GENERAL INTRODUCTION 



now begins to grow faster at two places than at intermediate points, 

 as shown in Fig. 40, H. The new tail, although very short, assumes, 

 as a result, the characteristic bilobed form. The point of special 



H 



FIG. 2. A. Allolobophora fastida. Normal worm. B-F. Anterior ends of worms, which, after the 

 removal of one, two, three, four, and five segments, have regenerated the same number. 

 G. Anterior third cut off. Only five head-segments regenerated. //. Worm cut in two in 

 middle. A head-end of five segments regenerated. /. Worm cut in two posterior to middle. 

 A heteromorphic tail regenerated at anterior end. 



interest is that the new material that appears over the exposed edge 

 does not first grow out at an equal rate at all points until it reaches 

 the level of the original fork, and then continue to grow faster in two 



