690 Proceedings of the Royal Irish Academy. 



Metopidia lepadella. Ehrenb. Frequent in marslies and lakes near 

 "Westport and Castlebar. 



M. solidiis, Gosse. A. few examples only in the mill-pond at "West- 

 port, 1894. 



M. oxystermim, Gosse. I found this pretty species prolific among 

 aquatic weeds in Castlebar Lake in 1891, and in two small lakes 

 near Westport during the same summer. Apparently it was 

 quite extinct on my later visits, as I found none after that date. 



M. triptera, Ehrenb. This species was frequently met with in 

 vegetable debris from lakes and marsh-pools around Westport, 

 1889, '92, '94. 



M. ovalis, Ehrenb. H. & G., Suppl., p. 48, pi. xxxiv., 2. This 

 handsome little species was frequent in the old quarry at West- 

 port, and in bogs near Westport and Castlebar, 1891, '94. 



M. cornuta, Schmarda. H. and G., Suppl., p. 47, pi. xxxiv., 3. 

 I met with five examples only in a pool in Westport Harbour, 

 1892, filled at spring tides once or twice each month ; the water 

 was rendered brackish with rain during the intervals. This 

 species is conspicuous owing to the presence of two curved spines 

 on the dorsal frontal edge of the lorica. 



M. pygmcea, Gosse. H. and G., Suppl., p. 46, pi. xxxi., 47. This 

 species was frequently met with in bog-pools, among aquatic 

 weeds, near Castlebar, 1891, and near Westport, 1892, This is 

 another of the species sent some years ago by my son to Mr. 

 Gosse, from county Leitrim, 



Monura colurus, Ehrenb. Erequent in the Westport lagoon, 1889, 

 '91, '94. 



M. loncheres, Gosse. H. and G., Suppl., p. 48, pi. xxxi., 50. I met 

 with this sprightly little Rotifer abundantly among Ulvse and 

 Confervse scraped from the wall of Westport quay. It occurs in 

 similar situations in the estuary of the Tay, and is one of the 

 first marine llotifers that I met with there. 



Mytilia tavina, Gosse. This species is another of my finds near 

 Dundee, and was named by Mr. Gosse after our Scottish river. 

 It was numerous in the Westport lagoon, in 1889, '91. 



M. teresa, Gosse. H. and G., Suppl., p. 49, pi. xxx;i., 52. Numerous 

 in a tide-pool in Clew Bay, near Westport harbour. 



