18 THE ROTIFERA. 
T. SAUNDERSI®, Gosse, sp. noy. 
(Pl. XVII. fig. 11.) 
Taphrocampa Saundersia . 5 Hudson, J. Roy. Micr. Soc. 2 Ser. vol. vy. 1885, p. 614, pl. xii. 
[SP. CH. Body lengthened, fusiform, annulate; brain clear; a decurved frontal 
hood ; two eyes (?) ; a distinct tail; foot and furcate toes of normal form. 
Many examples of this form occurred to my observation in the floccose sediment of 
water, very rich in Rotiferous life, which was sent me by Miss Saunders of Cheltenham, 
in May 1885, dipped from a tank which she had used as a preserve of living Rotifera. 
But Dr. Hudson had observed the same species in water from Birmingham, in July 
1884 ; and had prepared a notice of it for the ‘‘ Journ. Roy. Mic. Soc.’ The publication 
was delayed, however, through press of matter, till the following spring. It is a very 
distinct species, less abnormal than 7’. annwlosa, more manifestly Notommatous in its 
affinities. 
The body is divided into well-marked rings, about seven or eight, not so numerous 
as in annulosa; each of which rises to what seems a sharp edge; but momentary 
glimpses, which one has as it turns around the weeds, show a number (not only four) of 
conical points (perhaps about eight in the dorsal half) im the transverse section (as at 
fig. 11b), the expression of as many series of conical elevations running down the whole 
(possibly dorsal and lateral) surface. The head is rather large, and sub-globose (fig. 11), 
and seems permanent in outline ; as the restless animal twists and turns itself about con- 
stantly, causing much change of diameter, the head remaining undiminished, the neck 
(so to speak) becomes conspicuously slender, to be filled up by the next contraction, 
an instant. Very frequent retractation of the hind parts towards the head occurs. There 
is a marked diminution in these parts, the ultimate segment bearing two moderately 
short diverging toes; the penult or antepenult segment sending forth a distinct conical 
projection, which follows the general direction of the body, and may be called a tail, 
with more breadth than depth, much as in Notomm. tripus, N. pilarius, and others 
(fig. 1la). The front of the head bears a projection, which, on a lateral view (fig. 11a), 
looks like a proboscis, and often like a sharp hook, bent forward and downward; yet I 
think it has considerable width, and Dr. Hudson has found it to be a broad arched 
hood. Just behind this organ, and so on the very front of the globose head, are a 
pair of minute colourless globules, quite conspicuous in all aspects, which may be 
eye-spots. The mastax consists of two stout, curved, pointed teeth, capable of being 
widely expanded and closed, like the blades of scissors (fig. 11); these appear based on 
an oblong transparent body, probably the muscular bulb requisite for motion. The 
points can be brought to the edge of the front.! The front is oblique; it is composed 
of several fleshy eminences, each bearing a crown of cilia, whose vibrations I have 
distinctly seen, though they do not appear to constitute a disk or rota. The animal’s 
motion in the free water, a smooth and rather swift gliding, is doubtless produced by 
these frontal cilia. Accurate observation, with the high powers required by its minute- 
ness, is very difficult from its incessant restlessness; as it glides through the open, it 
is constantly contracting and extending the body; at the nearest atom of sediment it 
pauses, but instantly throws itself into rapid contortions. A long stomach, capable of 
much width where it proceeds from the mastax, reaches to the cloaca under the tail, 
while a large ovary occupies the ventral region. The body is transparent, more or 
less tinged with yellow. The stomach usually contains particles of dark food, sufficient 
sometimes to impart a blackish hue to the body; while the entire venter may be filled 
with a dark ege. 
I have honoured this species with the name of Miss Saunders of Cheltenham—from 
1 These seem to be the blades of an ineus (of the pattern Fig. 21 of my memoir in Phil. Trans. 
1856, pl. xvi.); the mallei apparently quite aborted, 
