:',or, 



\'Ki;tki!I!Ate animals. 



flight. Tlie wings are long ;iiid pointed, the sternal keel is greatly 

 developed, the jjectoral muscles are of large size, and many of them 

 exhibit jMiwers of locomotion more lajiid tljan those enjoyed by any 

 other members of tile animal kingdom. 



SUB-CLASS in. ODOXTOl^XITHES. 



( )RDER I. SaI'RUR.K. 



This order includes only the single extinct Bird, the Ari'liceopten/x, 

 "svhich h.-Ls been found in the < lolitic rocks of (iermany. The An.-hw- 

 ujifrri/j; was about as biig as a common Rook, and shows many singular 

 poi)its of resemljlanee to the true Eeptiles. It ditt'eis from all living 

 binls in having two free claws to the wing, and in possessing a lont' 

 lizanldike tail. Instead of the jiloughshare-shaiied bone which ter- 



Ar.-lKeojilMw. T;.il :\u'\ .Ichirlif.l lii.iif.s. 



min;ites the tail in living birds (hg. l'I)4, B), the tail ill J;v/«co///c/')/.r 

 (iig. liiO) is \-.-ry long, and consists ,,( a.bont twenty distinct and 

 sp|,arat.- ^■crl.d n-r, cacli of «|iirli sn|iports .a ]);iir ..f iiuill-feathers. 

 The tail, (hcrcfoiv, ,.xrc|,t f,,i' Ihe pivsencc of fealhers, nnist ha\-e 

 be,^n vei-y lik^-t!i;,( of ,-, IJrptile. ,A s in ;i|| the Birils ,,f (his sub- 

 class, the j::w,; wciv finiiished with coiiicd pointed teeth. 



(>::oi:it II. ( )iH,NToir -,:. 



This order com]ii'ises ..iily a single exliiid binl, the exiraordinary 

 Jrr:y,rr„n,;s ,-,y/„//.s. of |1„. (Velaceoiis rocks of N,,rlh .Americ:., f..r 

 the disrrnvry :iiid description of whc-h science is indebted to I'ro- 



