176 CLASS III.— ORDER I. 



LEAFY. 



114. Sf oi>i Gi A f roTidif era. Somewhat branching, di- 

 vided in unequal lobes, which are proliferous ; the last 

 of the lobes being the largest, less irregular, more fo- 

 liaceous, incrusted, compressed, and as if bearded or 

 fringed on the upper border ; oscules scattered, and 

 nearly star-formed. 



Var. B. Less shapely, with a more compact crust. 



FRINGED. 



115. Sfoi>igia Jimbriata. Lobes leaf-formed, pedi- 

 culated, broad, a little incrusted, covered with unequal 

 pores like punctures ; borders garnished with crisped 

 or curled fibres. 



SECTION VL 



Masses branching, plant or tree-formed ; ramifications 



distinct, 



ARBORESCENT. 



116. Spongia arborescens. Stem firm and almost 

 cylindrical ; branches standing out, a little compressed, 

 but widening, palmated or digitated at the summit ; 

 oscules scattered, and sometimes pretty regular. 



Var. B. Lobes longer and upright. 



Var. C. Lobes long, compressed, narrow, straight, 

 and approximate ; borders osculated. 



American seas. 



