538 DR. J. S| BOWERBANK ON [Nov. 2, 
red, nearly the same as in Rupicola erocea; 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. lu- 
teovirens. One of the specimens of C. victor which I have had the 
pleasure of examining showed 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. /uteovirens has been found only on the 
islands of Viti-Levu and Ovalau, whereas C. victor, so far as our know- 
ledge 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 aud 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. 8. 
BowerBank, LL.D., F.R:S., F.Z.8., &—Part V. 
[Received September 17, 1875. ] 
(Plates LXI. & LXII.) 
FarrEA SprIniFERA. (Plate LXI. fig. 1.) 
Sponge-form unknown. Dermal membrane unknown. External 
skeleton-surface (?) irregular ; primary fibres branching and anasto- 
mosing, 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 ex- 
ternal 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.? 
Examined in the dried state. 
The specimen from which this species is characterized is a frag- 
ment 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 the skeleton- 
fibres are quite in accordance with the structural peculiarities of 
of those of many species of that genus, and I have therefore referred 
