248 CHARLES R. STOCKARD. 



rial, retained the power to grow into a large chela of typical form 

 in seventeen cases. One of these cases, specimen 23, is remark- 

 able, since at the first operation the small chela which was on 

 the left side and the other four left appendages were all removed 

 and regenerated at the next moult. After this moult the large 

 chela of the right side was amputated along with the four pos- 

 terior legs of the left side, thus leaving only the regenerated 

 small chela on the left side while the four posterior legs remained 

 on the right side. Nevertheless, the left small chela grew into 

 a great chela and the four more posterior left appendages re- 

 generated for the second time. The case seems an extreme test 

 of the power of one side to regenerate all of its posterior legs for a 

 second time and in addition to change the first chela from the 

 small to the large size and type. Specimen 25 further indicates 

 this remarkable power of the side of the individual with less 

 material to replace all lost parts and at the same time increase 

 the size and type of its first chela. 



The remaining two of the nineteen cases, specimens 9 and 18, 

 present the first chela? equal in size after the moult following 

 the second operation. Specimen 9 had in the first case the great 

 chela removed from the right side and the third, fourth and 

 fifth appendages from the left side. The greater amount of 

 material was, therefore, still on the right side, yet the small 

 first chela of the left side became larger after the moult. The 

 second operation removed the great left chela and the second, 

 third, fourth and fifth legs of the right side. After the moult 

 all of the amputated legs were regenerated but the regenerated 

 left first was small, and the right first appendage had not in- 

 creased in size. Thus the first pair were symmetrical in respect 

 to size yet the right first or old chela had slightly approached 

 the large chela type. The specimen 18 responded in a closely 

 similar fashion. 



The type of the chela is equally, if not more, important than 

 the size since Przibram found the chelae to be of almost equal 

 size in some cases but of reversed type, and the great type in- 

 variably increases in size at the following moult. 



The experimental evidence in the first case, then, does not 

 support the idea that the side with most appendage material 



