64 Scientific Proceedings, Royal Dublin Society. 
Mastigocerea bicornis (Ehrenberg). 
[The Rotifera, vol. ii. p. 68, Pl. XX. fig. 5.] 
One example only occurred. ‘The toe was longer in proportion 
to the body than given in the figure of the Monograph, and ex- 
tremely flexible ; it was curled about like the lash of a whip. 
Habitat.—A. marsh drain, Co. Wexford. 
Mastigocerea bicristata (?%), Gosse. 
[The Rotifera, p. 35, Pl. XXXI. fig. 27, of the “ cnppleray sl 
[Pl. V. fig. 5.] 
If the outline of the above-named species is persistent in all 
details, I am hardly justified in supposing my species to be identical 
with it, as it differs in two prominent features, firstly, in the curve © 
of the toe, which is of greater length, and sweeps downward con- 
tinuous with the curve of the dorsal line, not recurved as in the 
figure given in the “Supplement” (there is also a slender substyle 
closely adpressed); and, 2ndly, in the termination of the double 
arine, which, instead of ending abruptly at the neck, sweep down 
along either side of the face, and from between them the ciliary 
dise is but slightly protruded. The tips of the trophi are not in- 
curved but produced into a long narrow pincer-like form. The 
general contour of the body approaches closely to that of IZ. cari- 
nata. 
Habitat—A. marsh drain exposed to high tides of the river 
Barrow, in which some examples attained to a considerable size : 
Co. Wexford. 
Mastigocerea brachydactyla, sp. nov. 
(Pl. VI. fig. 1.] 
Sp. Ch.—Body irregularly cone-shaped; head lumpish; toe 
style-like, short, straight, no substyles, no ridge. 
Allied to I. séylata, but broadest at-the head ; body an irregu- 
lar cone, puckered into constrictions, but not gibbous in the 
middle ; the toe straight and finely-pointed, only one-fourth the 
length of the body ; no substyles; gait wobbling. 
Habitat.—A. pond, Co. Wexford. 
