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Show 484 MR. E. T. B R O W N E O N [Mar. 17, corresponds with the characteristic features of the genus Laodice in possessing filiform and club-shaped cirri between the tentacles, and in the absence of marginal vesicles. The other species of the genus Laodice (L. mediterranea, Gegenbaur, L. calcarata, Agassiz, and L. ulothrix, Haeckel) appear to differ so slightly from one another, that I a m inclined to regard them as one species. The species which have been vaguely described by the early naturalists had better remain provisionally under the name of Laodice cruciata (Forskal). I think for the present, until more is known about the genus, that Thaumantias mediterranea had better be regarded as a distinct species-Laodice mediterranea (Gegenbaur),- and Cosmetira punctata as a synonym of it. I do not intend publishing a description of the Valencia Laodice until I have collected more specimens, which may then throw some light upon the other species. Fam. EUCOPIDJE. EUCHILOTA PILOSELLA (Forbes). (Plate XVI. figs. 7 & 7a.) Thaumantias pilosella, Forbes (1848); Gosse (1853). Laodice pilosella, Agassiz (1862). Laodice stauroglgpha, Agassiz (1862). Laodice cruciata, Garstang (1894). Forbes has given a fairly complete description of this species, omitting only the marginal vesicles. These important organs were apparently not considered by Forbes of any importance in the specific description of a medusa. Gosse found this medusa very abundant at Hfracombe, and described it again under the name Thaumantias pilosella, with eight marginal vesicles. At Valencia, during April and May, I found four specimens of a medusa which is identical with the Thaumantias pibsella of Forbes and Gosse. Forbes in his description of the species states :-" The umbrella, which sometimes measures nearly two inches in diameter, but more usually one, or one and a quarter, is hemispheric, and shaped like a watch-glass, but much more convex. It is transparent and smooth, except on the sides towards the margin, where it is as if woolly, being invested with minute epidermic hairs composed of fibrous cells. These, though sufficiently conspicuous, may escape the observer who is not aware of their presence, in consequence of their transparency. " The margin is fringed by very numerous (100) extensile (but usually borne rather short), pale pinkish tentacula, with bulbous bases. The bulbs are ocellated, with dense crescentic masses of purple pigment-cells. W h e n the margin is much magnified, it is seen to be bordered by a narrow band or thread of fibrous cells, from which the tentacles spring, and between each pair there are six or seven short, fine, secondary tentacles, without ocelli at their bases ... The sub-umbrella is depressed, and on its surface run the |