168 
CLASS III.— ORDER I. 
COMPRESSED. 
76. Spongia compressa. Simple, conical, and com- 
pressed ; internally cloven lengthways. 
Greenland seas. 
RUGGED. 
77. Spongia lacunosa. Simple, cylindrical, tubu- 
lous, and very thick ; deep clefts on the outside, si- 
nuous and irregular. 
TUBULAR. 
78. Spongia tub&formis. Tubes long, coarse, and 
simple, united at their base ; tubercular on the ex- 
ternal surface, as if granulated. 
American seas. 
candle of the sea. 
79. Spongia fistularis . Tubes long and narrow; 
fibres bare, stiff, reticulated, loosely and visibly inter- 
woven. 
American seas. 
PLIABLE. 
80. Spongia plicifera. Tube inclining to funnel- 
shape, flexible, very much wrinkled; fibres slightly 
incrusted; on the outside are numerous folds and jags ; 
in the inside dispersed cells resembling a honeycomb. 
American seas. 
FURROWED. 
81. Spongia scrobiculata. Funnel-shaped and 
flexible ; the two surfaces covered with little round 
und unequal pits resembling dimples. 
