1918. } A Double Monstrosity in the Chick. 335 
inner side of the neck of the right individual. The carotid 
gives rise to the vertebral artery. Lower down, the innominate 
gives rise to a subclavian, supplying the right fore-limb of the 
right individual. The aorta itself gives off a subclavian which 
supplies the left fore-limb of the right individual. The left 
veins, one from each individual. The post-caval vein thus 
still retains its connection with the sinus venosus, which opens 
into the right auricle. 
Nervous System—On a superficial examination, it was 
found that the medulla oblongata, by division gives rise to the 
two spinal cords, which run through the neural canal of the 
vertebral column of each individual. Unfortunately, the brain 
was not well preserved ; so, it is difficult to say more with any 
egree of certainty. 
In conclusion, I may add that the animal is peculiar in the 
possession and relationship of its various organs. Externally, 
except for the head and neck, the animal seems to be divided 
into two individuals. But this external division has no corres- 
My sincere thanks are due to Mess H. Niblett and 
G. Blanchette of the Anglo-Indian Hostel, Allahabad, for kindly 
presenting the specimen to was born in March 1916 
