316 The Entomostraca of Mid-Lothian. [Sess. 
The three ponds in Penicuik grounds—the High Pond, 
Low Pond, and Hurley Cove—are all good places. The High 
Pond is our only locality for a certain Ceriodaphnia, whether 
C. rotunda, Strauss, or OC. scitula, Herrick, we have not yet been 
able to determine. It is also the only pond in Mid-Lothian 
where we found Peracantha truncata. 
In Hurley Cove we have found great numbers of Daphnia 
lacustris. We obtained specimens of this species on 1st 
December 1900, but on visiting the pond on 16th March 
1901, we found none. This species also occurs in large 
quantities in Granton Reservoir (where we have also found 
Volvoz). 
The Marlpit, Davidson’s Mains, is another good fishing- 
ground: from it may almost always be obtained Cyclops 
phaleratus, which is by some writers considered a rare species ; 
we have come across it in five localities. 
As an example of an unexpected find in a frequently 
examined pond, we may mention Plewroxus trigonellus, of which 
we found several specimens last June in our very small pond 
at Marchfield. 
Marfield Loch is one of the most interesting pieces of 
water that we have visited. It is presumably of great age, 
and has quite an unusual fauna, since of the fifteen species we 
obtained from it, four (Diaphanosoma brachyurum, Acantho- 
leberis curvirostris, Alonella exigua, and Alonopsis elongata) we 
found nowhere else, and four more in only one other locality. 
The character of the surrounding country has no doubt much 
to do with this; we have observed a somewhat similar fauna 
in ponds in the Trossachs, and the English Lake District, where 
there is the same mossy, swampy kind of ground. 
The old quarry in the grounds of Ravelston Cottage de- 
serves mention, since it contains Ceriodaphnia quadrangula 
and Scapholeberis mucronata, which are not of frequent occur- 
rence in Mid-Lothian. 
The only piece of brackish water we had an opportunity 
of collecting from was a tiny rockpool on Cramond Island. 
We found it swarming with Harpacticus fulvus, and there 
were also many specimens of Cypridopsis aculeata and Cyclops 
cequoreus. 
In the very small pond at House o’ Hill Farm may always 
