250 



GEOLOGY. 



wings of a bat, and the body and tail of a mammal. It 

 was, in some cases, of such enormous size that it meas- 

 ured from tip to tip of the spread wings 18 or 20 feet. 

 Although the general appearance of its wings was like 

 the bat, the arrangement was different. Instead of four 

 extended toes enveloped in skin, as in the bat, the fifth 

 toes only were lengthened, and the skin extended along 

 the side of the body and legs. Its eyes were enormously 

 large, so that it probably could seek its prey in the night. 

 In Fig. 150 (p. 249) you see the skeleton as it was found 

 in one case, and in Fig. 151 it is represented as complete 



Fig. 161. 



and in order, so that you see the relative position and 

 size of the various parts. 



356. A Question in Comparative Anatomy. In Fig. 

 152 we have the Ichthyosaurus, Plesiosaurus, and Pter- 

 odactyl as they are supposed to have appeared in the 

 scenes of the Jurassic age. It has been commonly sup- 



