26 THE ROTIFERA. 
a rather thick ribbon, slack, but scarcely convolute, passes down each side, apparently 
lost in (perhaps beneath) the lateral brain-sac, bearing sundry vibratile tags, and merging 
into a small contractile vesicle. The alimentary canal and the ovary were both amply 
sacculate in such specimens as I have examined. 
I first met with this fine species on the dichotomous leaves of the Water Crowfoot, 
growing in a sunken pan in my own garden near London, in the summer of 1849. It 
was vigorous and active, swimming rapidly through the water, with a headlong, pushing 
violence, or fixing itself slightly by its toes, and thrusting about its head in all directions. 
It seemed fierce and voracious; for, though I did not actually see it swallow food, it 
several times munched with apparent greediness the side of a large Rotifer, returning 
to the attack, and seeming to bite ferociously. The Rotifer, if not materially injured, 
was thoroughly alarmed. I have since met with the species, but very rarely.—P.H.G.] 
Length, .', inch. Habitat. Near London (P.H.G.); Sandhurst, Berks (Dr. Collins). 
N. tupa, Hhrenberg. 
(Pl. XVIL. fig. 8.) 
Notommata tuba . 6 é 5 Ehrenberg, Die Infus. 1838, p. 433, Taf. xlix. fig. 3. 
[SP. CH. Body trumpet-shaped; brain clear; a cervical eye ; toes furcate, conical, 
minute. 
My right to mention this species rests on a pencil-sketch which I made from life, 
many years ago, and which I still possess, but without sufficient detail to warrant de- 
scription, and of which I have preserved no accompanying notes. In Dr. Collins’s Note- 
book, which is kindly entrusted to me, there is a pencil-drawing to which he has 
attached this name; but this also is unaccompanied by any note, except the date 1866. 
From Ehrenberg’s figs. I conjecture that its affinities are with Hydatina, the 
cervical eye notwithstanding.—P.H.G.] 
N. bactnubata, Lhrenberg. 
(Pl. XVIL. fig. 9.) 
Votommata lacinulata . 5 c Ehrenberg, Die Infus. p. 428, Taf. li. fig. 4. 
[SP. CH. Small; body cylindrical, thick, broadly truncate; brain clear; foot 
short; toes long; trophi forcipate; incus much developed, hemispheric; mallei very 
small. 
This tiny, sprightly atom is of pleasing form; vertically viewed, it is a very regular 
oval in outline, the head dilated, archedly truncate, and of a width, when the hemi- 
spheric auricles are out, equal to that of the body; while at the other end the acute 
divergent toes, set on a very short foot, make an elegant finish to the form. Laterally 
viewed, the diameter is nearly the same, the fore and hind extremities nearly perpen- 
dicular and nearly equal, the dorsal line arched, the ventral straight, the foot and toes 
set-on at the end of the latter. 
The mastax is very large and the trophi peculiar. The incus is remarkably developed, 
the fulcrum stout and long, the rami forming, when closed, a transparent hemisphere, 
‘‘ so as to resemble, when viewed obliquely from above, a globe of glass standing on a 
pedestal.” (See my mem. “On Mandue. Org.” in “ Phil. Trans.” 1855, p. 482, pl. xvi. 
figs. 82-84.) The tips of the rami are habitually projected in greater or less degree 
from the front, so that there is no buccal funnel proper. Behind the mastax there is 
a large dilated pale-red eye, seated near the middle of a moderate brain, which carries 
no opaque chalk-granules.!_ The alimentary canal is ample, usually filled with food of a 
rich yellow-brown hue, which adds much to the attractiveness of the animal. 
1 Eckstein finds his usual two red specks at the ciliate front, in addition to the large red eye at 
the bottom of the brain; but he does not associate them here with tentacular seta. 
