Guascotr—A List of some of the Rotifera of Ireland. 71 
Euchlanis triquetra, Ehrenberg. 
[The Rotifera, vol. i. p. 91, Pl. XXIII. fig. 4.] 
This splendid species is fairly frequent, the dorsal crest well 
developed ; the glass-like clearness of the lorica, and the creature’s 
gentle, quiet way give ample opportuuity to study the internal 
structure. ‘The muscular bands at the sides of the body, the lateral 
canals with their vibratile tags, and the digestive system, are all 
clearly visible. 
Habitat.—Ponds, drains and streams, Co. Wexford; a stream, 
Co. Waterford. 
Euehlanis deflexa, Gosse. 
[The Rotifera, vol. ii. p. 92, Pl. XXIV. fig. 1.] 
The formation of the head of this species, which is peculiar and 
differs much from its congeners, gives it a very definite character. 
But a few examples occurred. 
Habitat—Amongst alge in a stream; in a pond, Co. Wex- 
ford ; a stream, Co. Waterford. 
Euehlania pyriformis, Gosse.' 
[The Rotifera, vol. ii. p. 93, Pl. XXIII. fig. 2.] 
Very scarce. Of singular beauty, the lateral expansions of the 
lorica being remarkably thin and clear, and the bend of the upper 
flanges gives a further expression of their tenuity. 
Habitat.—A bog, a stream, Co. Wexford. 
Cathypna Tuna (Ehrenberg). 
[The Rotifera, vol. ii. p. 94, Pl. XXIV. fig. 4.] 
Common everywhere. 
Cathypna rusticula, Gosse. 
[The Rotifera, vol. 1. p. 95, Pl. XXIV. fig. 6.] 
IT have little hesitation in applying this name to the species in 
question, although the toes are much more slender and somewhat 
longer than given in the figure referred to. The narrow and 
simple frontal aperture is identical with it, as is also the shape of 
