G. SPONGIA. 
169 
SHEATHY. 
82. Spongia vaginalis. From six to nine bun- 
dled and coalescent 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 syphonoides. 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 colas. Pediculated, upright, and in 
Cor. 
Y 
