Dr. W. Marshall on new Siliceous Sponges. 391 yellow spots, much larger than those on the upper surface ; pectus yellowish, venter white. Expanse of wings 57 millim. Viti Islands. Allied to B. teutonia, but readily distinguishable by the absence of orange colouring from the under surface. 4. Ismene bilunata, sp. n. Wings above dark fuliginous brown, growing considerably paler towards the base, where there are afe~w greenish opaline hairs : primaries with two semitransparent white crescents placed, obliquely before the middle of the median interspaces ; fringe of all the wings tipped with white : body above greyish brown, the head and prothorax shot with opaline green ; palpi sordid white, with a black external lateral line and. black ter-minal joint. Wings below mouse-brown, primaries with the median area blackish, especially towards the base ; crescentic markings as above, apical area greyish, bounded internally by a transverse elbowed lilacine whitish streak : secondaries crossed beyond the middle by a rather narrow and nearly straight white stripe, which is interrupted towards its poste-rior extremity by a large black quadrate anal patch ; a slender white stripe at the base of the fringe, beginning at the black patch and running a short distance upwards towards the apex, but gradually fading away long before it reaches it : abdo-minal area faintly glossed with pink and green tints ; pectus greyish ; the femora white above, grey at the sides ; tibiaj and tarsi grey above and more or less ochreous below ; venter creamy white, barred with pale grey. Expanse of wings 52 millim. Viti, "Koro" (?Gk>ro). Allied to /. alexis <j> of S. India and Ceylon, but differing in the smaller crescents on the primaries, the much less lila-cine tint of the under surface, and the much more denned white stripe across the secondaries. XLVII. — On some new Siliceous Sponges collected by M. Pechuel-Losche in the Congo. By Dr. William Makshall*. [Plate XV.] Exceptional forms of animals and plants deviating in some respect or other from the general rule have ever excited * Translated from a separate copy of the Memoir sent by the author to H. J. Carter, F.R.S. The original appeared in the ' Zeitsehrift fur Natur-wissenschaften,' Neue Folge, Band ix. pp. 553-577.
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