190 HOLMES. [VOL. II. 



The swimmerets, however, beat rapidly, and the maxillipeds 

 and gnathopods were in constant motion. The antennules 

 were moved more than the antennae, but their movements were 

 more jerky and irregular than in the adult. The next day 

 several others came out of the brood pouch of the mother of 

 their own accord. They were a little more active than those 

 that had been removed the day before and exhibited apparently 

 a faint negative phototaxis. They had been out only a short 

 time when they began constructing nests. These nests were 

 the same in shape as those formed by the adult, and the 

 behavior of the young in relation to the nest was almost exactly 

 like that of the older individuals. One of these young impaled 

 on a needle was presented to one of the same brood lying in 

 its nest. At first the animal gave signs of timidity and with- 

 drew further into its nest. After some waiting the animal 

 emerged a little and began waving its antennules in the usual 

 manner. When they touched the food the creature darted out 

 quickly, seized it, dragged it back, and proceeded to devour it 

 at leisure. Apparently, it is only one or two days after hatching 

 that the young get effective control of their movements, and 

 they probably remain at least that long in the maternal brood 

 pouch. When they are sufficiently active to make their exit they 

 are equipped for the business of life. It was a matter of some 

 surprise to observe how perfectly endowed the young are with 

 the instincts of the parent forms. Their behavior in almost 

 every respect seems exactly like that of the adults. The nest- 

 building, movements within the nest, such as waving the anten- 

 nules, retraction, reversal of position, springing out after food, 

 jumping after passers-by, signs of timidity, as well as the 

 general behavior outside the nest, are all carried on just as in 

 individuals many times their size. 



Regeneration . 



No attempt was made to study the power of regeneration in 

 Amphithoe, but it may be worth while to record a few observa- 

 tions that were made incidentally on the regeneration of the 

 antennae. The antennae were removed in several specimens 



