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Show 126 DR. J. E. GRAY ON CORALLIUM JOHNSONI. [Jan. 24, Hemicorallium johnsoni. CORALLIUM RUBRUM, Lam., M.-Edw. Corall. i. 204. Madrepora rubra, Linn. Lsis nobilis, Pallas. Hab. Mediterranean. 2. PLEUROCORALLIUM. B.M. " The coral branching in a plane. The polypes scarcely raised, confined to one surface, mostly near the apex of the very small branchlets, and often in twos." The branchlets in the figure are chiefly confined to one edge of the branches. PLEUROCORALLIUM SECUNDUM, Dana, Zoophytes, p. 641, t. 60. f. 1, 1 a. Hab. Sandwich Islands ? ? (Dana). 3. HEMICORALLIUM. The polypes prominent, ovate-cylindrical, often clustered, all distributed on one side of the branches. |