In the above-mentioned note, published six months ago, several new species of Nemerteans were described and at the same time an attempt was made to a classification of the group, which should he in accordance with the results arrived at through the comparative study of a more extensive number of species and genera than had been at the disposal of any of my predecessors.; I am indebted for this plentiful supply of working-material to the constant support of Prof. Ant. Dohrn and his assistants, and I feel especially obliged for their kindness in forwarding to me — either alive or in excellent state of preservation — further specimens for comparison or determination ever since my departure from Naples.
