188 Mr. J. S. Dunkerly on the Choanoflagellate 



which had one flagellum, but no collar, was seen to move 

 slowly away and to settle down as at b. After ten minutes it 

 moved slowly away, with its flagellum trailing as a pulsellum 

 (d). At this stage x had moved up to near the mouth of its 

 lorica, the customary situation (c) ; apparently the animal 

 descends in its lorica for the purpose of division. The free 

 individual (y) was observed for an hour to be moving slowly 

 about with feeble movements of its flagellum. Extremely 

 fine pseudopodia were seen at times to be extruded from the 

 anagellate region of the body (d). These may serve as 

 attaching processes when the animal settles down, but the 

 particular individual was unfortunately lost at this stage. 



POLYCECA. • 



Polyceca dichotoma (text-fig. 2) was the name given to a 

 species of Clioanoflagellata found by Saville Kent in a marine 

 tank at the Crystal Palace in 1874. Since that time it has 

 not been recorded, neither France (4) nor Butschli (3) having 



Fig. 2. 



Polyceca dichotoma (after Saville Kent). 



seen it. France admits it as a genus in his monograph {loc. 

 cit.), but writes : — " Diese eigentumliche Art, . . . wurde in 

 den letzten 23 Jahren von Niemandem wiedergefunden." 



I found a form obviously answering to Kent's description 

 of this genus quite abundant in a tank at Plymouth Marine 

 Biological Station in August 1909, but have not succeeded in 

 finding it in material from outside. 



