G. SPONGIA. 
177 
ROD-SHAPED. 
117. Spongia virgultosa. Stem hard, upright, and 
unequally cylindrical ; branches stretching out in the 
form of rods, upright, spriggy, unequal, and termina- 
ting in obtuse points; surface velvety and osculated. 
Var. B. Branches flexuous and diverging. 
Seas of the north of Europe. 
LONG-POINTED. 
118. Spongia longicuspis. Base forming a coarse 
trellis, supporting from six to nine long upright 
branches, which are sometimes coalescent, forming 
slender digitations, or long points. 
Southern seas. 
ASPARAGUS. 
119. Spongia asparagus. Upright and branching ; 
branches in the form of rods, unequally cylindrical, 
and rather obtuse at the summits ; incrustation not 
thick ; oscules almost disposed in series. 
Seas of Australasia. 
DICHOTOMOUS. 
120. Spongia dichotoma. Upright; branches cy- 
lindrical, hairy, and lateral. 
Var. B. Branches tortuous, frequently anasto- 
mosed. 
Sea of Norway, and Mediterranean. 
BRISTLED. 
121. Spongia echidncea. Corky and branching ; 
Cor. 
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