302 Rev. T. Hincks on the disci of the species of Meyenia [Ephydatia]^ and in the same way that between the coating-spicules of the species of Spon-gilla. In both cases this tissue, consisting of air-chambers, acts as a hydrostatic apparatus, which has attained its most powerful development in the two European species — Sj). fragilis and Trochospongilla erinaceus.'" XXXIX. — The Polyzoa of the Adriatic: a Supplement to Prof. Heller^ s ''Die Bryozoen des adriatischen Meeres^ 1867. By' the Eev. Thomas Hincks, B.A., F.R.S. [Concluded from vol. xvii. p. 271.] [Plate IX.] SCHIZOPORELLA, Hincks {continued^. Schizoporella vulgaris^ Moll. f Lepralia Botterii, Heller, B170Z. d. adriat. Meeres, p. 30, pi. ii. fig. 4. P Lepralia Stossici, ibid. p. 31, pi. ii. fig. 7. I do not venture to refer Heller's two species noted above with certainty to the well-known S. vulgaris of Moll in the face of the figures which he has given of them ; but his descriptions apply for the most part to the latter form, and I think it more than probable that we have only to do with a single species. The neck-like prolongation of the upper part of the zooecium wliich is shown in the figure of L. Botterii is certainly not characteristic of S. vulgaris ; but there is no reference to it in the diagnosis ; the cells are described as *' oval, moderately convex, smooth." The present species seems to be common in the Adriatic and could hardly have escaped notice. Primary cell ovate, smooth, with an oval aperture occupying the upper part of the front, set round witli spines, of wliich the one in the centre of the lower margin is taller than the rest, slender, and bent inward over the opening. Range. Britain (chiefly south and west) ; Ireland (west coast) ; Naples \ Madeira. Schizoporella Cecilii, Audouin. ? Lein-alia Tenujiana, Heller, op. cit. p. 26, pi. ii. fig. 10. I should unhesitatingly identify Heller's L. Perugiana with
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