gl F. T7. PHILLIPS — A NEW FLAGELLATE ANmALCTJLE. 



During these movements one end of the chain is anchored to some 

 substance, the other floating freely with a worm-like motion ; 

 these movements take place at the rate of about three per minute. 

 The second movement is a chipper-like motion, each zooid closing 

 upon the other, like the two shells of a bivalve mollusk ; this 

 motion is much quicker than the former and is irregular, while 

 the former is rhythmical. 



Owing to the awkward position of those groups I saw, I have 

 never been able to make out clearly the nature of the supposed 

 elastic integument which unites the zooids, but from a careful 

 examination of the movements, I have but little doubt as to its 

 existence. 



The genus and species may be thus briefly described : — 



Genus Chlorodesmos (xXw/>o?, green ; ceajno^, chain). 



Animalcules free-swimming and adherent, united in chain-like, 

 social clusters, each zooid contained in a separate membranous 

 sheath or lorica ; flagella two in number, subequal ; endoplasm 

 containing two lateral pigment-bands. 



C. hispida. Loricae triangular, widest posteriorly, their external 

 surfaces beset with evenly-developed spinous processes ; contained 

 animalcules entirely filling the cavities of the loricse ; flagella 

 produced from within a pharyngeal cavity or cleft, at anterior 

 extremity ; one contractile vesicle. Chain-like colonies consisting 

 of as many as thirty zooids. 



Habitat. Pond water. 



DESCRIPTION OF PLATE I. 



Figs. 1-2. Symira Uvella (after Stein). 1. Small colony, showing manner of 



attachment. 2. Adult spheroidal colony-stock. 

 Figs. 3-4. Clilorodcsmos hhpula. 3. Colony attached and extended. 4. Colony 



free-swimming and contracted. 



