64 INLAND FISHERIES. 



sometimes tear a star in two by pulling on the arms, while the 

 latter still remain on the fragments of the disc. On the other 

 hand, if the suckers are cut off from one arm, or the arm is crushed 

 or cut several times, it will usually drop off, always at the same 

 point near the disc, taking- the sexual glands with it. 



On the 26th of September five of the larger stars in the origi- 

 nal car were deprived of the arm opposite the " eye," or madre- 

 poric plate, and then placed in a car with barnacles for food. The 

 subsequent measurements show that they kept on eating and 

 growing at about the usual rate, like the specimen similarly 

 treated in the last experiment described. The measurements are 

 given in tabulated form below, the first measurement indicating 

 the length of the longest arm. 



Sept. 26. Oct. 12. Oct. 25. ISfov. 5. Nov. 21. 



A comparison of the table with that on page 61 shows that these 

 stars, which are regenerating an arm, grew at about the same rate 

 as the complete stars during the same period. The rate of regen- 

 eration was also about the same as the rate of groAvth in the origi- 

 nal arms, except that toward the last the new members grew in 

 some cases somew-hat more rapidly. 



Another experiment was made, similar to the above, except that 

 two arms w-ere taken off instead of only one, and the stars were 

 younger at the beginning. The stars were at first all about 12 m. 

 m. The eight detached arms were put in the car also, and on 

 September 10th, twenty-six days after they were detached, five 

 were still alive and apparently in good health, but had neither 

 grown nor shown any sign of regeneration. One is figured nat- 

 ural size in Fig. 24 B. 



