Hersiliodes canuensis Bourne (1890: 379, pi. 25 fig. 1-6). This species is based on a juvenile, probably female specimen, the oral parts of which have been figured; the legs have remained undescribed. Canu (1892: 254, note) has identified this species with Hersiliodes thompsoni Canu, 1888 ( = Hemicyclops thomsoni (Canu), vide infra). In our opinion the general shape of the body and the conspicuous difference in length of the furca strongly point against such a suggestion. It seems much more likely that H. canuensis either represents the developmental stage of an undescribed species of Hemicyclops, or a stage of H. purpureus Boeck. The only point which, in our opinion, weakens the latter supposition is the structure of the antenna in H. canuensis, which seems to possess a well shaped process on the third segment, carrying a strong spine as a continuation of a row of spinules of gradually increasing size along the internal margin of that segment. Un ­ fortunately Bourne's description gives no measurements of his two specimens.