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Show 558 DR. J. S. BOWERBANK ON [Nov. 2, red, nearly the same as in Bupicola crocea; but I may remark that C. victor gets this splendid garb immediately after its first green dress, without going into an intermediate yellow dress, such as that of C. luteovirens. One of the specimens of C. victor which I have had the pleasureofexaminingshowed the change of plumage very clearly, having on the sides of the belly and flanks still some grass-green feathers, the remnants of the first plumage. Another point of importance is also the range of both species. C. luteovirens has been found only on the islands of Viti-Levu and Ovalau, whereas C. victor, so far as our knowledge extends, is confined to the small islands of Taviuni and Lanthala, on the east coast of the large island Vanua-Levu. I believe the above-given remarks and comparisons between C. luteovirens and C. victor are sufficient to prove that they form excellent species, which ought not to be confounded in any way ; at least Mr. Layard must give us far more exact and minute explanation in order to prove that his conclusions are right. 10. A Monograph of the Siliceo-fibrous Sponges. By J. S. BOWERBANK, LL.D., F.R.S., F.Z.S., &c-Part V. [Received September 17, 1875.] (Plates LXI. & LXII.) FARREA SPINIFERA. (Plate LXI. fig. 1.) Sponge-form unknown. Dermal membrane unknown. External skeleton-surface (?) irregular ; primary fibres branching and anastomosing, large and strong, armed irregularly with very large and strong, acutely conical spines ; fibres and large spines mostly smooth, occasionally incipiently and minutely spinous; secondary fibres minutely spinous. Internal surface similar in character to the external one, but less strongly developed. Interstitial stratum-rete irregular, fibres more slender than those of the external surfaces, profusely minutely spinous, spines symmetrically disposed in about equidistant linear series in accordance with the long axis of the fibre. Sarcode dark amber brown. Colour, in the dried state, dark amber. Hab. West Indies, Captain Hunter, R.N. 1 Examined in the dried state. The specimen from which this species is characterized is a fragment seven lines in length, by four in greatest breadth; and it has every appearance of having been part of the side of a small cup-shaped Sponge. I have presumed that the surface having the stoutest fibres and the greatest amount of defensive armature is the external one. There are no indications of a symmetrical dermal rete, such as we find in some other species of Farrea ; but th« skeleton-fibres are quite in accordance with the structural peculiarities of of those of many species of that genus, and I have therefore referred |