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Show 532 PROF. F. j. B E L L O N H O L O T H U R O I D S . [June 23, Amphicyclus japonicus, but for the great length of the retractor muscles ; though these prolonged bands have a tendinous appearance, they are of the same histological structure as the more obviously muscular part. CUCUMARIA BICOLOR, sp. nov. (Plate XLV. fig. 2.) Body irregularly pentagonal, tapering slightly at its hinder end ; no anal teeth ; distinctly marked off into ambulacral regions which are quite white, and interambulacral regions which are chocolate or black ; the ambulacra very wide, the suckers arranged irregularly, but in more than two rows ; the bivial are narrower than the trivial ambulacra ; the suckers are strictly confined to the ambulacra. The state of contraction is such as to make a complete description of the internal anatomy impossible, but it may be noted that the integument is thick, the calcareous oesophageal ring fairly well developed, the interradial piece ending in a dagger-shaped process, and the radial being about twice as wide as the interradial; the genital tubes are numerous. The spicules are few in number and small in size ; the spine of the turriform bodies is bifurcated at its free end. Length 36 ; 25 millim.: greatest breadth 20; 12 millim. King Sound, W . Australia. This species seems to be most closely allied to C. versicolor, from which it differs in the absence of ambulacral papillae. CUCUMARIA INCONSPICUA, sp. nov. (Plate XLV. fig. 3.) Small, stout, a little rough to the touch, with the suckers not quite definitely limited to the ambulacra, though very often nearly so ; the trivial suckers are in four and the bivial in two fairly regular rows. No anal teeth. The pharyngeal ring large, the muscles stout and inserted at once into the body-wall; the ring appears to be made up of fine sets of equal pieces, formed probably by the equal radial and interradial calcifications ; the Polian vesicle is large. The genital tubes are long, simple, and not numerous. The spicules are rare, and are only in the form of large deposits of the shape shown in Plate X L V . fig. 3. Colour varying shades of dark slate or brown. Average length 17 millim., average greatest breadth 6 millim. Port Phillip Heads. Collected by J. B. Wilson, Esq. The irregularity of the arrangement of the suckers of this species appears to afford a strong argument against the division of the genus Cucumaria into Cucumaria s. str. and Semperia, which has been proposed by Lampert. HOLOTHURIA (FOHADSCHIA) WHITM_3_.I, sp. nov. (Plate XLV. fig. 4.) This is a large Holothuria with a stellate anus, and deposits not irregular rosettes, but stout basket-like knobbed bodies. The body is flattened (in spirit); no dorsal papillae or suckers ; the ventral surface is thickly packed with suckers. Mouth ventral |