72 Mr. R. Kirkpntrick on the Spongodes JlahelNfera , n. sp. The colony forms .in upright stem, 73 milHm. high, from which, at a height of 30 millim. and u])wards, branches come off on all sides. Tliese speedily ramifying form at the end small umbels, in which each terminal twig bears a bundle of from three to eight polyps ; but here and there also single polyps occur. The lowermost branches are flat and their twigs are fused together ; they thus form fan-shaped serrated folia, the margins of which are beset with rows of polyps. The ramifi-cation is loose, so that it can easily be made out everywhere. The polyp-heads are pedunculate, free from one another for a short space, and slightly surmounted by bundles of spicules. The heads are surrounded by eight groups of spicules arranged en chevron y which project like teeth above the margin. millim. Height of tie sterile stem 30 Diameter 16 Height of the polyp-bearing portion 43 Diameter 35 The colour of the polyp-umbels is dark fleshy red, the stem and branches are white. Locality. Enoshima, Japan. Collected by Dr. Doederlein. Spongodes Klunzingeri, n, sp. Spongodes ramulosa, Klunzinger, Korallthiere des rothen Meeres^ p. 37, pi. iii. fig. 2. Non Spoygodes rmnuhsa, Gray, Proc. Zool. Soc. 1862, pp. 28 and 29, figs. 5 and 6. After a comparison of the tyiiical specimen of Spongodes rawnhsa, Klunzinger, which Professor von Martens most kindly lent me from the Berlin Museum, with specimens of Gray's species, it became evident that the two are speci-fically distinct. Hence the name S. Klunzingeri might be adopted for the species from the Red Sea described by Klunzinger. X. — Polyzoa of Mauritius. By R. KlEKPATRiCK, Assistant in the British Museum (Natural History). [Plates VH.-X.] I HAVE great pleasure in taking this opportunity of thanking-the Rev. Thomas Hincks, F.R.S.,for his kindness in reading my manuscript and offering many valuable suggestions.