CONSPECTUS OF THE ORGANS MENTIONED IN 
THE TEXT, ARRANGED ON THE BASIS OF 
THEIR PHYSIOLOGICAL CONDITION | 
I. ORGANS SHOWING RETROGRESSIVE 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 palpebre superioris. 
Intestinal ccecum. 
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 embrycnic notochord and associated somites. 
