100 
CLASS I.— ORDER III. 
rows of tentacula ; the inner ones rising in a little 
plume, the outer spreading in the form of rays. 
The Tubularia vary little in their form ; they are 
simple or slightly branched : their substance is more 
or less thick according to the size of the Polypidom, 
always horny, membranous, and slightly transparent. 
Their colour is a shade of yellow fawn, clear or 
deep, dull or reddish • their height varies much, but 
never exceeds three decimetres. 
It is very rare that the Tubularia are parasites on 
marine plants: they usually attach themselves to 
rocks, shells, or other hard bodies ; sometimes, ad- 
hering to the keel of a vessel, they are transported from 
the Asiatic seas to those of Europe without losing 
any of their characteristics ; but the climate and tempe- 
rature soon affect these delicate beings, and they lan- 
guish and die, leaving nothing but their habitations to 
attest their existence in countries so distant from 
that which produced them. 
ANNULAR. 
1. Tubularia annulata . Tubes simple, of the 
thickness of a crow-quill, marked with projecting 
and approximate rings.— Plate 7. fig. 4. 
Catalonia. 
CORNUCOPIA. 
2. Tubularia cornucopia. A simple tube, smallest 
below, tortuous, and rough on the surface.— Plate 7. 
fig. 5. 
Mediterranean. 
UNITED. 
3. Tubularia indivisa . Tubes very simple. 
