164 BULLETIN OF THE 
the embryonic polypite. A larva of Agalma in a stage following the Athorybia 
stage bears a remote likeness to the genus Physophora. Although the resem- 
blance is somewhat distant, for want of a better name I have called it the 
Physophora stage (Plate IX. fig. 1). 
In this stage the tasters are arranged in a circle on an enlargement of the 
axis of the larva opposite the end which bears the float. "This is a true char- 
acteristic of Physophora. Although nectocalyces are well formed, there is a 
section of stem between this terminal enlargement of the axis and the lowest 
nectocalyx which bears covering scales. This last feature separates the young 
Agalma from the genus Physophora. On the same enlargement which bears 
the circle of tasters there are two polypites, an embryonic, which is the modified 
yolk sac with the tentacle from which embryonic knobs are pendent, and a poly- 
pite with the characteristic tentacle and knobs of the adult. Both of these arise 
from the axial enlargement at the end of the stem. From a point on the axis 
just below the lowest nectocalyx hangs a single taster with tentacle, and. small 
buds which later grow into polypites. 
` Tentacular knobs of both kinds coexist in this stage, but they are never 
found together in Agalmate in which there are more than four pairs of necto- 
calyces. No provisional or embryonie organs appear in stages between the 
Physophora stage and the adult Agalma. As far as tne anatomy of the adult 
Agalma is concerned, I have little to add to what has already been given by 
others. In the arrangement of different individuals on the stem there is always 
a definite sequence, and the different individuals are never displaced from their 
proper order. Nectocalyces are always found on the nectostem, while feeding 
polyps, tasters, and sexual bells follow in an order which is exactly reproduced 
in different sections of the polyp stem. If we take a single such section the 
order is found to be as follows. Beginning with the upper end, there is found 
at first a polypite, just below which is the grapelike cluster of female bells. 
Removed by a considerable space on the stem from. these, there is a cluster of 
tasters surrounded by male bells, and then, after another interval of about the 
same length of stem, another polypite with female bells and the beginning of a 
new section, which if followed out would be found an exact repetition of the 
preceding. This sequence is normally followed, whatever the length of the 
stem may be. New members of the polyp stem arise in the region just below 
the lowest nectocalyces. New nectocalyces always form on the nectostem just 
below the float. 
In the Agalma which is figured in Plate X. there are seventeen pairs of nec- 
tocalyces, and seventeen sections bearing polypites and female sexual bells. 
This numerical identity is not a coincidence, but seems to occur normally in all 
stages of growth after that called the Physophora larva. 
The development of the adult feeding polyp or polypite of Agalma seems to 
be quite peculiar. The feeding polyp originates as a simple two-layered bud 
from the stem, and assumes at first a globular shape. From this it elongates 
into a flask-like body, the proximal portion of which retains a spherical form, as 
shown in Plate IX. fig. 5. This spherical basal part is formed almost entirely 
