TNLAXI) FISHEKIKS. 73 



October 25th. 

 C 20 (?) two arm 8-10 mui., no trace of other. 



E 22 no trace of req'eneration. 



F 



\ on ^^ ^^^'^ arm, 6 mm. ; no trace of another. 



JiOri'ui/'cr otli . 

 25 mm., two new arms, 2 mm. each. 



" two new arms, 9-10 mm., no trace of other. 

 " one new arm directly in middle, 1 mm. long. 

 (?) one arm, -^h; mm., no trace of rest. 



Xocember 11th. {Fig. 30.) 

 23 mm., two small arms, about 3 mm. 

 two small arms, 10 and 12. 

 one arm, 1^ mm., directly in middle, 

 one arm, 6 mm. 

 (no trace of other arms in any.) 



Some other experiments of a similar kind performed upon youug* 

 stars abont the first of Angnst jdelded essentially the same re- 

 sults, with this exception : that out of the seven pieces which lived 

 until Septeml)er 5, four were those Avithout madreporic plate, and 

 three of these were regenerating- new arms. Miss King-, whose 

 ■recent article has been already referred to, seems to have had 

 better success than I, and says that from ea(^h of the pieces of a 

 star cut in two a new star may be formed by regeneration. 



That the madrepcn-ic jilate is not essential to the life of the star- 

 fish, at least for a very long time, is shown by another experiment. 

 This organ was removed from five large stars on June 1-1, and on 

 November 5 one of them was alive and healthy, but had not re- 

 generated the lost structure. The madreporic plate was wanting- 

 in one specimen caught at Woods Hole on April 4. Another 

 specimen was taken which had an accessory madreporic plate, 

 which was not, however, connected with the stone canal. In the 

 last report, I mentioned an experiment in which this body was 

 extirpated and reg-enerated before the end of the season. 



10 



