " " nares (axial) 012 



Width of skull at extremities of quadrates 083 



" " between epiotic angles 035 



orbits .015 



" " at front of orbits 066 



" between nares 015 



Long diameter of orbit 025 



From the same locality and horizon as the last species. 



Cricotxjs heteroclittjs Cope. 

 Proceed. Academy Philada., 1876, p. 405. American Naturalist, May, 

 1878 (published April 22d), p. 319. 



Specimens of a number of individuals probably referable to the above 

 species, exhibit many of its characters. These are very remarkable, and 

 indicate another type of vertebral column heretofore unknown. 



The intercentra are more largely developed than in any other genus, 

 having the form and proportions of the centra in the caudal region, and 

 being but little smaller in other portions of the column. In the prepelvic 

 region, the true centra only bear neural arches, which are articulated, and 

 bear short diapophyses at their base. On the caudal region they share the 

 neural arches with the intercentra, while the latter bear the continuous 

 chevron bones exclusively. The neural spines are well developed, and not 

 prolonged, in both regions. The ribs are robust, and the abdomen is pro- 

 tected beneath by a series of long, narrow and flat scales, which form im- 

 bricated chevrons directed forwards at the middle line. 



The phalanges are short and wide, with but slightly condyloid articula- 

 tions. The distal one is very short, and terminates in a narrowed obtuse 

 projection, somewhat like those of man, but shorter. 



A cranium which accompanied the portions of the trunk above described, 

 may belong to the same species. It is that of a Labyrinthodont in some 

 degree allied to Trematosaurus. Its form is elongate and the orbits are 

 behind the middle. The mandibles do not exhibit prominent angles, and 

 the epiotic angles are not distinguished by a notch from the posterior bor- 

 der of the os-quadratum. The epiotic bones and two supraoccipitals form 

 the posterior boundary of the table of the cranium ; anterior to which the 

 usual parietals and pterotics extend to the frontals and post-frontals. Be- 

 low the latter is the postorbital, which is bounded behind by the squamosal 

 (supra-squamosal, Owen, Palaeontology, p. 176). The quadrato-jugal is, 

 possibly distinct from the large malar. There is a " lyra" of two grooves, 



