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Show 1881.] THE SURVEY OF H.M.S. 'ALERT.' 101 1876, p. 453), from Tuesday Bay, Straits of Magellan. The difference between the size of the largest specimen now under examination and the object of Philippi's description is considerable; the latter measured 4\ lines long and 3 lines broad, whereas that from Dr. Coppinger is 43 millims. long and 25"25 millims. broad. Studer's specimens afford an intermediate size, for they were 40 millims. long and 20 millims. broad. The other specimens give the following measurements-5'5 millims. and 4*25 millims., and 4"5 and 3*25, respectively, for their length and breadth. (1) 2 small specimens, Portland Bay, 10 fms. (2) 1 specimen, Latitude Cove. CHIRODOTA PURPUREA, Lesson, Cent. Zool. p. 155; Studer, Sitzungsb. Akad. Berl. 1876, p. 454. I refer to this species four small specimens which were collected off Elizabeth Island in six fathoms of water. For the present I must abstain from offering any opinion on the validity of the new genus Sigmodota, which Herr Studer proposes for the reception of this species. X. CCELENTERATA. By STUART O. RIDLEY. (Plate VI.) ACTINOZOA. ZOANTHARIA. PARACTIS ALBA, Studer?. Paractis alba, Studer, M.B. Ak. Berlin, 1878, p. 545, pi. v. fig. 19. Two specimens in spirit, without any distinct coloration, except a faint cream-colour on the disk and tentacles. The tentacles are present, in the least contracted of the two specimens, in numerous cycles, short, thick, the central ones tipped by a slight distinct point; they decrease in size towards the margin of the disk. The base appears to have been broader than the disk in life; and the height of the body is about equal to the breadth of the base. The sides of the body are smooth, with the exception of some more or less distinct ridges which mark the position of the mesenteries. Height of largest specimen 22 millims., extreme breadth of disk 19, base 22 Hab'. Trinidad Channel, S.W. Chili, 60 fathoms. The identity of this species is doubtful. The tentacles occur in only two cycles in Studer's specimen ; in the longitudinal striation of the body, however, it resembles this form. PARACTIS sp. inc. One spirit specimen, coloured as the preceding species. The disk is much everted, and touches the base ; nearly half of its surface is bare, the margin being occupied by two cycles of thick tentacles |
