OF THE SPONGIAD.E. 273 



FIG. 



263. SPICULATED KERATOSE FIBRE. From Chalina Mon- 

 tagui, Bowerbank, a young fibre in course of 

 development (a) the apical spiculum. X 175 

 linear. Pages 74 and 108. 



264. MULTISPICULATED KERATOSE FIBRE. From Des- 



macidon (eyagropila, Bowerbank. X 108 linear. 

 Page 75. 



265. INEQUI-SPICULATED KERATOSE FIBRE. From Ea- 



phyrus Griffit/tm, Bowerbank. X 175 linear. Pages 

 75 and 201. 



266. SIMPLE FISTULOSE KERATOSE FIBRE. From Sjwnyia 



jistdaris, Lamarck. X 108 linear. Pages 76 and 

 209. 



267. COMPOUND FISTULOSE KERATOSE FIBRE. From the 



skeleton-fibres of Auliskia, Bowerbank, exhibiting 

 the secondary canals radiating from the primary 

 ones. X 300 linear. Pages 77 and 210. 



268. COMPOUND FISTULOSE KERATOSE FIBRES. From 



Auliakia, Bowerbank, exhibiting the general cha- 

 racter of the fibre. X 100 linear. Pages 77 and 

 210. 



269. REGULAR ARENATED KERATOSE FIBRE. From one of 



the Bahama sponges of commerce. X 175 linear. 

 Page 77. 



270. IRREGULAR ARENATED KERATOSE FIBRE. From Dy- 



sided fragilis, Johnston, having the siliceous grains 

 very abundantly packed in its substance. X 10 s 

 linear. Pages 78 and 211. 



271. IRREGULAR ARENATED KERATOSE FIBRE. From Dy- 



sldea fragilis, Johnston, exhibiting its general cha- 

 racter in situ. X 108 linear. Pages 78 and 211. 



"272. IRREGULAR ARENATED KERATOSE FIBRE,, showing how 

 the young fibre picks up the grain of sand and 

 surrounds it with keratode. X 108 linear. Pages 

 63, 78, and 211. 



273. HETRO-SPICULATED KERATOSE FIBRE. From Dip- 

 lodemiavesicula,Rowei'bank. X 175 linear. Pages 

 74 and 202. (See Plate XIV.) 



18 



