G. SPONGIA. 
171 
CROWNED. 
91. Spongia coronata. Tubulous, simple, and very 
small ; crowned with a radiation of thorns. 
Coasts of France and England. 
TUBULAR. 
92. Spongia tubularia. Sessile, semi-oval, com- 
pressed, stiff, and pierced with longitudinal tubes ; 
external border convex. 
Seas of America. 
CILIATED. 
93. Spongia ciliata. Simple, tubulous, conical, 
tortuous, thin and ciliated at the extremity. 
Coast of Greenland. 
SECTION V. 
Masses foliated , or divided into flat lobes in the shape of 
leaves. 
FOLIATED. 
94. Spongia perfoliata. Stem simple, upright, 
hollow, and leaved ; lobes round, foliaceous, re- 
sembling the leaves of a Crassula, incrusted, and 
placed spirally round the stem. 
Australasian seas. 
N. B. This species is the most extraordinary and 
remarkable of any known Spongia. 
