_Poseidon_, on the Corinthian and Attic B.F. vases—on which he is but a rare figure—is often hardly to be distinguished from Zeus, the approximation of the types extending even to their emblems. Where he holds in addition a dolphin or tunny-fish, there is, of course, no doubt as to his presence; nor, again, in the Gigantomachia, where he wields a rock (see p. 13, and Fig. 112); but his trident, which subsequently becomes the unmistakable evidence of his identity, often assumes (as on the Corinthian pinakes) the form of a sceptre ending in a lotos-bud,[1945] which is typical of Zeus, and, indeed, of Olympian deities generally. The other sea-deities are, however, of a more clearly defined type. The essential feature of _Triton_ is the fish-tail in which his body terminates. _Nereus_, on the other hand, is represented as an old man, bald and grey-bearded. In this form he contends with Herakles (see p. 101), and it may be that the differentiation was necessary to avoid confusion with the Triton type. As attributes he often holds a dolphin or tunny-fish, and a trident or sceptre. The winged deity with a long sinuous fish-tail seen on early Corinthian vases is probably _Palaemon_ (see p. 26); but in one case this deity is feminine.[1946] _Amphitrite_, as the feminine consort of Poseidon, holds a sceptre or tunny-fish, and _Thetis_ and the _Nereids_ appear in ordinary female form. The former, however, in her struggles with Peleus, is accompanied by lions, serpents, and other animals, which indicate the transformations she was supposed to assume. _Skylla_ appears as described in Homer, with fish-tail and the fore-parts of dogs issuing from her waist, which is encircled by a fringe of scales or feathers. _Demeter_ and _Persephone_ are not always distinguishable from one another, both having the same attributes—a torch or ears of corn (cf. Plate LI.). Their identification depends rather on the nature of their respective actions in the scenes where they appear. _Triptolemos_ is always seen in his winged two-wheeled car (sometimes drawn by serpents), and usually holds ears of corn or a libation-bowl; on B.F. vases he is bearded. The other Eleusinian deities, on the late R.F. vases where they occur, are marked by the large torches which they hold.