692 Proceedings of the Royal Irish Academy. 



B. rubens, ELrenb. The water in a cattle-pond near Westport was 

 swarming witli this species in 1894. 



B. mulleri, Ehrenb. I found a number of this handsome species in a 

 tide-pool at Louisburgh, August, 1889, and at Westport in 1891. 

 Of the two figures given by Hudson and Gosse, that on 

 pi. sxx., fig. 8, is certainly by far the better likeness. 



B. pala, Ehrenb. Mr. Hudson, in the Monograph, groups together 

 with this species, and as a variety of it, Ehrenberg's B. 

 ampliiceros, wliich is marked by the possession of four short 

 spines on the posterior region of the lorica. The type-form, 

 that is to say the variety destitute of these posterior spines, was 

 fairly numerous in the old quarry at Westport in 1891. 



B. angularis, Gosse. This pretty little species was found in con- 

 siderable abundance together with the preceding species. 



Noteus quadricornis, Ehrenb. A few examples of this rare species 

 occurred in a small lake on the Knappagh road, 1891, '92. 



Family Anuejeid^. 



Anur<Ba curvicornis, Ehrenb. This, the smallest species of the genus, 

 occurred plentifully in several marshes and bog-pools around 

 Westport, 1889, '91, '92, '94. 



A. hypelasma, Gosse. This small species was met with frequently in 

 similar localities to the last near Westport and Castlebar, 1891, 

 '94. A. tecta, Gosse, is, in my opinion, identical with A, 

 hypelasma. 



A. aculeata, Ehrenb. Frequent in ponds and marshes round Castlebar 

 and Westport, 1889, '91, '94. Mr. Gosse's variety hrevispina 

 was also abundant. In some bog-pools, 2 miles E. of Westport, 

 I found specimens showing much variation, some possessing the 

 two short posterior spines, others devoid of them, and many again 

 in which only one of the spines was present. 



A. cochlearis, Gosse. Plentiful in Castlebar Lake, 1891 ; in the mill- 

 dam and in various lakes near Westport, 1892, '94. 



A. sermlata, Ehrenb. I found a great quantity of this species in a 

 bog-pool near Westport in 1892. The water was of a dark port- 

 wine colour, and was full of Utricularia, whose leaves were 

 thickly covered with Melicerta conifera. 



A. hiremis, Ehrenb. H. and G., Supplement, p. 54, pi. xxxiv., 32. A 

 few examples of this rare species were present in a tide-pool a 



