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Show 1881.] THE SURVEY OF H.M.S. 'ALERT.' 53 Hab. Elizabeth Island, 6 fathoms, on Fucus, in company with Schizoporella hyalina. Two colonies. Obs. Were it not for the fact that only one specimen of the original species has occurred on which to base its characters, it would have seemed advisable to make a new species of this, in consideration of its being spined. SMITTIA TRISPINOSA, Johnston, var. nov. LIGULATA. (Plate VI. fig. 9.) Discopora trisjrinosa, Johnston, Edin. Phil. Journ. xiii. p. 222. Lepralia trispinosa, Busk, Cat. Brit. Mus. Polyzoa, ii. p. 70, Smittia trispinosa, Hincks, Hist. Brit. Mar. Polyzoa, p. 353, pi. xlix. figs. 1-8. A yellowish patch embracing the base of a colony of a branching Cellepora. The cells are markedly diamond-shaped ; the surface is much perforated, a marginal series of larger perforations being-distinguishable from the rest; a raised line is irregularly present around the cells. The lower side of the mouth is much raised, each of the inferior angles being occupied by a smooth swelling, often of different sizes on the two sides ; sinus small. A very peculiar, long, narrow, strap-shaped avicularium extends from close to one or both sides of the mouth downwards to a distance of about half the total length of the cell; the mandible points downwards ; a few elongated or oval small avicularia sometimes present on the sides or behind the mouth. Surface hyaline. Ovicell globular, but flattened, upper edge bearing a semicircle of large punctures. Spines absent or broken off. Hab. Victoria Bank, off S.E. Brazil, 33 fathoms, on Cellepora. Obs. The long avicularium described evidently represents the large triangular form described by Hincks {I. c.) as sometimes present; for it is sometimes replaced by such a one of almost the normal characters. A similarly placed but generally broader form occurs in a specimen described as Lepralia reticulata, var. incequalis, by Mr. A. W . Waters, from Naples. RETEPORA CELLULOSA, Oken ? Frondipora cellulosa, Oken? " Lehrbuch Nat. 63." Retepora cellulosa, Lamarck, Hist. Anim. s. Vert. ed. 2, ii. p. 276. A small and worn fragment without ocecia perhaps represents this species; but spines and long rostrum are alike absent. Most cells, however, could not have had a long rostrum, but are iu the condition represented by plate cxxiii. fig. 7 of the Brit.-Mus. Catalogue of Polyzoa, vol. ii., with the addition of avicularia. Hab. Borja Bay (north-western part of Straits of Magellan), 20 fathoms. RETEPORA ALTISULCATA, sp. n. (Plate VI. fig. 5.) Frond flatfish, slightly undulated; fenestrse elongate-oval, generally about equal in diameter to the reticulations, which are almost cylindrical. Zocecia crowded, oblong. Surface marked with |