igiS. HuGGiNS. — Limnaeae of West Cork Alpine Lakes. I21 



really situated on the watershed of the district, the majority 

 of those I visited being within the 1,500 feet contour, 

 nevertheless there is a ridge across the plateau dividing 

 them into two systems. On the south-western side of the 



EZKENO HOOU KEAqH/'Wi, 

 850, 



3Ke:tch maf 



OF THC 



CAHA LAKCS, 



ridge Loughs " K," " L," and the main stream from Red 

 Trout Lough (w^hich lies in a hollow of the ridge itself) 

 drain into the big lake system towards Castletown on the 

 further side of Mount Glenlough. Lough " D," again in 

 the ridge itself, drains into Lough Nambrack, the stream 

 from the latter, joining the rivulet from Lough " E," 

 plunges over the cliff into Derreenadavodia and thence 

 drains into the Coomarkane valley. 



On the north-eastern side of the ridge the smaller stream 

 from the north end of Red Trout Lough drains into Lough 

 " J," which again drains into Lough " 1," the stream from 

 which joins that from Loughanillaun (which in its turn 

 drains Lough " G " and receives one of the two effluents 



