OF THE SPONGIAD^E. 259 



PIG. 



191. SPINULO-QUADRIFURCATE HEXRADIATE STELLATE. 



X 1060. A rectangulated hexradiate spiculum, 

 having each primary ray terminating in four nearly 

 equidistant cylindro-spinulate secondary radii. 



These spicula occur abundantly in a beautiful and 

 unique specimen of a cup-shaped siliceo-fibrous 

 sponge formerly in the cabinet of my friend Mr. 

 Thomas Ingall, now in the British Museum. The 

 remains of the sarcode are crowded with them in a 

 perfect state of preservation. The specimen repre- 

 sented by Fig. 2 has had three of its primary radii 

 broken off near their common base, thus enabling us 

 to see distinctly the structure of this curious and 

 beautiful form of spiculum. Page 55. 



192. SPINULO - MULTIFURCATE HEXRADIATE STELLATE. 



X 660 linear. This spiculum forms a connecting 

 link between the spinulo-quadrifurcate hexradiate 

 stellate form and the floricomo-stellate one. A 

 careful examination of the specimen presents indi- 

 cations of there having been as many as eight 

 secondary radii at the termination of the primary 

 ray which exhibits the greatest number of secondary 

 ones in the figure, and it is probable that this was 

 the full complement of those parts. Sponge un- 

 known. Page 55. 



193. FLORICOMO - HEXRADIATE. From Euplectella asper- 



ff ilium ^ Owen, in the cabinet of Mr. Hugh Cuming, 

 showing four out of the six primary radii, and the 

 mode of the attachment of the secondary ones to 

 their distal terminations. X 660 linear. Page 55. 



194. FLORICOMO-HEXRADIATE. From the same sponge as 



Fig. 193, exhibiting a front view of the congre- 

 gated expanded apices of one of the groups of the 

 secondary radii, and the contour of a perfect spicu- 

 lum. X 660 linear. Page 55. 



