678 Proceedings of the Royal Irish Academy. 



Pamily Notommatidje. 



Alhertia intrusor, Gosse. I met with a few isolated examples of 

 this parasitic species, while examining sediment from two of 

 the small Knappagh lakes, in 1891, '92. 



Taphrocampa annulosa, Gosse- Frequently met with in vegetable- 

 debris from the Knappagh lakes : 1891, '92, '94. 



T. Saundersice, Gosse. Frequent in similar situations to the last, near 



Westport or Castlebar, 1891. 

 Phurotrocha leptura, Ehrenb. Four examples in Castlebar lake, 1891, 



and a few from the neighbourhood of Westport, 1892. 

 Notommata tripus, Ehrenb. Several examples of this very sluggish 



species were found in a bog-pool amongst Sphagnum, at 



Castlebar, in 1889; more frequent near Westport, in 1892, '94. 

 N. cyrtopus, Gosse. Several examples in a bog-pool, 2 miles S. of 



Westport, 1892. The same pool was full of Chara, thickly 



studded with Melicerta eonifera. 

 W. pilarius, Gosse. I met with many specimens in the bog-pools 



round Castlebar and "Westport. 



iV. forcipafa, Ehrenb. Eight specimens only, in vegetable debris 



from a mill-dam, "Westport. 

 iV. Umax, Gosse. H. and G., Supplement, p. 20, pi. xxxi., 8. A 



number of specimens among Chara and Utricularia in a bog-pool 



near Westport. Mr. Gosse records it from material sent him from 



Carrick-on-Shannon by my son. 



iV. hrachyota, Ehrenb. This form is widely distributed. Examples 

 were to be found in the water, and the vegetable dehris from 

 most of the bog-pools near Westport and Castlebar. 



N. saccigera, Ehrenb. Fairly numerous in the sediment of the lakes 

 and pools in the Knappagh district, 1891, '92. 



N. ovulum, Gosse. H. and G., Supplement, p. 20, pi. xxxi., 7. 

 Four specimens only, in a marsh near "Westport, August 1, 1894. 



N. potamius, Gosse. H. and G., Supplement, p. 21, pi. xxxi., 9. 

 This symmetrical and well-marked species occurred in a bog-pool 

 near Westport, in June, 1891. 



N. lacinulata, Ehrenb. This is the most sprightly and vigorous 

 species of the genus. In one or two small lakes many examples 

 occurred among Myriophyllum and other weeds, especially whea 

 these were intertwined with confervoid filaments. 



