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. 

 „ pusillum (Gmelin). Very conmion. 

 Spha:riimi corneum (Linne). Scarce. 

 Planorhis glaher, Jeffreys (P. jparvus, Say). Bare 

 Limncea peregra (M tiller). Scarce. 



ostracoda. 



Gyp^ia ojphthalmica (J urine). Not common. 



„ serena (Koch). Common. 

 Cypridopsis vidua (Mliller). Frequent. 

 Potamocypris fulva, Brady. Common. 

 Candona Candida (Milller). Not common. 



., lactea, Baird. Frequent. 



, piibesccns (Koch). Eare. 



„ fabocformis (Fischer). Frequent. 

 Ihyocypris gihha (Kamdohr). Scarce. 

 Limnicythere inopinata (Baird). Common. 



Lacustrine Deposit at Jordanvale. 



The site of this loch is about 4 miles from tlie sea and 

 about 300 feet above sea-level. Molluscan shells, especially 

 Limnma peregra, were fairly abundant in this deposit, as 

 were also those of tlie more common Ostracoda. The 

 following species have been identified : — 



MOLLUSCA. 

 Sphmrium corneum (Linne). Bather scarce. 

 Pisidium nitidinn, Jenyns. Scarce. 

 „ 'pusillum (Gmelin). Common. 



