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 tubceformis. 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 

 and unequal pits resembling dimples. 



