OF THE ENGLISH LAKE DISTRICT. 
425 
Dlaee. Several species of Cyclops were taken, of vvbicli the most interesting 
is C. vennstus, which was common in pools on Floutern Pass and was also 
found by Grreendale Tarn. It was somewhat unexpected to find C. nanus in 
pools on Floutern Pass since I regard this species as a warm-water form. 
It is worth noticing tliat Acantlioleheris curvirostris was only found in two 
high-lying pools. This is a species found in lime-free bog waters, but it is 
evidently not a cold-waier northern form. Alona rustica and Chydorus piger 
are species of similar preference, and were found rather infrequently on the 
high ground. 
Table 5. — The Crustacea of the Tarns. 
Diaphanosoma bvaihyurmn 
Ceriodaphnia pulchella 
Bosmina longirostris . . ,', 
„ obtusirostris .... 
Eurycercus Imnellatus . . . . 
Aci-operiis harpce 
Alonopsis elongata 
Alona affinis 
Alonella nana 
„ excisa 
GrajJtoleberis testudinaria 
Polyphemus pediculus . . . . 
Cyclops leucJcarti 
„ agilis . . 
„ viridis 
„ fuscus 
Duiptomns yracilis 
,, laticeps 
Canthucamptus zschokliei 
?-I 
'si 
1^ 
+ 
+ 
+ 
+ 
+ 
+ 
+ 
+ 
+ 
+ 
Highlow Tarn has all the characters of a lowland pool, but the remaining 
tarns described are f)robably fairly representative of all the high-lying waters 
of the district. Those examined fall into two groups, of the peaty and the 
rocky type, the former represented by Floutern and Greendale Tarns and 
the latter by Levers Water, Low Water, and Goats Water. Floutern and 
Greendale Tarns have a relatively rich Entomostracan fauna characterized 
LINN. JOURN. — ZOOLOGY, VOL. XXXV. 31 
