THE TENTACLES. 425 



When expanded, the margin of the disk forms a 

 distinct crenated rim, outside the tentacles, always 

 brilliantly coloured. This rim is everted in the most 

 complete expansion, the tentacles spreading over it, 

 and the disk dilated beyond the diameter of the body. 

 But a more common state is that of a short cylinder, 

 the rim upright, and the tentacles crowded in nearly 

 peqiendicular rows, and scarcely projecting over the 

 edge. (Fig. 10.) The tentacles have exactly the 

 same form and structure as in Carijojihyllia SmitJiii, 

 consisting of a rather short thick body tapering from 

 the base upward, and studded with transversely-oblong 

 warts, and of a large globular head, diverse in colour 

 and surface from the body, and covered with a dense 

 coat of short down. They are arranged in two com- 

 plete marginal rows, and two incomplete and irregular 

 discal rows. T counted them in one specimen, and 

 found the exterior rows to contain twenty-four each, 

 and the interior about eighteen each ; making the 

 total number eighty-four. In another there were 

 more than one hundred, and then there were four 

 compact rows, besides smaller scattered ones on the 

 disk, so that I feel sure the number and arrangement 

 of these organs form but insufficient specific characters, 

 especially since we know that in the Actiniae they 

 increase with the age of the animal. 



The oral disk is usually concave, the mouth, how- 

 ever, rising into an oblong cone. The disk is marked 

 as usual with radiating lines. The mouth forms two 

 projecting lips, which are strongly crenate, like the 

 edges of a cowry-shell. The whole appearance of the 

 disk, tentacles, lips, and all, is almost exactly a 



