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Show 58 MR. J. Y. JOHNSON ON T H E [Jan. 17, the south, it has never yet been discovered at Madeira. But it is not impossible that the dredges of the Prince of Monaco may alight upon its lurking-place when his well-equipped exploring yacht comes to work over this part of the bed of the Atlantic. 1. PLEUROCORALLIUM TRICOLOR, sp. nov. (Plate VII. fig. 3.) Branching subalternately in one plane to the fourth degree of subdivision ; branches flexuose, not coalescing, elliptical in section, attenuating upwards, the ultimate branches slender and ending in points. Axis hard, white, its surface smooth. Cortex pale yellow, granulated. Polype-cells pale vermilion-red, very prominent, subpedicellate, ovoid or subcorneal, 2-5-3 millim. long, less than 2 millim. in diameter. The upper part is divided into eight upright lobes standing round the orifice in a close circle. The cells are numerous and are irregularly scattered on the anterior face of the branches ; the ultimate branchlets have usually two, sometimes three cells at their tips. (The cells are shown about 2£ times the natural size in the accompanying figure to the left.) |