LECTURE XII. 
205 
inches tall j and from the top of each proceeds a 
crimson head, of the form before mentioned, and 
about three quarters of an inch in diameter. But 
the most beautiful are two species, by no means 
very uncommon in clear stagnant waters, where 
they adhere to various substances. The whole 
Zoophyte appears, at first view, like a small, trans- 
parent bladder, sometimes slightly, and sometimes 
very much branched, so as to extend to the dis- 
tance of about two inches : and from the top of 
each of the divisions of the vesicular part proceed 
five or six, or sometimes ten heads, of the most 
beautiful transparent white, and of about the 
eighth of an inch or more in diameter ; each head 
being surrounded by sixty arms or tentacula, dis- 
posed in the form of a crescent, and generally in a 
state of rapid circular motion. These beautiful 
Zoophytes may be kept for many months in 
glasses of water, and exhibit a most elegant spec- 
tacle, especially when slightly magnified. These 
two fresh-water species vary a little in form, and 
are often confounded with each other. The one is 
the Tubularia reptans, and the other the Tubula- 
ria campanulata : In English they may be term- 
ed the Creeping or branching, and the Bell-shaped 
