ORDER ACTINOIDEA. Al 
obliquely, and showing the radiating visceral lamelle, which connect 
it with the sides of the visceral cavity. In figure 3d, only two oppo- 
site lamelle are in view, while in figure 3c, which is an oblique 
section, crossing the cavity below the stomach, the edges of several 
of the intersected lamelle are exposed. In the last-mentioned figure, 
the stomach is seen to terminate in a kind of disk, which is the mus- 
cular arrangement for closing its lower extremity. The oblique 
position of this disk is unnatural, and resulted from the section of 
part of the lamelle and their consequent unequal contraction; the 
animal is drawn just as it was presented in the dissection. In 3, the 
upper extremity shows the tentacles as they are concealed in the con- 
tracted animal. It thus appears that the visceral cavity is divided by 
the lamelle into a series of compartments, as in the Actinia. A 
second series of narrower lamellz les between the larger, as is shown 
in figure 3d. ‘These narrower lamelle, however, are prolonged on the 
under side of the disk to the stomach, so that in making the section 
here referred to, the upper portion removed, presented below twice 
as many radiating compartments as were seen in the part figured. 
There is hence a close analogy with the Actinia, although the ani- 
mals differ so strikingly in the relative sizes of the stomach and 
visceral cavity. This resemblance is seen farther in the position of 
the spermatic cords. 
33. Spermatic cords border the larger lamelle, and extend from 
below the stomach nearly to the bottom of the visceral cavity. They 
are convoluted throughout their length, as is shown in figures 36, 3¢, 
and 3f. It is remarkable, that in one of the specimens, the convolu- 
tions are very few, and the cord stops far short of the bottom. ‘This 
fact may be accounted for on the principle that they are periodically 
developed.* 
Spermatozoa were not observed in these cords, yet it is altogether 
probable that on farther examination they will be detected, as in the 
Actinia. Vibratile cilia were distinct on the cords, but were not seen 
on the lamelle to which they were attached. 
The specimens examined contained no ovules. From analogy, we 
should expect that in the proper season they would be found in 
clusters, attached to the intermediate series of narrow lamelle. 
34. Besides the spermatic cords, there is attached to the edge of 
each larger lamella, immediately below the stomach, a pair of flat 
* The season when these observations were made was the month of August, 1840. 
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