336 Proceedings of the Royal Physical Society. 



Ostracoda from various lochs in the vicinity of Edinburgh, 

 and in my remarks concerning them I referred to Dudding- 

 ston Loch as being the only known British habitat for 

 Cyprois flava. I afterwards sent some specimens to Mr David 

 Eobertson, F.L.S., Millport, C umbrae, and in a letter he sent 

 me later on he says, " having these to compare by, I find that 

 I have one of the same from Burnside Loch, near Eutherglen. 

 It is one that was on my type-slide marked doubtful." 

 This, taken in connection with its occurrence at Kirkland, is 

 interesting, as indicating the possibility of the species having 

 a wider distribution both in time and space than was 

 previously supposed, and also tends to prove that it is indi- 

 genous and not an introduced species, as might have been 

 thought had nothing further become known as to its distri- 

 bution in Britain, than that it was found in the loch at 

 Duddingston.^ Another interesting relic from this deposit is 

 the remains of an Amphipod, probably Gammarus Jluviatilis. 

 Unfortunately, though the specimen is sufficiently perfect to 

 show undoubtedly that it is an Amphipod, it is not perfect 

 enough to allow of a more exact identification. It is notable 

 that Amphipod remains are not common in these deposits — 

 in fact, this is the first specimen I have observed, although 

 material from many and different places has been examined. 

 Somewhat analogous to this is the comparative rarity of the 

 remains of Brachyurus Crustacea in the glacial clays of 

 Scotland. It may, I think, be safel}^ affirmed that these 

 organisms were not uncommon during the formation of the 

 deposits referred to, but it would appear that further investi- 

 gation is required ere a satisfactory answer can be given to 

 the question why their remains are so rarely met with in the 

 Scotch post-Tertiary deposits. 



It appears from the nature of this marl, and from the 

 organisms contained in it, that it has been formed in a loch, 

 or rather lochan, of perhaps limited area, but of considerable 

 depth. The pond or lochan known as Corstorphine Loch 

 (to the west of Edinburgh) seems to represent fairly well 

 the physical conditions of the ancient Kirkland lake. The 



^ It is probable that Cypris gibbosa (Baird), recorded by Dr Baird from a 

 ditch near the Surrey Zoological Gardens, June 1836, is Cyprois flava. 



