276 



vi:iitf.i;i;ate aximai.s. 



geniiino reptiles. The only liviii,;; Reptile wliieli lias miy power of sustaining 

 itself in the air is the Flying Dragon (Drarv), which has been previously nien- 

 tione.l. In this ease, hoivever, the animal has no power of true flight, hut is 

 simply enabled to take extensive leaps by means of a membranous expansion 

 on eaeli side of the boily. In the Bats, again, the power of genuine flight is 

 present; and this given by means of a leathery membrane which is supported 

 chiefly by certain of the Angers— which are greatly lengthened— and is attached 

 to the sides of the liody and hinil-liml)S. 



In the Pterodactyles the power of true flight was present ; and this was also 

 conditioned by means of a leathery expanded membrane, attached to the hinil- 

 lindw, the sides of the body, and the foredimbs. In this case, however, the 

 chief support of the flying membrane was derived from the ontermost finger 

 of the fore-limb, which" was enormously elongated (fig. 200). That the Ptero- 



Oolitr). Ill ;m 

 arc ticrc rrroii 



■////,. 



Fn nil the Litlingi'apliic 



vim- ,Mi:4ili:dlv ciilflta 



nleuhi 

 li-its . 



t'eiuUpper 

 if tlie hand 



dactylc 



tree to 



birds. 



hollow 



many 



nishcd 



miis.lc 



Ptcio.l, 



atlaiiir 



of win;. 



feet IVi 



id w 



; ]iassc<l their cxislcncc chicriy in the air, and did not simply leap) from 

 by two idiar.icters in which they agree with the flying 

 'line's, namely, were " }ineuniatic '* — that is to say, were 

 cd wiih air. Secondly, whilst the shoulder-girdle has 

 ■rs of tliat of liirds, the breast-bone (sternum) is fur- 

 iit liduT Mr Icecl. serving Ibr the attachment of the great 

 ic \vings. 'i'lieic c;iM lie no donlit, therefore, as to the 

 eiijo^'ed the )iio\eT iii' genuine flight. Many of them 

 lint some ol'llicm must lia\e been gigantic, tlie exjianse 

 s lia\'ing been calculalcd a( iirobably alioiit twenty-seven 



tree 

 .Ma 

 I an 

 if 111. 

 wilh 

 ^ whii 



lct\]L 



SlHUVIl 



.!■ the 1 



ere iilli 



cliar;n;li 



{iT'iimiiii 



work I ] 



ha\ing 



cut size, 



c spcci,., 



" tip. 



