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(d) REFERENCES TO ADDENDUM. 
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Note (see p. 45). 
While revising the proofs of this memoir, my attention has been drawn to 
“A Note on the Morphology of Spirocheta duttoni,” by the late J. E. 
Dutton and J. L. Todd, published in the ‘Lancet’ for Nov. 30th, 1907, 
pp- 
1523-5. These authors find that S. duttoni “may. multiply by direct 
division longitudinally or transversely,’ and that.an undulating membrane 
is present (see my footnote on p. 34 of this memoir).—December 3rd, 1907. 
