NATURAL HISTORY OF THE STAR-FISH. 
223 
of the disk on the other. The smaller pieces perished, but the larger ones lived for 
several weeks and showed no sign of regeneration. All but one were destroyed by other 
star-fishes which got into their compartment of the car by accident. The remaining 
fragment, consisting of three arms and part of the disk, lived several months after 
the operation and did not regenerate. 
On May 11, 1898, several stars about an inch long were cut as in fig. 27. One 
arm was pulled off and the disk then cut in two, leaving two arms with a part of disk 
and madreporic plate on one piece (= ft), and two arms and part of disk on the other 
piece (= b). The fate of the single arm has been already considered (page 222). On 
June 9 all the pieces were alive. In the piece marked a (i. e., having madreporic 
plate) a trace of a new arm was visible on the side toward the lost arm, but in no 
other place. The pieces marked b showed no regeneration at all. 
On June 25, 6i weeks after the operation, the condition was as follows: All these 
parts of specimen 1 were alive. The fate of the single arm has been mentioned 
previously. The piece (a) with madreporic plate is sketched from the lower side in 
fig. 28. Two arms were well started and one minute arm was growing out between 
them. In the other piece ( b ) of this specimen, the wound was completely healed, but 
there was no visible trace of any new arms. Of specimen -2, only one piece (ft) was 
alive. From the stump of the old arm a very small new arm appeared— no trace of 
any other. The two pieces a and b of specimen 3 were alive and healthy. In a two 
very small arms were visible (one could be seen only with the help of a hand lens) 
near together, and on one side of the cut surface; on the other side there was a trace 
of another arm, indicated by an eye-spot, b had healed up, but showed no trace of 
regenerating arms. Of the fourth specimen, piece « was alive with two very minute 
regenerating arms. These specimens had very little food, and it is hardly necessary to 
remark that they grew very little or not at all. 
On September 5, 1898, another experiment, similar to the last, was commenced 
at Kickemuit Fiver. Eight specimens were taken from those reared in the car and cut 
in two in the manner shown in fig. 29, leaving two arms and the madreporic plate on 
one piece and three arms and part of the plate on the other. The pieces of the latter 
sort died in a short time, and the following data refer to the pieces having two arms 
and the plate (“eye”). At the beginning of the experiment the specimens measured 
October 25: 
C, 20 (?) , two arms 8 to 10 mm. ; no trace of other. 
E, 22, no trace of regeneration. 
( 21 
F, ) 20 * • t one arm ’ 6 mm. ; no trace of another. 
November 5: 
A, 25 mm., two new arms, 2 mm. each. 
C, 21 mm., two new arms, 9 to 10 mm. ; no trace of other. 
E, 22 mm., one new arm directly in middle, 1 mm. long. 
F, 19 ( ?), one arm, 4J mm. ; no trace of rest. 
November 11 (fig. 30) : 
A, 23 mm., two small arms, about 3 mm. 
C, 21 mm., two small arms, 10 and 12. 
E, 21 mm., one arm, li mm., directly in middle. 
F, 20 mm., one arm, 0 mm. 
(no trace of other arms in any.) 
Similar experiments upon young stars about the first of August yielded essentially 
the same results, except that out of seven pieces which lived until September 5 four 
were without madreporic plate and three of these were regenerating new arms. Miss 
King, whose recent article has been already referied to, seems to have had better suc- 
cess than I, and says that from each of the pieces of a star cut in two a new star may 
in millimeters, 23, 21, 21, 20, 19, 18, 18, 18. 
September 26, 3 weeks after the operation : 
A, 22 mm., bore trace of two new arms. 
B, 18 mm., two new arms (preserved) unhealthy. 
C, 18 mm., one new arm, 2 mm. 
D, crushed. 
E, 20 mm., healthy; no trace of another arm. 
E, overlooked. See next, Oct. 12. 
October 12 : 
A (?), 23 mm., two very small arms. 
C, 20 mm., two arms, one smaller than the other. 
E ( ?), 22 mm., no trace of regeneration. 
F, 21 mm., one arm. 
(all healthy.) 
