52 Scientific Proceedings, Royal Dublin Society. 
petromyzon in the position of the coronal disc, which was quite 
prone, and in the shape of the trophi and the foot; but the head 
was more distinctly marked out; the body flask-shaped, being 
broadest at its lower end; the upper portion of the broad stout 
foot (?) was entirely filled with a large clear contractile vesicle, the 
foot glands appearing below it. A large, deep crimson eye rested 
upon the top of the mastax; no further details were recognisable. 
Length about half that of the above-mentioned species. 
Habitat.—A. bog, Co. Wexford. 
Fureularia forficula, Ehrenberg. 
|The Rotifera, vol. u. p. 41, Pl. XX, fig. 1.] 
Both the ordinary and stouter variety of this, species are not 
uncommon, the latter being the more rare ; their favourite hunting- 
ground appears to be the forsaken tubes of small aquatic larve, 
up and down which they vigorously forage for food. I have seen 
two or three together positively racing against each other, and the 
rapidity with which they turned at the end of the tube was amazing. 
No doubt these are the mysterious tubes alluded to by Dr. Hudson, 
of which dozens occur amongst filamentous debris and floccose 
sediment. In one instance the original occupant was at home, 
and popping out the little brown head, seized a new species of 
Rotiferon, which I was endeavouring to sketch, and coolly devoured 
it wholesale before my eyes, leaving me aghast, pencil in hand! 
En passant, I have sometimes met with one of these tubes, which 
is an exceedingly pretty object, being woven out of a blue-green 
species of Oscillatoria, which hung in a long thick fringe from the 
sides, a deeper shade of colour marking the course of the tube. 
Habitat.—Streams and ponds, Cos. Waterford and Wexford ; 
the Canal, Dublin. 
Furcularia gracilis, Ehrenberg. 
[The Rotifera, vol. ii. p. 42, Pl. XIX. fig. 14.4.] 
The bulging prominence of the ventral surface towards the 
foot distinguishes this species from F. ceca, which it closely re- 
sembles in size and shape. 
Habitat.—A. stream, Co.Wexford. 
