140 Proceedings of the Royal Physical Society. 
LACUSTRINE Deposit, NORTH SIDE OF BLACKFORD HILL. 
This deposit does not require any special description 
beyond that already given. The organic remains observed 
in the material examined are such as are usually found in 
small lochs or ponds. The remains of comparatively few 
Molluscs were observed. The following comprise all the 
species of Molluscs and Ostracods we identified in the 
material examined :— 
MOLLUSCA. 
Pisidium fontinale (Draparnaud). Frequent. 
é pusillum (Gmelin). Very common. 
Sphervum corneum (Linné). Scarce. 
Planorbis glaber, Jeffreys (P. parvus, Say). Rare. 
Limneea peregra (Miller). Scarce. 
OSTRACODA. 
Cypria ophthalmica (J urine). Not common. 
» serena (Koch). Common. 
Cypridopsis vidua (Miiller). Frequent. 
Potamocypris fulva, Brady. Common. 
Candona candida (Miller). Not.common. 
Nf lactea, Baird. Frequent. 
»  joubescens (Koch). Rare. 
» jsabeformis (Fischer). Frequent. 
Ilyocypris gibba (Ramdohr). Scarce. 
LIvmmicythere nopinata (Baird). Common. 
LACUSTRINE DEPOSIT AT JORDANVALE. 
The site of this loch is about 4 miles from the sea and 
about 300 feet above sea-level. Molluscan shells, especially 
LTimnea peregra, were fairly abundant in this deposit, as 
were also those of the more common Ostracoda. The 
following species have been identified :— 
MOLLUSCA. 
Spherium cornewm (Linné). Rather scarce. 
Pisidium nitidum, Jenyns. Scarce. 
Ks pusillum (Gmelin). Common 
