¥ 



Hood — On the Rotifera of the County Mayo. 691 



M. poeeilops, Gosse. H. and G., Suppl., p. 49, pi. xxxi., 51, Very 



numerous in a tide-pool to the north of Westport harbour, 1889, 



'91. 

 M. producta^ Gosse. H. and G., Suppl., p. 49, pi. xxxi., 53. A few 



examples in the "Westport lagoon, 1891. 

 Cochleare turlo, Gosse. I found a few specimens of this curious un- 



symmetrical Kotifer in Castlehar lake in 1891. 



Pamily Ptekodinid^. 



Pterodina lidentata, Ternetz, Eotat. d. Umgeb. yon Basel, 1892, 

 p. 44, pi. iii., 23. 



(Plate XXII., fig. T.) 



I found numerous examples of this Eotifer, at that time un- 

 known to me, in Castlehar and Knappagh lakes, 1889, '91, '94, 

 and had recorded and figured it in my notes as P. hilernica, 

 new species, but on the appearance of Ternetz' s paper, I per- 

 ceived that his P. lidentata was identical with my species. Its 

 characteristic feature is the form of the lorica, which is un- 

 equally oblong ; the anterior half is narrower than the posterior, 

 which bulge out into an almost circidar curve. The species 

 is fui'ther peculiar in being furnished with two lateral knobs 

 on the posterior aspect of the shield-like lorica. The internal 

 organs are similar to those of P. patina and P. valvata. It is a 

 transparent and attractive Eotifer. 



P. patina, Ehrenb. This species was fairly abundant in the quarry- 

 pond and mill-dam, and in some of the lakes, near "Westport and 

 Castlebar, 1889, '91, '92. 



P. truncata, Gosse. I found a few examples of this rare species in a 

 bog-pool two miles from "Westport, among Sphagnum, the leaves 

 of which were studded thickly with Oecisles pilida, 1892. 



P. clypeata, Ehrenb. This seems to be a widely-distributed species, 

 as I fijid it in the east of Scotland, in the Clyde district in the 

 west, and fairly well represented on the west coast of Ireland. 

 Many examples occurred on the Westport lagoon, and in other 

 tide-pools of Clew Bay; Louisburgh, 1889, Westport, 1891, '92. 



P. valvata, Hudson. A number of examples occurred in the clear 

 water of a quarry -pond among Chara and Conferva, 1892, '94. 



Family Beachionid^. 

 BracMonus urceolaris, Ehrenb. Numerous in the bog-pools around 

 Westport, 1891, '94. 



