210 
BUNODIDiE. 
sometimes having a tendency to run in longitudinal lines, but more 
generally irregularly scattered, leaving intervals of three or four times 
their diameter in ordinary states of distension, and these intervals have 
often a silky lustre. Substance firm and even cartilaginous. Margin 
entire, but roughened with the scattered waits, forming a thick parapet, 
separated from the tentacles by a broad fosse. In freedom, the column is 
generally more or less disguised by fragments of stone and shell adhering 
to the suckers. 
Disk. Flat, circular in outline, plane but overarching. Radii con- 
spicuous chiefly by colour. 
Tentacles. Arranged in five rows, the first set at about half radius, — 
5, 5, 10, 20, 40 = 80; the first and second so nearly equidistant from the 
centre as to seem but one. Their form is conical, thick at the foot, 
regularly tapering to a point, which is sometimes slightly inflated. The 
animals appear to have the power of changing the shape of these organs at 
will ; for I have had individuals, in which the tentacles, after having for 
a while bonie the ordinary conical form, suddenly became nearly cylin- 
drical, with truncate extremities, and maintained this form for a long time. 
These organs are nearly equal among themselves, and their length is about 
equal to one-third of the diameter of the disk. They are capable of little 
flexure, and are generally spread in a regular star-like manner, the outer 
rows deflected, the inner erect, and the intermediate ones horizontal. They 
are powerfully adhesive. 
Mouth. Frequently elevated on an eminence of varying form and 
dimensions. Throat and stomach often protruded to such an extent as to 
conceal the whole disk. Qonidial tubercles two pairs, small. 
Colour. 
Column. Dull green, streaked and flaked with crimson, with pale grey 
warts. 
Disk. Glaucous-olive, with conspicuous radial bands proceeding from 
each outer tentacle, in pairs, which curve around the foot of each tentacle 
of the higher rows, and are lost at varying distances from the centre ; 
those paii-s which enclose the inner tentacles extend farthest and are most 
conspicuous. The colour of these bands is scarlet, often edged with white, 
and they are highly characteristic of the species. 
Tentacles. Pellucid light bi'own, with a band of opaque white across the 
foot, which frequently stretches a little way up each side: a broad baud 
of crimson surrounds the middle, bounded below, and sometimes above, by 
a narrower band of sub-opaque white. All these bands are undefined, and 
are often rendered sub-pellucid by distension. 
Mouth. Generally tinged with crimson. Gonidial tubercles crimson. 
Throat and stomach light grey. 
