42 ZOOPHYT ES, 
branchia-like organs. In figure 36, they are seen in profile in their 
natural position (c’ to d’), and in the vertical view in 3d, one appears 
either side of each lamella; this is shown still more distinct in 
figure 3e. These organs are enlarged in figure 3f ‘They are 
transparent, and are transversely divided into narrow compartments, 
each about 35 of an inch in breadth. ‘The margin is crenated, corre- 
sponding with the compartments. Each compartment, as is more 
distinctly exhibited in figure 3g, is traversed along its middle by a 
distinct vessel, which terminates in a small process on the margin. 
Vibratile cilia were apparent on these organs, as is represented in 
figure 3g, and they were observed to continue in motion for an hour 
after separation from the animal. ‘These cilia were about 3000 of an 
inch in length. 
The two organs of each pair were united to a common duct, 
which, in the specimen examined, had a bluish colour, as shown in 
figure 3f; and by this duct they were attached to the margin of the 
lamella—one being situated either side—and thus their surfaces were 
free to be bathed by the water with which the animal distends itself. 
35. The structure of these organs is such that we can hardly doubt 
their branchial nature: yet no circulating fluid was detected within 
them. Lesueur, who observed them in his excellent dissections of 
West India species, calls them arcuated organs, and supposes them to 
‘perform the functions of the liver.” * 
The modes of nutrition in the Zoanthide, are the same as in the 
Actinia. 
The Tubipora. 
36. The structure of the Tubipora has been illustrated by Quoy 
and Gaymard, in the voyages of the Uranie and Astrolabe. ‘The dis- 
sections made by the author confirm in general their observations, yet 
differ in some points of interest. 
The Tubipora is a cylindrical animal, expanding above a star of 
eight tentacles. The animals are often of a lilac or rose tint, and 
crow in large clusters; and, as they appear beneath the water about 
the reefs, they are as perfect beds of pinks as those of our gardens. 
Figure 1, on plate 59, represents some of these polyps of the natural 
size; and figures 1@ and 2, two individuals of the same genus enlarged. 
The eight tentacles are fringed on either side by small papille, each 
of which has a minute puncture at apex. Both the papille and the 
cd 
* Jour, Acad. Nat. Sci., Philad., i. 183, 184, 185, and plate viil., fig’s. 1, 5, 9. 
