238 
ILYANTHIDiE. 
eleven A.M. only about an inch in length of the fore parts 
remained above the level of the sand, when it expanded, 
and seemed satisfied. At night, however, it came out of 
its burrow, and remained wallowing on the surface ; and 
for a week after this it continued to go in and out once or 
twice a day, grovelling and stretching awhile, and then 
burrowing comfortably almost to the tentacles. 
This individual still survives in the same vase, after 
six months’ captivity ; it frequently remains for days 
completely hidden, sometimes shows only the tips of the 
expanded tentacles, and rarely more than the disk, above 
the sand. It is perfectly domiciliated. 
Another of the individuals referred to gave birth, while 
under my observation, to some half-dozen or more embryos, 
of oblong or ovate form, which appeared like little Peachias, 
but I could not see any trace of disk or tentacles in any. 
They were discharged one by one through the gonidial 
tube, as the animal lay on its side. 
This one was ruptured in two places ; and as it lay in a 
small tank, the craspedal mesenteries were protruded, and 
spread in large irregular areas on the glass bottom, per- 
fectly flat and adherent, the membrane being pellucid and 
very delicate, and the craspedum bounding the outline like 
a white thread. 
The conchula is generally protruded, even wdien tlie 
tentacles and disk are wholly retracted. Perhaps it is the 
seat of some sensation. 
I. Mitchellii. 
Ilalcampa. hastata. Ceriantlius. 
tripliylla. 
uudata. 
and it was only after an hour’s labour, when the cavity liad become large 
enough to allow the polype to work in an upright position, and with the 
assistance of its whole weight, that rapid progress was made.” (Annals 
N. H. for Jan. 18.59, p. 78.) 
