FAUNA OF THE CHESS AND GADE. 



453 



were obtained seven specimens of D. tetractis. Their chief 

 features were easily seen, viz. a vase-shaped faceted lorica ; a 

 very movable head which seemed as if set in a cup and moved 

 to and fro, a movement rendered the more striking by the 

 corresponding movement of the brilliant red eye-spot; a very 

 long, jointed foot with two well-marked curved spurs, as shown 

 in figs. 14 and 15; and two long toes of nearly equal width 

 throughout. One specimen, from which figs. 14, 15 and 16 

 were drawn, was watched for a long time. It often remained 

 anchored, and its toes assumed all possible positions from A to 

 B, fig. 16, owing to the Eotifer moving slowly in the direction 

 of the length of its lorica, while this maintained a somewhat 



Figr. 16. 



Fisr. 15. 



Fig. 14. 



horizontal position. Occasionally the Eotifer burrowed into 

 organic matter on the slide or swam directly forwards, and, 

 when swimming, it often turned on its side and remained so for 

 a few seconds. It was while the Eotifer was in this position 

 that fig. 15 was drawn to show the peculiar bent arrangement of 

 the foot and toes, and also the form of the spurs, of which one 

 is shown, the other being hidden by it. 



27. Philodina citrina, Ehren. — The bdelloid Eotifers are, 

 generally speaking, the most difficult to examine and identify. 

 A good procedure, I have found, is first to examine the specimens 

 in the water of the collecting bottle containing them, not 

 attempting to get rid of the organic or other sediment which 



