CONSPECTUS OF THE OEGANS MENTIONED IN 

 THE TEXT, AEEANGED ON THE BASIS OF 

 THEIE PHYSIOLOGICAL CONDITION 



I. ORGANS SHOWING EETROGRESSIVE CHARACTERS 



A. Retrogressively modified, the Organs still performing 

 clearly recognisable Functions 



Certain muscles of the lower leg and foot. 



Adductor transversus of the foot. 



Opponens of the ball of the little toe. 



Serratus posticus superior and inferior. 



The flexors proper of the fingers. 



M. pyramidalis (when comparatively well developed as 

 accessory to the rectus abdominis). 



M. levator palpebrse superioris. 



Intestinal coecum. 



Eighth sternal rib. 



The eleventh and twelfth ribs. 



Sternum. 



The fifth toes. 



The fibula. 



Olfactory lobe of the brain and (in part) the olfactory organ. 



The canines and upper lateral incisors ; the molars, in so far 

 as there is a decrease in the number of their cusps. 



The pre-maxillary bone. 



B. Retrogressively modified, the Organs having become wholly or 

 in part functionless, some appearing in the Embryo alone, 

 others present during Life constantly or inconstantly. For 

 the greater part Organs which may be rightly termed 

 Vestigial. 



Os coccygis. Cauda humana. 



Superfluous embryonic notochord and associated somites. 



