460 DR. MOXON ON THE ANATOMY OF ROTATORIA. 
or whether the tube opens, and one side of its orifice is produced and expanded into the 
triangle, so that the latter is a single plane, I cannot make out; but I believe the cilia 
must be on two opposed surfaces; and it is to be remarked that an identical appearance 
of flickering cilia is produced by the same conditions in the tube-valve of the crop of 
Floscularia, described before in this paper, as also by the cilium-lined tubular cesophagus 
of Metopidia and many other Rotifers, which often wear the appearance of flickering 
cords. Any one making this observation will be quite sure that the tags or vibratile 
funnels are, as in Annelida, lined with short vibratile cilia, and that the long flickering 
cilium, which in some positions seems so surely present, is but an optical illusion, which 
arises when the observer looks along the level of the ciliated surface. 
The position of direct observation should exclude argument; yet it is only fair to ask, 
in what manner a flabellum in a blind bag could produce a current? Again, cilia do not 
move in the flickering way here attributed to the imaginary single cilium; they have 
a lashing movement, upon their root as a centre of rotation: the flabella of certain 
Monads which wave about in an irregular serpentine way never look in the slightest 
degree like the candle-flame appearance in question ; whereas it is very closely resembled 
by the narrow cesophagus of Metopidia, &c., and by the tube-valve of Floscularia, where 
we certainly have short cilia within a tube. 
Lastly, the close analogy between these ciliated appendages and. the open vibratile 
funnels on the water-vessels of Naids and their allies tends powerfully to support this 
conclusion. (Fig. 8 £& represents one of the funnels of Nais, sp.) In these animals the 
cilia of the funnels not only line the interior of the appendages but extend over their 
border, and may be seen playing in the fluid, and agitating the corpuscles, of the peri- 
visceral cavity. 
EXPLANATION OF THE PLATE. 
PLATE XLVII. 
Fig. 1. Floscularia, adult.—The reproductive system and the granules in the perivisceral cavity are not 
represented. 
Fig. 1*. The same, a three-parts-grown specimen, with the oral and pharyngeal cavities and the tube- 
valve everted: o, the verge of the mouth ; €, the faucal sphincter. 
Fig. 1^. The same, three hours after hatching. 
Fig. 2. Melicerta ringens. 
Fig. 2*. The same, emerging from its cell, showing its three feelers. 
Fig. 3. Head of Limnias Ceratophylli, seen obliquel i 
> fr eit: 
Fig. 4. Head of Philodina. ae obliquely from below on its left on aspect 
Fig. 4^. Egg of Philodina: k k of 
^ : water-vascul : 
Fig. 5. Pterodina, Pe gie 
