bo 
MR. W. P. PYCRAFT ON THE MORPHOLOGY AND 
pophyses may form a ring; diapophysial lamella extending towards 
postzygapophysis, large and conspicuous or extremely so; cervical ribs 
moderate or small; sacro-caudal (post-sacral) slightly raised dorsad of 
ventral margin of acetabulum ; cervical vertebre fifteen. 
ec’. Total number of vertebre from forty-five to forty-seven ; post-synsacral 
vertebre three; pre-axial articular surface of atlas scarcely at all 
notched dorsally ; hyperapophyses very long ; a minute hypapophysis 
to atlas; no hypapophysis to axis; neural spine of axis very high; 
hyperapophysis of axis extremely large ; catapophyses commence at 
the fifth vertebra, in the tenth and eleventh vertebre they form a 
ring ; hypapophyses developed from the twelfth cervical to the third 
thoracic vertebra; diapophysial lamella extremely large and con- 
spicuous, developing conspicuous postaxially extending processes ; 
cervical styliform ribs small ;: thoracic and lumbar neural spines 
exceedingly extended axially and subequal inf height ; synsacrum with 
sacral vertebrz plainly distinct from post-sacral ; post-sacral bent much 
ventrad of ilia ; free caudal vertebree seven or nine ; pygostyle conical. 
d’, Wyperapophyses of axis moderate; neural spines of cervical vertebrae 
well developed and deeply excavated postaxially ; neural spines of 
fourth, fifth, sixth, and seventh cervical vertebre bifurcating laterally ; 
catapophyses commencing at the fourth vertebra; hypapophyses 
commence at fifteenth (last cervical) vertebra; diapophysial lamella 
extending towards postzygapophysis, large and conspicuous; cervical 
ribs probably moderately long and rather styliform; thoracic and 
lumbar neural spines not much axially extended, and probably not sub- 
equal in height ; synsacrum with post-sacrals not bent ventrad of ilia. 
B. Axis vertebra with a hypapophysis, with or without well-developed hyper- 
apophyses ; cervical vertebre greatly elongated ; neural spines of cervical 
vertebree small or almost obsolete; catapophyses commencing about the 
sixth vertebra; catapophysis never forming a ring; diapophysial lamella 
extending towards posterior zygapophysis, small and inconspicuous; a 
conspicuous fossa on either side of pre-axial part of neural spines either of 
cervical or thoracic vertebra; synsacrum with sacral vertebre plainly 
a ss from post-sacral roeenee 
. Total number of vertebree fifty-six ; cervical consbeee seventeen ; vertebre 
with ribs ten; no lumbo-sacral atcha synsacrum with eight post- 
sacral vertebre ; pre-axial articular surface of atlas with a large dorsal 
notch ; hyperapophyses of atlas moderate ; hypapophysis of axis rather 
small; neural spine of axis moderate ; neural spines of cervical vertebr 
small, but not obsolete; no neural spines bifurcating laterally; no 
neural spines aborted; hypapophyses developed from the eighteenth 
(first thoracico-dorsal) to the twenty-first (first thoracic) vertebre ; 
hypapophyses but little produced pre-axially ; a conspicuous fossa on 
each side of pre-axial part of neural spines of thoracic vertebre, but not 
of cervical; cervical ribs long and styliform; thoracic and thoracico- 
Apieryz. 
Dinornithide. 
