THE ROTIFERA OF THE SCOTTISH LOCHS. 187 
The jaws are exceptionally narrow, being only equalled by some of the pellet-makers, 
the shape being in those cases quite different. In this the outline of the jaw is nearly 
a perfect arc of a circle. 
Central setee were not observed on the discs. 
On such short acquaintance it is impossible to suggest the attnities within the genus. 
Though no eggs were seen, the absence of foetus places it in the oviparous, non-pellet- 
making section of Callidina, with C. plicata, ete. In appearance it has no close 
relationship with the other animals in the section. 
Hubits.—Free-swimming in company with Brachionus pala and Anurea valga. 
When swimming, the rostrum and antenna are kept fully extended, the rostrum 
projecting in front of the corona, concealing the upper lip. From the bread corona to 
the toes, the general form is that of an elongate cone, though there is a narrowing at 
the neck and expansion in the central segments. The foot is also kept fully extended, 
even to the toes, and trails behind like a tail. 
Under the cover-slip it continually tried to swim, but, having too little room, was 
often compelled to stop. It then wriggled on its side in an aimless fashion. The 
little foot was drawn into the somewhat heavy trunk and shot out again, curling about 
like a worm. It seemed to be unfamiliar with the use of the toes for creeping, and 
some time passed before it made attempts in that direction. Even when it got on its 
feet, the toes were never drawn into their sheath in the usual way, but kept extended 
to their full length. 
The animal made its appearance in considerable numbers in a pond which dries up 
in summer, within a week after the pond filled at the beginning of winter. The pond 
is only a foot or two in depth, but when the collection was made it was calm and clear, 
and the collection was taken without disturbing the bottom; so there seems little 
doubt that it is a true swimmer, if only in shallow waters, and its behaviour under the 
confinement of the cover-slip confirms this. 
Halitat.—In a pond which fills each winter, and dries in summer, at Nerston, 
East Kilbride. Fairly abundant on the day when it was detected, it has never been 
again found, though the pond has been examined in the same manner at regular 
intervals ever since. Fortunately, the original collection was sent to Mr Bryce, who 
found some of the animals, and confirmed my diagnosis in some particulars, while 
agreeing with me that it was distinct from any species previously seen. 
