Griascotr—A List of some of the Rotifera of Ireland. 65 
Rattulus tigris, Miller. 
[The Rotifera, vol. ii. p. 65, Pl. XX. fig. 13.] 
A rare species. One fine example only occurred among the 
leaflets of Utricularia. 
Habitat.—A. marsh drain, Co. Wexford. 
Rattulus helminthodes, Gosse. 
[The Rotifera, vol. u. p. 65, Pl. XX. fig. 17.] 
Not frequent. In the few specimens which occurred the head 
was always of the same width as the body, but possibly in death 
there would be a slight contraction, more nearly approaching the 
figure in “ The Rotifera.” 
Habitat.—A marsh drain, Co. Wexford. 
Rattulus cimolius, Gosse. 
[The Rotifera, vol. ii. p. 66, Pl. XX. fig. 14.] 
One solitary example from a pond. The dark sacculated brain 
reached almost to the centre of the body. The auricles were 
occasionally thrust out. 
Habitat.— A. pond, Co. Wexford. 
Celopus porcellus, Gosse. 
[The Rotifera, vol. ii. p. 67, Pl. XX. fig. 18. ] 
This is a very common species, and occurs in both still 
and running waters amongst various aquatic plants and alge. 
The absence of styles at the base of the toes and the plump 
rounded outline of the body render it easy of recognition. 
Habitat.—Ponds and streams in the Cos. Waterford and 
Wexford. 
Celopus tenuior, Gosse. 
[The Rotifera, vol. ii. p. 68, Pl. XX. fig. 19.] 
By no means frequent. A few examples occurred. 
Habitat.—A. bog and a marsh drain, Co.Wexford ; one amongst 
bog-moss from Oo. Kerry. , 
SCIEN. PROC. R.D.S., VOL. VIII., PART I. F 
