. 
= f 
' 
46 ob C. Stokes—Fresh-water Infusoria., 
k. Normally its contour closely resembles 
that of Tracheophyllum apiculatum (Perty), C. & L. If, from 
the latter, the acutely conical anterior apex be removed, and 
thé flagellum of Jleonema be added, the result would be a: 
. . 
contracted forms being also striking. 
e fine long cilia are not abundant. They vibrate irregu- 
larly and, to a certain extent, independently of each other. 
species of the genus now under notice, the likeness between the 
enlargement, and even this the animalcule often loses, appar- 
ently without injurious results. This bulb seems to be sticky ; 
it at least easily attaches itself to foreign bodies, and I have 
witnessed its owner, after several attempts, forcibly tear itself 
oose and lose the bulb. The whole flagellum is generally 
carried trailing and curved to one side, occasionally being ex- 
portion of the non-flexible, non-vibratile-flagellum, and to more 
densely clothe the cuticular surface with shorter, more uni- 
formly moving cilia, in order to produce a typical member of 
the Cilio-Flagellata.. When the flagellum has been lost, the 
infusorian possesses no character to distinguish it from the 
