248 
Holothuria Jloridana 
II. a, the ground-colour is marked with dots, spots, blotches, streaks, or more rarely 
rings, of different tints. Altogether the rings occur 37 times, 28 being in the 
browns and 9 in the creams. The party-coloured coats of these Holothurids are 
often very beautiful and sometimes present most fantastic combinations of nearly 
all the possible tints and shades of the browns, creams, and grays from black to 
white. 
Because of the great contraction of the anterior end of the body and of the 
retracted tentacles one is liable to make errors in counting tentacles even with 
the exercise of considerable care. After the first determinations, in working out 
the relation of these organs to the symmetry and the correlation of tentacles and 
ampullae, the various parts were spread out. In many cases a seeker was passed 
from ampulla to tentacle and in others Prussian blue was injected, either through 
the radial canal, or the ampulla. Thus, in several specimens, it was found that, 
in the previous count, short stumps of tentacles had been overlooked. 
a. Symmetry in Arrangement of Tentacles and Ampullae. 
Normally there are 20 tentacles arising from the radial canals and distributed 
evenly in the interradii as shown in Fig. A. See Plate V. 
Fig. a, represents the scheme for the symmetry in the arrangement of the tentacles, tentacle ampullae, 
dorsal mesentery, and calcareous ring. 
A dotted line indicates the median plane passing through the mid-ventral radius, the mid-dorsal inter- 
radius, and the attachment of the dorsal mesentery to the mid-dorsal interradiale. MVR, mid- 
ventral radius ; EVR, right ventral radius; LVR, left ventral radius; EDE, right dorsal radius, 
LDR, left dorsal radius, dl, d2, the tentacles dorsal, and vl, v2, ventral, rl, ?-2 right, and 11, 12 
left, of the radius marked ; OC, oral canal ; OE, oesophagus ; EC, radial canal ; T, tentacle ; 
TC, tentacle canal ; TA, tentacle ampulla ; E, radiale ; IE, interradiale. 
Variations from the Symmetry of the Tentacles of the Mid-Dorsal Inter- 
radius in Relation to the Attachment of the Mesentery. 
The simplest pattern in asymmetry is where the number of tentacles is normal, 
and among those for the dorsal interradius one more than usual is found on one 
side or the other of the mesentery. Including this kind of asymmetry found in 
individuals having at the same time more or less than the normal number of 
tentacles, there are, in all, 27 cases in which the tentacles of the dorsal inter- 
radius are distributed as follows: — 
D. Tentacles and Ampullae. 
Number 
of Cases 
To Eight 
of Mesentery 
To Left 
of Mesentery 
12 
8 
1 
4 
1 
1 
3 
1 
3 
1 
4 
1 
1 
3 
2 
2 
1 
4 
