90 REPORT OF COMMISSIONERS OF INLAND FISHERIES. 



which mark the formation of the future joints and segments of the 

 limb.'^ The papilla and young bud are first white and then become 

 pink in color. Later the color becomes darker, and just before 

 moulting the whole bud usually presents a very dark bluish red or 

 purple color. The appearance of this dark color is valuable to 

 fishermen as an index of an approaching moult of the lobster. 



Both chelipeds and the four pairs of walking legs regenerate from 

 the breaking plane. The phenomenon of regeneration at different 

 levels will be described later. 



Antennce. — The antennae, as has already been noted, are very 

 liable to injury, but they do not possess the power of autotomy. 

 This may be due to the fact that even a part of the antennae may 

 still be of service to the lobster, and therefore a provision for its 

 autotomy is unnecessary. 



Both antennae and antennules regenerate very readily at any 

 level, either in the long flagellum or the articulations at the base. 

 When the flagellum regenerates from its base the growing bud soon 

 assumes a sickle shape and then coils upon itself in a spiral form. In 

 some cases as many as fi^'e or six bright red colored spirals were ob- 

 served just before a moult. When regeneration occurs in the seg- 

 segments of the flagellum a bud does not appear externally but the 

 development takes place within the broken tip, and the new part of 

 the antenna is only apparent after the next moult. Both methods 

 of renewal seem to be an admirable provision for preventing an undue 

 exposure of the delicate buds to injury. 



The Eyes and Maxillepeds.- — The maxillepeds, although not so 

 liable to injury as the antennae or limbs, seem to possess a compara- 

 tively normal power of regeneration. 



In the experiments on the e3^es the results were not conclusive. 

 The eyes of nine lobsters were mutilated either b}^ the removal of a 

 part of the cornea or of the whole eye-stalk. The lobsters averaged 

 about eight inches in length; the mutilations were made in the latter 

 part of July and the first week in August, and in most cases soon 

 after a moult, thus securing the most favorable conditions for resto- 



