40 REV. J. E. HULL ON 



79. Bdella norvegica, S, Thor. 67. 



West Allendale. The few examples I have taken 

 occurred under stones. 



80. Bdella littoralis, L. 66, 67, 68. 



A large species distinguished by the long setae (1?.^. 

 on the dorsal face of the mandibles and abdomen) 

 in general, but comparatively short apical setae of 

 the palp, which are about the same length as the 

 setae on article ii. 



Not reported for Ireland ; otherwise it seems pretty 

 general on British coasts. 



81. Bdella capillata, Kr. 67, 68. 



Local specimens and those taken by me on the Dee 

 estuary hardly appear to be anything more than a 

 variety of ////<?rrt'//i'. The distinctive characters of 

 Kramer's species seem to be three apical setae on 

 the palp, and not more than 11 or 12 setae'''' on the 

 dorsal face of the mandibles. So far as I can make 

 out only Halbert's Irish specimens conform to these 

 conditions, other authors seem to have had more 

 than one form before them. 



Flintshire, Ireland. 



82. Bdella lacustris, Hull, 66, 67, 68. 



An abundant species in the north of England, equally 

 at home on stony shores of lakes and among 

 grass, rushes, &c., on the moors, as well as in the 

 plains. This and the next have the dorsal setae 

 of the abdomen transformed into short stout acute 

 spines. The setae on the mandible number 20 or 

 more. 



■* Eleven in Kramer's figure. According to Dr. Thor, the corresponding 

 setae in littoralis range from 8 to 15 (it is 10 to 13 in my specimens). No 

 other known species sa\e capillata conforms to tliese limits. 



