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W. N. Rice—Animal of Millepora aleicornis. 181 
the writer was favored with the kind assistance of Mr. G. 
about all hours of the day and night. Only once were we 
favored with a sight of the zooids in expansion. Though that 
observation was far from being as satisfactory as could be 
desired, the writer has thought it might be worth while to give 
an account of it; for, on a subject so important and presenting 
such difficulties to every observer, every scrap of observation 
is probably worth saving. 
The zooids which we saw in expansion showed generally a 
pretty regular whorl of tentacles at the summit. There seemed 
to be indications of a tendency to a grouping of the tentacles 
In one or more whorls below the one at thesummit. But these 
sometimes three. As regards the arrangement of the tentacles, 
our observation is therefore substantially in agreement with 
those of Agassiz and Moseley. We feel very confident that 
the tentacles are not in uniform and regular whorls of four, as 
figured by Nelson and Duncan. _ 
Pea eg 
The accompanying figures, 1 to 20, represent the outlines of 
several zooids in the various positions in which they chanced to 
present themselves, The drawings were made hastily while the 
pecimens were under examination. It is needless to remark 
that they make no pretension to any artistic character. What- 
ever value they may have arises from the fact of a conscien- 
tious endeavor to draw exactly the outlines which were seen, 
not a line being added hypothetically or inferentially. Figures 
Am. Jour. Bios seman Vou. XVI, No. 93,—Sxpt, 1878. 
