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POPULAR SCIENCE REVIEW. 
mastication, when chance again brings them within reach of the 
teeth. 
From the ventral side of the ample crop that precedes the 
stomach, there springs, in F. ornata, a perpendicular membrane 
or veil, extending partly across the cavity.* This is free, 
except at the vertical edge, by which it is attached to the side 
of the chamber ; and being ample, and of great delicacy, it con- 
tinually floats and waves from side to side. At the bottom of 
this veil, but on the dorsal side, are placed the jaws, consisting 
of a pah- of curved, unjointed, but free mallei, with a mem- 
branous process beneath each (fig. 1). 
A large Floscule, eagerly feeding under my observation, 
presents the following phenomena : — In the water there are 
numbers of the green Euglence of different species, such as 
E. rostrata and pyrum, and of the beautiful Ghlorogonium. These, 
roving near the expanded disk, are seen to be drawn into the 
funnel, though the long setae remain perfectly motionless. After 
being hurled to and fro in the funnel awhile, the gramdar mem- 
brane closes suddenly upon them, and in the same instant the 
Floscularia contracts itself forcibly, extending again imme- 
diately. 
The interior is now seen to be in active motion, no doubt 
masticating the Euglence, but the opacity does not permit the 
process to be distinctly discerned. In this specimen the upper 
half of the viscera was of a rich green, doubtless from feeding 
on these organisms ; the lower viscera were deep red-brown. 
While I held my watch in my hand five minutes, I watched 
just twenty animalcules engulphed, of various kinds, mostly 
small; these were accidental stragglers, scarcely any being 
visible at any one time in the field. It seems to be a successful 
preyer ; an animalcule coming within half the body’s length is 
sure to be involved, and once in, it rarely gets out. 
The Circulation and Eespiration. — No contractile bladder 
and no system of ciliated tags, such as I have described in the 
previous paper, have I ever been able to discover in this genus, 
nor has any other observer, so far as I am aware, except Dr. 
Leydig, who describes and figures a small bladder in F. cornuta.-f 
I have, however, seen traces of a very remarkable vascular 
system, which I have some reason to think exists in Stepha- 
noceros also, perhaps in connection with the tortuous threads, 
perhaps independent of them. This I will describe. 
* Dr. Dobie considers this waving veil, in Iris Floscularia cornuta, to be a 
slit in the diaphragm, fringed with vibratile cilia, the motion of which, as 
he thinks, gives rise to the peculiar serpentine movement always observed 
at this point. — (Ann. Nat. Hist., 1849.) 
t Sieb. and KolL Zeitsch. ; July, 1854. He assigns it, however, to the 
ventral side, which certainly is not where I should expect to find it, if 
present. 
