142 Proceedings of the Royal Physical Society. 



occurrence in the Borouoli Loch. The followinfjj are the 

 Mollusca and Ostracoda observed in the material examined 

 by us from this locality : — 



MOLLUSCA. 



Pisiclium nitidum, Jenyns. Frequent. 



„ pusilhiiyi (Gmelin). Frequent. 

 Planorhis nautileiis (Linn^). Scarce. 

 Valvata cristata, Miiller. Common. 



„ piscinalis (Miiller). Common. 

 Limncea peregra (Muller). Very common. 



Several variations in form occurred in the last two species, 

 and especially in the Limnma. 



Ostracoda. 

 Cypria serena (Koch). Frequent. 

 Erpetocypris reptans (Baird). Rare. 

 Candona Candida (Muller). Frequent. 



„ lactca, Baird. Bare. 

 Darwinula stevensoni, Brady and Robertson. Frequent. 



HoLYROOD Lake. 



Though Molluscan remains were fairly abundant in this 

 old lake deposit, only five species have been identified by 

 us, and these are common freshwater species. Ostracoda on 

 the other hand were numerous, both in individuals and 

 species. No fewer than twelve species belonging to nine 

 genera have been observed, and one species, viz., Limnicythcre 

 sccncti-patricii, is now recorded for the first time as fossil in 

 Scotland. The following are the species of Mollusca and 

 Ostracoda observed by us. 



Note. — In a paper read at a meeting of the Edinburgh 

 Field Naturalists and Microscopical Society, in February 

 1888, by Messrs J. A. Johnston and J. Lindsay, on "An 

 Ancient Lake Deposit in Queen's Park" (here called Holyrood 

 Lake), two species of Mollusca, not found by us — viz., Val- 

 vata cristata and Planorhis nitidus, — are recorded as having 

 been observed in the material forming this deposit.^ 



^ See Trans. Edin. Field Natur. and Micro. Soc, vol. ii., p. 138 (Part 2). 



