38 Scientific Proceedings, Royal Dublin Society. 
Rotifer phaleratus,’ sp. nov. 
(Pl. III. fig. 1.] 
Sp. Ch.—Body translucent, tapering gradually from the shoul- 
ders, which are broad, and ornamented with a conspicuous pear- 
shaped marking. 
This species is probably only a variety of R. vulgaris, which 
it resembles in most particulars, but it is much broader at the . 
shoulders (or that part of the body immediately behind the neck), 
which are ornamented with a broad, dark, pear-shaped marking, 
apparently confined to the outer integument, as it shows no change 
of position during the movements of the internal organs. As I 
was obliged to sketch in the head from memory, the details of 
that part are not reliable. Three of these creatures occurred from 
the same dip. 
Habitat.—A stream, Co. Wexford. 
Callidina elegans, Ehrenberg. 
[The Rotifera, vol. i. p. 109. ] 
The hooked proboscis on the tip of the column—a distinctive 
feature in the species—was not minute, as described in “The 
Rotifera,” but quite prominent. ‘The body was large and heavy, 
the central segment greatly swollen, and marked out by deep con- 
strictions. It was of a dirty white colour; its manners were 
sluggish, crawling slowly and heavily amongst the rubbish, in 
which it sought to conceal itself. There were, of course, no eyes— 
about the most inelegant species I have met with. 
Habitat.—A. pond, Co. Waterford. 
Callidina bidens, Gosse. 
[The Rotifera, vol. i. p. 109, Pl. X. fig. 8.] 
At my first introduction to this species it was boldly walking 
across an open space with regular stride, using foot and mouth as does 
the larva of a Geometra. As soon as it approached a neighbouring 
cover, however, it was glad enough to take refuge therein, and 
withdrawing the foot sat comfortably down on a broad base, 
1 Phaleratus, ‘‘ with ornaments on the shoulder.” 
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