LECTURE XII. 205 



inches tall; 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 smull, 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 



