272 ANATOMY AND PHYSIOLOGY 



FIG. 



256. FIBRO-MEMBRANOUS TISSUE. From the dermal mem- 



brane of a Stematumenia. X 183 linear. Pages 

 100, 211. 



257. FIBRO-MEMBRANOUS TISSUE. In which the layers of 



fibre cross each other at about ridit angles. From 

 Alcyoncellum robusta, Bowerbank. X 660 linear. 

 Page 100. 



25S. FIBRO-MEMBRANOUS TISSUE. In which the layers of 

 fibre cross each other at various acute angles. 

 From Alcyoncellum robusta, Bowerbank. X 308 

 linear. Page 100. 



FIBROUS STRUCTURES. 



PRIMITIVE FIBROUS TISSUE. 



259. PRIMITIVE FIBROUS STRUCTURES. Dispersed on the 



inner surface of a portion of the dermal membrane 

 of a young Stematumenia; a a, cells in situ, 

 which have each produced a fibre. X 660 linear. 

 Page 70. 



260. DETACHED SPECIMENS OF PRIMITIVE FIBROUS TISSUE. 



In progressive stages of development. X 660 

 linear. Page 70. 



KERATOSE FIBROUS TISSUE. 



26 1 . SOLID KERATOSE FIBRE. From a cup-shaped specimen 



of the best Turkey sponge of commerce, in the 

 condition in which it came from the sea. X 175 

 linear. Page 73. 



262. SPICULATED KERATOSE FIBRE. From Chalina oculata, 



Bowerbank. X 175 linear. Pages 74, 208. 



