76 Scientific Proceedings, Royal Dublin Society. 
length of the body from head to foot, the rounded ends of the 
lorica, both behind and before, and the long, single, style-like toe 
correspond exactly with the figure above mentioned. 
Habitat.—A well, tide-pools, Co. Wexford; a small pond, 
formerly exposed to the tide, Blenheim, Co. Waterford. 
Cochleare turbo, Gosse. 
[The Rotifera, vol. ii. p. 111, Pl. XXVI. fig. 10.] 
This was evidently avery well grown specimen, the body much 
more plump and rounded than in the figure referred to, especially 
over the dorsalarea. I did not perceive it to be “‘ three-sided ”’ but 
rather of an interrupted rounded outline somewhat flattened on the 
ventral side. ‘There were two conspicuous globose gastric glands 
seated near the mouth of the stomach, a large ovary beneath it; 
the red eye was placed upon the lower end of a semi-globose brain, 
The face was oblique and just as described in the Monograph, the 
two lower half-cones being considerably protruded, which produced | 
a chin-like appearance. The toes were occasionally divided, but 
more usually pressed together, and upon their points the creature 
balanced itself as upon a pivot, and swung about in an aimless 
manner. 
Habitat.—A marsh drain, Co. Wexford. 
Pterodina patina, Ehrenberg. 
[The Rotifera, vol. ii. p. 112, Pl. XXVI. fig. 11.] 
Frequent. The borders of the dorsal plate widely stippled. 
Habitat.—Ponds, Cos. Waterford and Wexford. 
Pterodina valvata, Hudson. 
[The Rotifera, vol. ii. p. 118, Pl. XXVI. fig. 13.] 
Rather scarce. Lorica so thin as to be hardly perceptible. 
Habitat.—Ponds, Co. Wexford. 
Pterodina clypeata, Ehrenberg. 
[The Rotifera, vol. ii. p. 114, Pl. XXVI. fig. 14.] 
This species, agreeing closely with the figure given in the Ro- 
tifera, is somewhat broader, and not so distinctly truncate behind ; 
