Ceina Della Valle.

Ceina Della Valle, 1893, p. 530; Stebbing, 1899, p. 397, and 1906, p. 554.

The genus may perhaps be defined as follows: Mandible without definite molar tubercle. First maxilla with palp absent or vestigial, inner lobe small and without plumose setae. First gnathopoda small and subchelate in both sexes; second gnathopoda large and chelate in the male, subchelate in the female. Third uropoda represented by a small rounded lobe. Telson formed of a thick plate, partially cleft.

It is not easy to assign a definite position to this genus among the allied genera of the family. In many of the characters it more or less resembles Hyale, but it distinctly differs from this genus in the mandibles, first maxillae, the vestigial third uropoda, and the telson. In the last points it shows some approach to the genus Chiltonia, but the special character of the mandibles and of the inner lobe of the first maxillae are different from anything known to me among other Talitridae; the vestigial nature