/'> 



376 



ZOOLOGY 



SECT. 



(q.v.). The vertebrae' are proca^oiis, except the caiidals, \\hich are amphi- 

 cd'loiis. 'I'he cervical vertebne are eloiigatcil and stout, the neck being of 

 considerable length ; there are three to six ankylosed sacrals. The anterior 



Fig. lOlS.— PterodactylUS spectabilis. Tluoe-fourtbs of the natural size. (From Zittcl, 



after 11. V. Mayer.) 



thoracic ribs are bifid at their vertebral ends. The sternum is broad, with a 

 longitudinal keel. The skull (Fig. 1019), set on the neck at right-angles as 

 in a Bird, is of large size and superficially reseinljles that of a Bird in general 

 shape, and particularly in the presence of an elongated, pointed rostrum ; the 



Fi. 



lOl'.i. - Skull ' 

 luaxilla 



>f Scaphognathus. 



S. liusal (ijieliiiig ; I'l/u: 



J). i>i'c-orl>ital aiKi-ture ; i",-. frontal ; ^cjiigal; Mx. 

 prciiiaxilla ; Qi(. (nmdralc. (After Zittel.) 



orbits are large, and contain a ring of sclerotic ossifications. The sutures are 

 olilitcrated, as in the skull of a Bird. The quadrate is immovably fixed to the 

 skull. In the pectoral arch the scaj)ula and coracoid are long and slender, like 

 those of Birds : procoracoids and clavicles are absent. The pelvis and hiud-limba 



