coPE.l . PALEONTOLOGY MIOCENE PERIOD. 517 



border not augulate bebind. Parapophysis projecting acutely below 

 centram. An elevated neural spine. 



Neurodromicus dors alts, Cope, loc. cit. 



Char, spect/.— Articular surfaces of centrum round ; tbe ball with a 

 slightly upward-looking obliquity. Hypapophysis continued to cup as a 

 prominent carina. A ridge connecting zygapopliyses. Neural spine 

 extending its base forward, so as to stand on the entire length of the 

 neural arch. 



Measurements. 



if. 

 Length of centrum 0.0045 



Diameter of cup, 5 ^*^^*i^^^ " ^^ 



'■ ' \ transverse OO'J I 



Elevatiou of neural spine above centrum 0055 



Elevation of neural spine above neural arch 0029 



Length of hypapophysis below centrum 001 "2 



Width of hypapophysis ^ 0011 



The zygantrum is capacious, and the whole neural arch open and 

 light. The species was about the size of the black snake, {Bascanium 

 constrictor.) 



Calamagras, Cope, loc. cit. 



Char. gen. — An obtuse hypapopliysial keel most prominent posteriorly. 

 Ko ridge from the zygosphene; that from the parapophysis wanting or 

 rudimental. Neural spine posterior, short, and obtuse. Neural arch 

 not produced posteriorly; zygosphene wider than articular cup. Artic- 

 ular surfaces moderately oblique. A concavity separating the articular 

 surfaces of the diapophysis and parapophysis. 



This genus differs from Boavus, as described by Marsh, in the absence 

 of ridges and concavity of parapophysis. 



Calamagras MURIVORUS, Cope, loc. cit, p. 15. 



Char, specif. — Articular surfaces a broad transverse ellipse. Hyjiapo- 

 physis terminating in an appressed point. No inferior lateral ridge on 

 centrum ; a trace of one on the posterior part of neural arch. 



3i€asurements. 



M. 



Length of centrum O.OOIjO 



Width of ball 0017 



Depth of ball -■- .0013 



Width between jiarapophyses 002:3 



Depth of entire vertebra 0040 



Represented by six consecutive vertebree. Size that of the water- 

 snake, {Tropidonotus sipedon.) 



Calamag-ras truxaxis, Cope, loc. cit.., p. 15. 



Smallei^ Articular surfaces more oblique. Neither centrum nor arch 

 with ridges; hypopophysis low, without apical point. Parai^ophysial 

 surface very short vertically. 



Measurements. 



M. 



Length of centrum 0.0027 



Width of ball 0016 



Depth of ball 0011 



Width between parapophyses 0020 



Depth of entire vertebra -0004 



Size of the garter-snake ; four vertebrje preserved. 



