13S 
Moscularia coronetta. 
["Monthly Microscopical 
L Journal, Sept. 1, 1869. 
in length those on the anterior knobs. This, therefore, is the 
distinctive modification of the dorsal lobe in this species ; and when 
these distinctions are so persistent in every animal of this genus, it 
suggests the probability of an analogous distinction in the isolated 
species of the genus Stejphanoceros. I have not hitherto been able to 
detect the slightest departure externally from the form of the other 
lobes, but, though not in support of the assumption, have been made 
aware of a perfect band of very small setae running continuously 
round the interior of the funnel at the bases of the lobes, exercising 
the spasmodic action that distinguishes setae from vibratile cilia. 
The rotary organ of F. coronetta, as exemplifying the type of 
the genus, is situated internally at the cervical constriction of the 
body or neck, which is furnished with a collar extending horizontally 
round its entire circumference, divided diametrically in a lateral 
direction by a rounded process on each side (Plate XXY., Figs. 
5, 6, 7 c); these processes are set with active vibratile cilia, spring- 
ing from which and extending ventrally at a great angle of depres- 
sion is a minutely ciliated belt {d) attached to the contractile 
membrane, in which it here creates a considerable vertical constric- 
tion (Fig. 6) ; and from the ciliated knobs (c) the dorsal division of 
the collar (e) anastomoses with the vascular vessel that descends 
from the dorsal lobe, where it forms a similar rounded process (/), 
which with the collar is unciliated, but is permeated with the 
granular substance that circulates through the disc, and certainly 
contributes important service in the acts of swallowing and ejecting. 
The depression of the rotary organ is manifest in every species, 
for a lateral view exhibits, without exception, the labial diaphragm 
correspondingly depressed in the same direction. 
The ciliated processes are capable, at the will of the animal, of 
either vibrating intermittently, producing a similar jerking effect 
to that of the setae, or of working in regular sequence and creating 
a vortex, in which the particles are seen to revolve upwards through 
the rotary belt, and down along the dorsal lobe as shown by the 
arrows (Fig. 6). The animals appear to possess through the agency 
of the simple process the same faculty of discrimination in the 
selection of food that obtains in some, if not all, of the tube-building 
Eotifera, eminently so in Melicerta: thus the dorsal unciliated 
process is seen to approach, and, with the others, simultaneously to 
close upon the prey by means of a sudden contraction of the neck 
(Fig. 10), to retain the particle for an instant, and then either to 
reject or to swallow it, as the scrutiny may decide. In F. cam- 
panulata this action is very frequent ; the dorsal lobe is there 
vertically bulged or corrugated inwards down to the simple process 
which exhibits the most delicate sensibility, reaching forward as if 
moving on a pivot at the funnel rim at the approach of the minutest 
monad. 
