C. L. Edwards 
279 
b. Branches on Tentacular Ampullae and Variation in their 
Number. 
Only 1 Holothurid, 151, varies from the norm in having branches to the 
ampullae. There are in all 25 branches distributed as follows: right dorsal radius 
d2{l), v2(l), mid-ventral radius rl(l), r2(2), ^2(1), (5), left ventral radius 
vl (1), v2 (1), d2 (1), left dorsal radius vl (2), v2(l), dl (8). This case is even more 
remarkable than 7 of H. floridana (p. 252), and since with a volume of 538 cm.' it 
is the largest individual in the series it shows that the branching of the ampullae, 
when it appears, is associated with the more advanced age. One specimen, 155, 
has 1 of its tentacles of small size. 
D. Pedicels and Papillae. 
a. Distribution per sq. cm. 
(Counted as in H. floridana, p. 253.) 
TABLE XXXI. 
DOKSAL 
Ventral 
Adult 
- 
Young 
Adult 
Young 
Number of Specimens 
Mean 
Standard Deviation 
Coefficient of Variation . . . 
Range of Variation 
12 
16-584+ 1-612 
8-281 ±1-140 
49-935 + 6-875 
8—30 
8 
.30-572 + 2-011 
7 -889 ±1-422 
25-807 + 4-652 
18—41 
12 
44-500 + 2-651 
13-617 + 1-875 
30-599 + 4-213 
21—74 
8 
72-714 + 4-114 
16-1.38 + 2-909 
22-194 + 4-001 
58—100 
Table XXXI. demonstrates that in the adult there are 2"6 as many appendages 
in the ventral region as in the dorsal, and in the young 2-4 as many. In both the 
adult and young the standard deviation is much greater in the ventral region*. 
Compared with H. floridana, the appendages are more numerous and crowded, 
especially in the trivium. Selenka, 1867, p. 326, notes that the ventral pedicels 
are more numerous in the older examples. Ostergren, 1907, p. 195, notes the 
presence among the larger pedicels of numerous very small pedicels which hold 
fast the protective covering of weeds and other foreign bodies. 
[* In this as in several other cases cited by the author, the statement as to variability depends upon 
using the standard-deviation and not the coefficient of variation as the measure of variability. — Ed.] 
