ANIMAL. ANOMALIES 



661 



and two medullas. There was a spinal cord in each of the two backs. 

 A third or median eye was present on a ventral stalk beneath the 

 third or transverse lobe of the cerebrum. Two pairs of kidneys, two 

 bladders, four ovaries, double sets of oviducts and uteri, as well as 



Fig. 359. — Conjoined human twins showing single hips but double trunk and 

 head. (Redrawn and modifled from Arey, Developmental Anatomy, published by 

 W. B. Saunders Co.) 



a double cloaca, were present. There was a single but modified 

 heart and two aortas leaving it. Externally the animal had two 

 sets of limbs, two tails, two sets of mammae, two anal apertures, 

 and two urinogenital openings. 



