BIRDS 



355 



SUBCLASS I. SAURUR.E (Tailed Birds). 



These forms, found fossil in the lithographic stone of 

 Bavaria, had tails of extreme length, the feathers being 

 arranged on either side of the long tail vertebrae ; and they 



FIG. 150. Skeleton of wingless toothed oirJ (desperornis}. From Marsh. 



had teeth in the jaws. Only two specimens are known, 

 the smaller being about the size of a crow, the other some- 

 what larger. They are called Archceopteryx. 



