216 MICROSCOPY FOR BEGINNERS. 



trochee, and somewhat resembles the Chilodon shown in 

 Fig. 128. 



8. ROTIFER VULGARIS (Fig. 148). 



This is the commonest of all the Rotifers. The body 

 is spindle-shaped, tapering to both ends when the two 

 ciliary disks are unfolded. The foot has two short toes, 

 and can be drawn into the body by its telescopic 

 joints. Between the two ciliary lobes is a cy- 

 lindrical projection ciliated on the tip, and near- 

 ly always bearing two little red eye-spots close 

 together. It is called the proboscis. When 

 hungry the Rotifer clings to the slide by her 

 two toes, expands the ciliary disks, and sends a 

 food-bearing current through the mouth to the 

 mas t ax< When desirous of changing her place, 

 she may either loosen her hold with the toes 

 and be carried through the water by the action of the 

 cilia, or she may fold the ciliary lobes together and go 

 looping about by clinging with the tip of the proboscis 

 while she draws up the foot, when, fastening it to a new 

 point, she lets go with her proboscis, extends the body, 

 takes a new hold with the foot, and thus moves about 

 quite rapidly, somewhat after the manner of the " meas- 

 uring-worms." 



9. STEPHANOPS (Fig. 149). 



There are several species of these pretty little Roti- 

 fers, all of which may be known as members of this 



