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Show 1897.] FROM THE S.W. PACIFIC OCEAN. 947 down in the calice, by one of the directive septa. Corallum usually heavy, the ccenenchyma between the cells and the stereo-plasm within being well developed and very dense in the older parts of the colony. Funafuti; 7 and 8 fathoms. The colour of the living colony is green. The corallum of the lower stems of the colony is much stained wdth a dark red-brown pigment on the exterior. The form described by Klunzinger as P. favosa seems to m e to belong to an entirely distinct species. I have described the species from three large fragments, apparently from the same colony, obtained from 7 fathoms. A clump 9 cms. in diameter by 8 cms. in height was obtained from 8 fathoms; it differs in having the septa rather thinner, the secondary less distinct. The base of the colony has round shallow calices about •9 m m . in diameter. 13. BOCILLOPORA ASPERA, Verrill. Pocillopora aspera, Verrill, Eroc. Essex Inst. vol. vi. 1868, p. 93. Two small specimens correspond closely to Verrill's description of this species. The largest is about 7 cms. long, and is part of a considerable clump. The older branches are strongly compressed and have the summits somewhat bare, while the younger branches have their apices conspicuously verrucose. Tbe verrucae vary from 2-5 mms. in length by 1-3 mms. in breadth at the base, and arise obliquely, but are little appressed to the branches. The calices of the verrucae are oval in shape, 1-1*3 mms. in long diameter; their primary and secondary septa are distinct, the directive septa more prominent and extending to a small, distinct, spinulous columella. The calices of the ends of the branches are angular in shape, about 1*1 mms. in diameter, with very thin walls, and are very deep; their septa and columella are not developed. In places at the sides of the branches the calices are very small, not more than *8 m m . in diameter, round in shape and shallow, with distinct septa and columella ; the ccenenchyma is well developed between these, and covered with low granular spiues. The corallites of the base of the colony resemble the latter, but the ccenenchyma is better developed, and there are a few larger, round calices 1*3 mms. in diameter. The corallum of the base of the colony is stained a dark brown-red colour. The living colony is dark green. Funafuti; 5 and 30 fathoms. Var. DAN^E (Verrill). Pocillopora dance, Verrill, Bull. Mus. Comp. Zool. p. 59 (1864). Pocillopora dance, Verrill, Eroc. Essex Inst. vol. vi. 1868, p. 93. Two specimens correspond very closely to Verrill's description, but there is a third, which seems absolutely intermediate between this " species " and P. aspera, so that 1 have constituted it a variety. The septa and columella can be traced in many of the |