
606 THE AMERICAN NATURALIST. [VoL. XXXVI. 
is composed of parts of two ilia incompletely separated, and that 
the hinder bone is in like manner made up of the parts of two 
still less developed ischia, while no traces of the pubes have 
appeared. 
No dissections of the muscular or nervous systems were made, 
but we can infer from the osteology that there were two com- 
plete spinal cords. The innervation of each of the two functional 
hind legs must have been from the spinal cord of its own side. 
This separateness of the cord would have seriously affected 
coordination. It is related that in the two-headed turtle loco- 
motion was very imperfect (Barbour, '96), and in Ritta-Christina 
(Hektoen and Riesman, '01) a pinch on the right leg was felt 
only by Ritta and one on the left only by Christina. The indica- 
tions from a study of the bones are that the musculature of the 
outer legs was complete, while the muscles and nerves of the 
inner side must have been partly, though very incompletely, 
developed. 
The viscera of the thorax were not examined. This is to be 
regretted, because it would have been important to determine 
whether the two hearts and vascular systems were counterparts. 
It seems likely from the anatomy of the animal, so far as known, 
that they were; still, I am unable to assert the fact. There 
were two complete diaphragms, and the abdominal cavity was 

Fic. 5. — Junction of md small intestines of the two anterior bodies, and origin of 
the single posterior small intestine. 
completely subdivided anteriorly. The two livers were entirely 
distinct, as were also the two stomachs and the upper parts of 
the intestines. The small intestines run toward each other and 
meet, forming a continuous tube, as is shown in Fig. 5. There 
is no indication of a union of two parts at this junction. The 
vascular supplies of each part are totally distinct, the vessels of 
