272 
Holothuria floridaiia 
and Fig. I shows a monster composed of 6 stone-canals with the madreporites form- 
ing a common enlarged madreporic body, while the stone-canals are shortened and 
Fig. I. Six stone-canals with madreporites fused, x 
independent except the middle two, which have grown together. Only one stone- 
canal was found with 2 branches. 
TABLE XXIII. 
Stone Canals, 
Adult ; 73 Specimens 
Yodng; 45 Specimens 
Number 
Greatest 
Length 
mm. 
Average 
Length 
mm. 
Number 
Greatest 
Length 
mm. 
Average 
Length 
mm. 
Eight 
Left 
Total 
Eight 
Left 
Total 
Mean 
Standard Deviation ... 
Coefficient of Variation 
Range of Variation ... 
21-589 
-1-1-255 
15-903 
-t- -888 
73-663 
+ 4-112 
4—88 
15-836 
+ -980 
11-894 
+ -664 
75-104 
+ 4-192 
1—61 
37-479 
+ 1 -954 
24-748 
+ 1-381 
66-030 
+ 3-686 
5—149 
7-959 
± -327 
4-140 
+ -231 
52-016 
+ 1-287 
3—21 
5-368 
+ -137 
1-734 
+ -097 
32-311 
+ 1 -804 
l-5_10-5 
6-223 
+ -410 
4-076 
+ -290 
65-504 
+ 4-657 
1—15 
3-556 
+ -256 
2-543 
+ -180 
71-523 
+ 5-085 
0—11 
9-556 
+ -605 
6-021 
+ -430 
63-006 
+ 4-410 
2—25 
3-444 
+ -228 
2-266 
+ -161 
65-806 
+ 4-678 
1—7 
2-983 
+ -150 
1-488 
+ -106 
49-683 
+ 3-532 
1-0—6-0 
In the adult the mean number of right canals is 22, with a range of 4 — 88, 
and of left canals 16, with a range of 1 — 61. In the young the mean number of 
right canals is 6, witli a range of 1 — 15 ar^d of left canals 4, with a range of 0 — 11. 
Thus the mean number of right canals is 36 "/^ greater than that of the left in the 
adult and 75 "/^ greater in the young. This interesting asymmetry is noted for a 
number of species by Ludwig, 1889-92, p. 132, who gives H. mexicana with 
8 left and 3 right canals. I find that 78 of both the adult and young have the 
