G. SPONGIA. 
I 85 
HOOT-SHAPED. 
156. Spongia radiciformis. Branching, shapeless, 
and stiff ; branches tortuous, dichotomous, and com- 
pressed at the summits. 
PROLIFEROUS. 
157. Spongia prolifera. Repeatedly branched and 
palmated, the digitations distinct ; internally reticu- 
lated ; the external surface set with small thorns,, 
North America. 
OSSIFORM. 
158. Spongia ossiformis. White, and almost branch- 
ing; extremity swelled and osculated. 
Sea of Norway. 
MEMBRANOUS. 
150. Spongia membranosa. Somewhat branched; 
osculated, externally wrinkled or garnished with soft 
triangular spines. 
Indian Ocean. 
YELLOW. 
160. Spongia falva . Branching; branches long, 
cylindrical, about the thickness of a quill or a finger; 
fibres stiff, fragile, and almost longitudinal. 
American seas. 
FLOWERING. 
161. Spongia ftoribunda* Shapeless; bundles of 
branches, covered with a chaffy down, and thickest at 
their extremities. 
Indian Ocean. 
Cor. 2 A 
