Guascorr—A List of some of the Rotifera of Ireland. 73 
Monostyla quadridentata, Ehrenberg. 
[The Rotifera, vol. ii. p. 100, Pl. XXYV. fig. 3.] 
The longitudinal striations of the lorica, and its unusual 
flexibility, together with the V-shaped gape of the frontal 
margin, denote the species. JI have seen it twice. In the first 
example, which was dead, the horns were not visible; in the 
second, they were partially protruded and analy withdrawn while 
- under observation. 
Habitat.—Among Wyriophyllum in a bog, Co. Wexford. 
Colurus deflexus, Ehrenberg. 
[The Rotifera, vol. ii. p. 102, Pl. XX VI. fig. 1.] 
Several examples of this rare species occurred in bogs and 
ditches, and in one locality, a deep drain of a marsh by the sea- 
side, it was quite frequent. The rounded excavation behind, the 
much greater plumpness of the body, and its shaded yellow tint 
form considerable differences between it and C. deflegus ; the 
ventral cleft seemed always to terminate upon the breast. Its 
manners were slow and heavy, exactly the reverse of its ea 
relative. 
Habitat.—Ponds and ditches, Co. Wexford; a marsh drain 
Tramore, Co. Waterford; among the stems of Vaucheria, Co. 
Carlow. 
Colurus obtusus, Gosse. 
[The Rotifera, vol. ii. p. 108, Pl. XXVL. fig. 3.] 
Fairly common. 
Habitat.—Ponds a streams, Cos. Waterford, Wexford, and 
Carlow. 
Colurus caudatus, Ehrenberg. 
[The Rotifera, vol. i. p. 104, Pl. XXVI. fig. 6.] 
Hasily recognized by the long toes, which are frequently thrown 
apart. Not uncommon. 
Habitat.—Ponds, bogs, and streams, Cos. Waterford, Wexford, 
and Kerry. 
