250 A. EF. Verrill--The Bermuda Islands; Coral Reefs. 
broken spiral bands or rings of white, often a little raised or 
thickened. Its body or column is sometimes 2 inches or more in 
diameter and 4 to 6 inches or more high, while the disk in full 
expansion may be 3 or 4 inches broad and the longer tentacles 4 to 
5 inches long. Thus its total expanse may be nearly a foot, but such 
large examples are rare, while those of half that size are common, 
In full expansion the column is often tall and narrow. When large 
it is frequently so firmly attached in some deep hole or crevice of 
the reefs that it cannot be extracted entire without cutting away the 
stone. 
102 1038 
Figure 102.—Aiptasia annulata. Disk and tentacles of a young specimen, pre- 
served in formalin, enlarged ; a, 6, gonidial grooves; I-I''"’, six primary 
tentacles ; I, I*, directive tentacles ; II, second cycle ; ILI, third cycle; IV, 
fourth cycle ; V, fifth cycle of tentacles. 
Figure 103.—Tentacles of a larger specimen in formalin, more enlarged. Both 
drawn by A. H. V. 
The color is somewhat variable. Very often the column is olive- 
green, the disk paler green, with the lips whitish, especially at the 
gonidial grooves, and with pale radial streaks at the bases of the 
tentacles ; the tentacles may be pale green annulated with narrow, 
raised, flake-white rings or short interrupted spirals (in var. solifera), 
or they may be pale translucent with separated narrow bands of 
olive-green or brownish,* so as to give a beaded appearance (var. 
monilifera, nov.y. Frequently the column is pale yellowish or light 
* Probably due to clusters of zodxanthelle (see Duerden, op. cit., p. 356, 
1902.) 
