Fig. 262. — Evidence for evolution from Comparative Anatomy and 



Embryology. 



A to C, stages in development of the flounder, Pleuronectes, a fish that begins as a 

 symmetrical type and changes during development to one with both eyes on the right 

 side of the body and becomes otherwise adapted for life on the bottom where it rests upon 

 its left side instead of ventrally. D, wnalebone whale, showing bones in flipper like those 

 of fore limbs in typical terrestrial mammals {cf. Fig. IS, p. 39), and degenerate pelvis and 

 hind limbs shown embedded in flesh and on a larger scale above. Plates of whalebone are 

 attached to the upper jaw. Both jaws are toothless in the adult, but there are rudimentary 

 teeth in the embryo. The young are born in the water, but suckled like other mammals. 

 E, seal, another type of mammal adapted for aquatic life although still able to come upon 

 the land, showing skeleton of fore and hind limbs for comparison with same in terrestrial 

 mammals. /, femur; isch, ischium; p, pubis. {A to C, from Ziegler after .\gassiz; D and E 

 from Romanes, "Darwin and after Darwin," copyright, 1896, by Open Court Publishing 

 Co., reprinted by permission.) 



498 



