REPORT OF COMMISSIONERS OF INLAND FISHERIES. 91 



ration. Three of the lobsters were in a normal condition, that is, 

 they had no other appendages which were regenerating; the other 

 six had various appendages in the process of renewal. The obser- 

 vations were continued through the middle of October, but no posi- 

 tive evidence of regeneration was apparent. 



In view of the fact that Herbst and Miss Steele have obtained such 

 remarkable results in the regeneration of the eye in the crayfish and 

 other decapods it may be expected that these results will be modi- 

 fied by further experiments, although I am not aware of any account 

 of regeneration in the eye of the lobster. But while the present re- 

 sults may not be sufficient to justify a positive statement, it is cer- 

 tainly evident that the regeneration of the eye is comparatively very 

 slow, especially when it is considered that in the same lobsters and 

 at the same time other appendages were regenerating in a normal 

 way. 



Abdominal Appendages. The first pair of abdominal appendages 

 are modified into external reproductive organs. Several observa- 

 tions were noted of their regeneration. In experiments with the 

 other four pairs of abdominal appendages, or s\\dmmerets, positive 

 results were obtained in the second and third pairs, and it seems safe 

 to say that all the swimmerets will regenerate. Fig. I, 2, Plate XXI, 

 shows the regenerating bud of the second left swimmeret; in Fig. 

 II is seen the same appendages after moulting. Several instances 

 were also noted in which the swimmerets regenerated from different 

 levels, as, for example, the restoration of the endopodite and exopo- 

 dite when one or both were removed. 



It may be of interest to note that the swimmerets do not seem to 

 regenerate readily in the crayfish, at least Miss Steele did not meet 

 with success in obtaining their restoration. Morgan, from his ob- 

 servations with the crab, suggests that the comparative weakness in 

 the power of regenerating the swimmerets may be partly due to a 

 smaller supply of food material as compared with the thoracic ap- 

 pendages.* This interpretation will be referred to again. 



*Morgaii. Zoological Bulletin, Vol. T, No. 6, p. 299. 



