Tope.] ^J-^ [April 5, 



Measurements. M. 



Elevation of base of neural spine 083 



Width of apex " " " 025 



Vertical extent of extremity of diapophysis 036 



^ . _ ( antero-posterior 026 



Diameter of centrum J Ar> „ 



(_ transverse 027 



Width between inferior extremities of tubercular facets 



of diapophyses 066 



Width between extremities of zygapophyses 082 



Length " " " " .042 



No. 2, a larger individual. 



Total elevation 130 



f antero-posterior 029 



Diameter of centrum < transverse 043 



( vertical 039 



Extent of zygapophyses 102 



Elevation of neural spine 026 



The portions of the vertebral columns referred to this species cannot be 

 reconciled with those of any of the species of Epicordylus or Glepsydrops. 

 In both of these, large parts of the dorsal series are known, and even if those 

 genera should possess dorsal vertebrae with hyposphen, which is very im- 

 probable, the peculiar forms of the zygapophyses and neural spine will 

 still distinguish them widely. 



Embolophokus fkitillus. Gen. et sp. nov. 



This form reposes on some dorsal vertebrse with intercentra and ribs in 

 place, which display some interesting characters. The neural arch is co- 

 ossified, and the zygapophyses and diapophyses are well developed ; the 

 latter not elongate, and standing on the base of the neural arch. The cen- 

 tra are notochordal. The intercentra are narrowed and transversely ex- 

 tended. The ribs are two-headed ; the capitulum is received into a fossa 

 of the posterior border of the intercentrum in advance of the vertebra 

 which supports the diapophysis, to which the tuberculum is attached. 



The curious mode of articulation of the ribs I have not observed in the 

 species of the genera heretofore described, unless the forms of some of the 

 intercentra of the Clepsydrops limbatus indicate it. If so, that species must 

 be removed to Embulophorus. 



Char. Specif. Centra with a circular section at all points, and contract- 

 ed at the middle. No carinae or grooves. The intercentra project beyond 

 tne edges of the centra, giving the column the appearance of supporting 

 annular ridges. Their lateral angles extend upwards nearly to the base 

 of the neural arch: The diapophyses are short and are directed upwards 

 and forwards ; their extremities ai - e concave. The zygapophyses are large 

 and their articular faces nearly horizontal. The size of this species is 

 small, little exceeding that of the Bolosaurus striatus. 



