op THE SPONGIAD^. 273 



Via. 



263. SpicuiiATED KEKATOSE FIBRE. Frooi Chdlina Mon- 



ta^u% Bowerbank, a young fibre in course of 

 development (a) the apical- spiculura. X 175 

 linear. Pa,ges 74 a,nd 108. 



264. MuLTispicuLATEU KERATOSE FIBRE. From Des- 



macidon agagropila, Bowerbaqk. X 108 linear. 

 Page 75. 



265. Inequi-spiculated keratose fibre. From Ra- 



phyms Griffithsii, Bowerbank. X 175 linear. Pages 

 75 and 201. 



266. Simple fistulose keratose fibre. From Spongia 



fistularis, 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. Pa^e^ 7,7 and 210. 



268. Compound I'tsTULosE keratose fibres. From 



AulisMa., Bp;w^i?bank,exhil^iting 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. Jrregular arenated keratose fibre. From By- 



mdeafragilis, Johnston, having the siliceous grains 

 very abundantly packed in its substance. X 108 

 linear. Pa,ges 78 and 211. 



271. Irregular arenated keratose fibre. From By- 



sidea 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-spioulated keratose fibre. From Bip- 



lodemia vesicula, Boweihaak. X 175 linear. Pages 

 74 and 202. (See Plate XIV.) 



18 



