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Show 564 DR. J. E. G R A Y O N OCULINARIA. [Nov. 12, truncated and only slightly angularly bent in the middle, and animal has a distinct white streak on each side of its neck, and the shields over the temples are flatter. The ridge of large tubercles on the under outer side of the hind legs are small and more equal; and the nose is longer, more conical, and produced. The under and outer sides of the hind legs with a series of large broad scales, the last, near the feet, being high and conical. DESCRIPTION OF PLATE XLII. Fig. 1. Hydraspis gordoni (nat. size), from the animal living in the Zoological Society's Gardens. *2. Gular end of sternum (one-fourth of nat. size). 3. Anal end of sternum (one-fourth of nat. size). 5. Note on Oculinaria, a N e w Genus of social Ascidia. By Dr. J. E. G R A Y , F.R.S., V.P.Z.S., &c. The British Museum lately received from Dr. Bowerbank some animals in spirits from Fremantle, West Australia. Among others there is a group of Ascidia that is very distinct from any that I have previously seen. It is very like a fragment of an old stem of Oculina virginea. I therefore propose to call it OCULINARIA AUSTRALIS. B.M. The mass is cylindrical, about 8 inches long, and 1^- inch in diameter in spirits. It is white, with ends rather tapering and rounded. Oculinaria australis. It entirely consists of a large number of more or less oblong placed closely side by side on every side of an imaginary central axis, |