96 



THE GENESIS OF SPECIES. 



[Chap 



allied to the sloth, iiainel}', the great ant-eater (Myrme- 

 cophaga), we have again an ornithic ciiaracter in its hornj' 

 gizzard-like stomach. In man and the liighest apes the 

 caiciun has a vermiform ap])endix, as it has also in the 

 wombat 1 



Upper Figure — Antechincs minctissimus {imjdacental). 

 Lower Fij,'ure — Mua delioatulub (plueeiital). 



Also the similar forms presented by the crowns of the 

 teeth in some seals, in certain sharks, and in some extinct 

 Oetacea, niay be referred to; as also the similarity of the 

 beak in birds, some reptiles, in the tad])ole, and cuttle- 

 fishes. As to entire external form, may be adduced the 

 wonderful similarity between a true mouse [Mtis dellcata- 

 lus) and a small marsuj)ial, pointed out by Mr. Andrew 



