100 CLASS I.— ORDER III. 



rows of tcntacula ; 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 corr«/cop?<^. A simple tube, smallest 

 below, tortuous, and rough on the surface.— Plate 7. 



fig- 5. 



Mediterranean. 



UNITED. 



3. Tubularia indivisa. Tubes very simple. 



