338 Mr. K. E. Lewin. The Behaviour of the [Sept. 15, 



Figs. 1—7. 



The figures were drawn from animals fixed and stained with Schneider's acetocarmine 

 and mounted in glycerine. This method does not lend itself to the preservation of 

 cytoplasmatic detail, but in practically every case the adoral ruembranella? could be 

 distinguished, and are represented to mark the anterior end of the animal. The outlines 

 were sketched with the aid of a camera lucida, and the magnification was 300 (Zeiss 

 apochr., obj. 3 mm., oc. 4). 



