Hood — On the Rotifera of the County Mayo. 683 



numerous was it, that a single dip of the dipping-tube brought 

 up about a hundred individuals. 



Eosphora elongata, Ehrenb., = Furcidaria najas, Duj., = Notommata 

 ehngata, Bartsch. Cf. Eckstein, Eotat. der TJmgegend von 

 Giessen, Z. f. w. Z., xxxix., p. 358, fig. 30, 1883 ; H. and G., 

 Suppl. p. 27, pi. xxxiii., fig. 9. 



(Plate XXI., fig. 3— 3d.) 

 I found a few examples of this large species in a small lake 

 on the Knappagh Eoad, two miles from Westport, on several 

 occasions during July, 1894. This is the first record of its 

 occurrence in Britain. Specific Characters. — Body elongated, 

 fusiform; corona truncate, with two styles on the dorsal edge; 

 vibratile cilia long. Eyes three in number, two in front, one in 

 the neck on the middle lobe of the brain. Brain of three lobes. 

 Antennae, three — one in front on the dorsal side, two dorso- 

 lateral antennae in the lumbar region. Cloacal vent immediately 

 above the foot. Eoot, one-jointed, with two short toes. Lateral 

 tubes and vibratile tags well defined, running from the neck 

 to a small contractile vesicle above the foot. Ovary a large 

 oval sac. Length, -gV inch. I am indebted to Mr. T^uttall for 

 the accompanying drawings which give a perfect likeness of 

 the animal ; they are taken from specimens sent him by me 

 from Westport. 



E. digitata, Ehrenb. H. and Gr., Suppl., p. 27, pi. xxxiii., fig. 10. 

 This species is not half the length of JE. elongata; the body is 

 more conical, and the toes are long. I found two examples 

 only in sediment from the neighbourhood of Xnappagh Lake, 

 1894. 



Sub-Order — Loeicata. 

 Family Eattulide. 



Mastigocerca elongata, Gosse. JSTumerous in the lakes and bog-pools 

 near Castlebar and Westport, 1889, '91, '92. 



M. rattus, Ehrenb. I found a few specimens in the old quarry-pool 

 at Westportin 1892, '94. 



M. iicornis, Ehrenb. Fairly abundant in a small lake in the Knap- 



