78 Scientific Proceedings, Royal Dublin Society. 
Anurza brevispina, var. Gosse. 
[The Rotifera, vol. ii. p. 124, Pl. XXIX. fig. 5.] 
Common. 
Habitat.—In stagnant ponds, Co. Waterford. 
Notholea thalassia, Gosse. 
[The Rotifera, vol. 11. p. 127, Pl. XXIX. fig. 2.] 
Said to be exclusively marine. I have found two specimens 
among the branchlets of Vaucheria in a small cattle pond, at one 
time exposed to tides from the river Suir. The water was per- 
fectly fresh, the pond being fed from a spring. They were fine 
healthy specimens. Their manners were deliberate, and they 
continually revolved upon their transverse axis, head backwards. 
It has also occurred from a mountain stream, but examples from 
tidal pools always displayed much greater robustness, and more 
vigour and rapidity of movement. 
Habitat.—A. cattle-pond, a tide-pool, Co. Waterford ; a stream, 
a tide-pool, Co. Wexford. 
| [Pl. VI. fig. 4. ] 
Three of these singular-looking creatures were attached to the 
body of a young Nats. ‘The head tapers to a sharp beak which 
was buried in the soft skin of the worm, upon whose juices they 
apparently feed. So wide a departure from the usual structure 
of the mouth of.a Rotifer raises a doubt whether they may be 
truly classed among the group to which in other respects they 
seem to bear close affinity. The body is white, smooth, gibbous in 
the middle, and, curving downwards, tapers at both extremities. 
A black brain or eye (?) is placed over the mouth of the stomach, 
which latter occupies almost the entire cavity of the body, and 
was filled with a light gray granulated substance. Below it, and 
close to the foot, is a large clear vesicle, probably the contractile 
vesicle. The foot, one large bulbose joint, bears two slightly 
decurved blade-like toes of moderate length. There is no trace of 
mastax or trophi. The creature was singularly stiff in movement, 
and the foot was evidently non-retractile. Not measured, but 
about the size of Notommata cyrtopus. 
Habitat.—A pond, Co. Wexford, August. 
