G. 8P0NGIA. 169 



SHEATHY. 



82. Spongia vaginalis. From six to nine bun- 

 dled and coalesccnt tubes, slightly incrusted, hard 

 and brittle ; surface osculated, and stuck with com- 

 pressed tubercles which terminate in a point. 



American seas. 



FINGERED. 



83. Spongia digitalis. One or two short, united, 

 and flattish tubes, which are rough, stiff, and rather 

 prickly from the numerous little asperities on the 

 surface. 



Var. B. With long tubes. 

 Indian and American seas. 



STUDDED. 



84. Spongia bullata. Tubes knotty, more or less 

 coalescent, and incrusted ; composed of semi-trans- 

 parent blisters, of a very fine and fibrous texture ; the 

 terminal opening gathered in. 



Var. B. Tubes very short, numerous, and diffuse. 

 The first is found in Australasia, the second in the 

 Indian Ocean. 



SIPHON. 



85. Spongia sj/p^owoiJes. Tubes upright, drawn out 

 in form of a siphon, flabby, semi-transparent, bifur- 

 cated or trifurcated, insensibly contracting towards 

 their base. 



Var. B. Scarcely any incrustation. 



Isles of St. Peter and St. Francis, in Australasia. 



distaff. 



86. Spongia colus. Pediculatcd, upright, and in 

 Cor, Y 



