124 EVOLUTION AND DISEASE. 
rately localize pricks from a pin made upon the parasite. — 
Although the parasite seemed to possess independent — 
reflex centre, it had no power of spontaneously moving 
the limbs, neither had the autosite any control over them. 
Fic, 69.—A Green Lizard (Lacerta viridis), with dichotomy 
of the tail. 
Parasitic foetuses similar to Ake and Lalloo and the 
calf occur in cats, dogs, and lambs. In such cases the 
nature of the abnormal appendage is obvious enough, 
but in cases where the growth of the second embryo 
