REPORT OF COMMISSIONERS OF INLAND FISHERIES. 123 



asymmetrical type^ only in this specimen the right chela (Fig. 33) 

 was the crusher, and the left, the nipper (Fig. 32). They both 

 measured 162 mm. in length. 



Soon after the amputation another pair of chelce began to regener- 

 ate. By the time the segments of the future limbs were well out- 

 lined, the two regenerating chelse in this case again looked very much 

 alike. And the fact that their external characteristics also resem- 

 bled those of a crusher, led me to anticipate that both limbs would 

 develop chelse of the "crusher" type. By the middle of October, 

 1906, the lobster had moulted and regenerated both chilipeds and 

 the second left leg. When the chelse had hardened and assumed 

 their normal shape, they were practically equal in size and each 

 measured HI mm. in length. Both chelipeds were remarkably 

 similar in structure and each displayed the characters of a true 

 "crusher" claw. The second left leg had also regenerated, but it, 

 as well as all the other appendages, were in a normal condition. 



After these lobsters had moulted, the limbs were again removed 

 and an attempt made to keep the lobsters through the winter in order 

 to see what type of chelse would be reproduced by the next regenera- 

 tion. Unfortunately, the unnatural conditions under which it was 

 necessary to keep lobsters during the winter resulted in the death 

 of lobster No. 8 on January 6, 1906. But so far we have been more 

 successful with the other specimen, and lobster No. 9 is at the present 

 date (February 1, 1907) still in a healthy condition at the experiment 

 station. It may yet be possible, therefore, to obtain an answer for 

 the question as to what will be the character of the next regenerated 

 chelse. 



b. Morphological Comparison of the Normal and Regenerated Chelae. 



Specimen No. 8. Figs. 24-31. 



The morphological comparison of the normal and regenerated 

 chelse of the lobster may be best presented by making, first, a detailed 

 analysis of some of the characters not clearly shown in the photo- 



