Guascorr—A List of some of the Rotifera of Ireland. 7d 
Metopidia oxysternum, Gosse. 
[The Rotifera, vol. i. p. 107, Pl. XXV. fig. 8. ] 
The dorsal ridge was much higher than in the figure quoted 
above, but the sternum was not prominent; very rare, only one 
example occurred. 
Habitat.—A stream, Co. Waterford; a pond, Co. Wexford. 
Metopidia triptera, Ehrenberg. 
[The Rotifera, vol. 11. p. 108, Pl. XXV. fig. 7.] 
This very interesting form is said to be rare. I have found 
it frequently in all fresh waters. 
| Habitat.—Ponds, bogs, and streams, Cos. Kerry, Waterford, 
Wexford. 
Metopidia bractea (Ehrenberg). 
[The Rotifera, vol. i. p. 109]. 
The largest of the genus. Very common. I have never seen 
the eyes. 
Habitat.—In all fresh waters. 
Metopidia ovalis (?), Ehrenberg. 
[The Rotifera, Pl. XXXIV. fig. 2, of “ Supplement.” | 
This not uncommon species answers very closely to HKhrenberg’s 
figure and description referred to above. It has occurred in several 
localities. ‘The depressed and oval shape of the lorica, narrowed 
in front, the dorsal plate truncate at both ends, its margin not 
excised, are identical, but the frontal excision of the ventral plate 
is deeply crescent-shaped, not square. The excision behind for the 
protrusion of the foot is square, not round. ‘The hood is very 
prominent. 
Habitat.—Ponds and pools, Co. Wexford. 
Monura colurus, Ehrenberg. 
[The Rotifera, vol. ii. p. 109, Pl. XX VI. fig. 7. ] 
This species is said to be exclusively marine, but I have found 
it twice in fresh water, among confervoid growth, on an old leaf 
which had lain in a well; the outstretched hook, the unusual 
