152 CLASS III.— ORDER I. 



SECTION I. 



Masses sessile, simple or lobed, either covering or 



enveloping. 



COMMON. 



1. S PONG I A communis. Masses rather large, 

 spreading, and slightly convex upon the top, soft, 

 tough, and coarsely porous ; scooped out and jagged 

 particularly below, exhibiting round holes, mostly 

 very large. 



Red Sea, Indian Ocean, and perhaps in the Medi- 

 terranean. 



JAGGED. 



2. Spongia lacinulosa. Surface rather finely po- 

 rous, and stuck with numerous little jags or risings, 

 which are soft, and make it appear downy; lobed 

 above, or pierced with holes of a middling size, having 

 their borders ciliated with those little spongy jags, 

 called lacimdes, from whence it derives its name. 



Found in the Red Sea and Indian Ocean, and is 

 not unfrequently used as a substitute for the common 

 sponge (S. communis) for domestic purposes. 



SINUOUS. 



3. Spongia sinuosa. Oval and sessile; texture 

 fibrous, stiff, and partially incrustated ; surface covered 

 with numerous and deep holes, crevices, and sinuo- 

 sities. 



Indian Ocean. 



