DAP, A NEW ROTIFER. 
hollowed on the ventral side, the hollow deepening towards the posterior 
end, where the female carries the egg attached. 
Tt has one round red eye, centrally situate, level with the base of the 
long frontal spine, and viewed from the ventral side the mastax is seen 
a little to the left, working away in the usual manner, having I believe 
four pairs of teeth upon which its prey is continually falling. 
Curiously enough in the first specimens gathered the eye-spots were 
two, nearly close together, both round and red, and of equal size; 
but in those since taken, evidently in a more advanced stage, 
many of them carrying the egg, one eye only appears, much larger, but 
in other respects the same. This phenomenon is new to me in Rotifer 
life, and I have carefully preserved mounted specimens showing both 
characteristics. It is common enough in some species for the eyes to 
disappear altogether; but this is the first instance I have met with in 
which two small spots, apparently, coalesce and form one larger eye. 
The trochal lobes, as shown in the sketch, commencing with the two 
central short horns, are more protruded than is usual when the 
creature is swimming, the specimen figured being held under slight 
pressure ; they are furnished with six small tufts of cilia, which under a 
low power appear almost continuous, and are protected by four short 
horns, which, unlike the long spines, will bend inwards. 
The capacious stomach is of very simple form, looking like a long 
sack. It occupies about one-half the enclosed space, starting from the 
gizzard, passing down the left side, and forming a constriction towards the 
end, and in the specimen now under examination a rhythmical expansion 
and contraction is continuously taking place. 
Professor Kellicott figures a pair of well-defined ‘‘ wheels” which 
are not to be seen in my Rotifers, and are probably a mistake. 
Like its congeners, it is heavily weighted with its case, and its power 
of propulsion is comparatively slight. Itswims either forwards or back- 
wards at about the same speed, and appears to prefer deep water for its 
habitat, being most abundant from three to five feet below the surface, in 
apart of the pool free from plants or mud; it lives but a short time after 
being gathered. 
Its companions at Olton were two other forms of Anurea, viz., 
A. aculeata and A. stipitata, with several species of Peridiniga, either 
with or without horns, the form I have sketched at Fig. 2 being the most 
abundant. This bizarre-looking creature, about 1-100th of an inch in extreme 
length, (possibly the Ceratium longicorne of Perty,) is new to me in fresh- 
water life, the horned species of Peridinium being usually found only in 
salt water; it belongs to that order of ciliated organisms which are 
besides furnished with one or more flagella, and therefore named cilio- 
flagellata. 
Its congeners are well-known among the marine forms of phos- 
phorescent protozoa, and its outline will be recognised as not unlike some 
of the species found at Arran last year, when the microscopists of the 
Marine Excursion party were busy seeking Noctiluca. It is ofa yellowish 
green colour, has a rough and apparently calcareous carapace, which is 
