THE EOREST-BED OE EAST ANGLIA. 



103 



III. Atlas. (Nearly complete, but wanting the end of the left transverse process. The 

 second series gives the measurements of the articulated specimen of O. gigantcur, 

 (Irish) in the Woodwardian Museum at Cambridge.) 



Centrum, greatest length of , 



Neural arch, length in median dorsal line 



Greatest width of vertebra (estimated at twice the width of the 



perfect side) 



Width between outer edges of facets for condyles of skull 



Width between outer edges of facets for odontoid process 



Front edge of facet for condyle to middle of lateral part of facet for i 



odontoid process J 



Tip of neural spine to a point vertically below it on the ventral i 



surface of the centrum J 



Tip of hypapophysis vertically to the level of the hinder edge of "i ^ 



the neural arch in the middle line f 



Deepest point in the depression behind the ventral nerve-foramen i 



to the dorsal edge of the facet for the odontoid process J 



Width of centrum between the two depressions l-9-2'l 



Width of neural canal, in front 1"7 



„ „ „ behind 1-7 



Vertical height of neural canal, in front 12 



behind 17 



102 



4-5 



115 



IV. Axis. (Practically complete.) 



Gt helyrandi 



(Pakefield). 



inches, millim. 



Centrum, greatest length (without odontoid process) 4-4 112 



„ „ (with „ „ ) 5-4 137 



Neural arch, length at the top of the neural canal 4-0 102 



„ spine, length of 5'0 127 



Eacet for atlas, width of 3-9 100 



Odontoid process, width at tip 1'6 40 



Top of neural canal to bottom of facet for atlas 2-9 74 



Length of facet for anterior zygapophysis of 3rd vertebra 1"6 40 



Greatest vertical height (at hind end) 5'4 137 



„ width (near hind end) 4-0 102 



Post-erior zygapophyses, width across 3-0 76 



Posterior end of centrum, vertical height of articulating surface . . 1-9 48 



Top of neural spine to top of neural arch ^'4 ol 



VOL. XV. — PAKT IV. No. 3. — Becemler, 1899. 



3-6 



92 



