Together with the specimens of C. sciatherica, Leigh-Sharpe, presented to me by Michael G. L. Perkins, and taken by him from various Gadus morrhua at Lowestoft, in August, 1918 (vide Parasitology, XI, 118, and footnote), was another tube containing about a dozen further specimens taken by him at the same date, from the identical hosts. He first called my attention to the fact that we had two distinct species of Clavella from the same fish, and to him I am primarily indebted for most of the following observations. The claims of the other specimens to be considered as members of a distinct and new species are:—

(1) Body less globose, longer than wide.

(2) Ovisacs tapering.