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Show 946 MR. J. S. GARDINER ON CORALS [Dec. 14, of short subequal, much branched stems, not more than 6 mms. apart, 7-15 mms. thick, rather compressed and lobed at the apices. The branches are covered over their summits with extremely obtuse and rounded verrucae, many 5-6 mms. high and 4-5 mms. in diameter at their base ; the verrucae on the sides of the branches are scanty and somewhat appressed. The calices are everywhere from *8-l m m . in diameter and fairly round; they are generally surrounded by a distinct ring of somewhat flattened spines. The primary and secondary septa in many calices are distinct, rather thin, spiniform lamellae ; they are prolonged inwards and seem to fuse below with the columella, which is generally a distinct, low, broad, granular projection. The ccenenchyma is exceedingly well developed, even between the calices of the verrucae, in which position it is marked by a distinct groove between the cells. The corallum is very dense, the stereoplasm completely filling up the cells below. Sandal Bay, Lifu, Loyalty Islands. The specimen is a clump 8 cms. in diameter by 4 cms. high ; with it is growing a colony of Mudrepora violacea, the increase of which has killed a part of its clump. The nearest ally to this species seems to be P. clavaria, but its characters are such as to separate it very distinctly from all previously described species. 12. POCILLOPORA FAVOSA (Ehrenberg). (Plate LVI. fig. 3.) Pocillopora favosa, Ehrenberg, Die Corallenthiere des Bothen Meeres, p. 127. I have referred to this species after considerable hesitation several specimens, which agree fairly well with Ehrenberg's short description. The corallum forms clumps of much divided branches, which are generally more or less round, but may be slightly compressed and lobed towards their apices ; diameter of the branch 10 cms. below the apex about 1*5 cms., 5 cms. below the apex about 1*1 cms. Apices of the branches usually about 1*1 cms. in breadth by *7 cm. in width, completely covered with verrucae, which here and immediately below are from 2-3 mms. high by 1-2 mms. broad, and contain from 6-9 calices. The verrucae lower down on the branches get progressively lower, broader, and more obtuse, until on the main stems they form low projections about 1 m m . high by 4 mms. broad. The cells on the verrucas near the ends of the branches are round or oval in shape, *9-l*l mms. in diameter; but between the verrucae they are rather smaller, angular, very thin-walled and deep. The ccenenchyma is progressively more developed from the top to the bottom of the stems, and is covered by rough, compressed spines, which between the calices may form striations. The primary and secondary septa are well developed, especially iu the calices of the verrucae, but do not project far inwards ; the primaries are especially thick and bluntly spined, the tertiaries are here and there visible. Columella low and bluntly spined, usually distinctly joined, deep |