FAUNA OF THE CHESS AND GADE. 455 



therefore easy. This specimen is shown in fig. 17, in a 

 position in which it remained for a long time, with its foot 

 embedded and partly hidden in a small quantity of sedi- 

 ment on the slide. The separation of the trunk from the foot 

 was abrupt, and the nearly horizontal antenna and the 

 well-expanded wheels were clearly seen. Two features of 

 the Eotifer were particularly attractive, viz. its two elongated, 

 brilliant red eye-spots, which were inclined towards each other, 

 and the clear, bright amber colour of the greater part of its 

 body. I do not expect to obtain a finer specimen of the species, 

 and it seems remarkable that it was obtained from the canal, 

 and also that the finest specimen of Rotifer vulgaris was obtained 

 from the same canal, although not from the same section of it. 



28. Colurus caudatus, Ehren. — This Eotifer was obtained, 

 on July 21st, 1913, from the inner moat at Berkhamsted Castle. 

 Its lorica was stout and pear-shaped, the large part being 

 towards the hinder end, which terminated in two short points. 

 From the anterior end of a ventral slit in the lorica proceeded a 

 long, jointed foot, tapering to a fine extremity and carrying two 

 thin toes. The Eotifer was almost incessantly on the move, 

 and its movements were too complicated to allow its parts to be 

 seen to advantage. After a time it was narcotized, and the 

 structural features mentioned above were much better seen, 

 while the peculiar hood of the Eotifer, appearing in side-view 

 like a curved and strong spine, was very conspicuous. 



29. Pedetes saltator, Gosse. — This, one of the skipping or 

 leaping Eotifers, has usually been obtained from Chipperfield 

 Common Pool, which is particularly rich in specimens of skip- 

 ping Eotifers. The body, seen in dorsal or in ventral view, was 

 not unlike a bag with the middle of the bottom of the bag pulled 

 out somewhat, and with the mouth of the bag moderately drawn 

 in or constricted. Two red eye-spots, close together, were 

 always seen near the oral end; but the most striking features 

 were the two leaping processes, which were much longer than 

 the body and extended from the anterior part of its ventral sur- 

 face. By the rapid movement of these processes the Eotifer was 

 suddenly propelled across the field of view, or sometimes quite 

 out of it ; at other times it swam leisurely along, at the same 

 time turning about its long axis. 



