THE FAUNA OF SCOTLAND, 



WITH SPECIAL REFERENCE TO CLYDESDALE AND 



THE WESTERN DISTRICT. 



FRESH AND BRACKISH- WATER OSTRACODA. 



Introduction. 



In undertaking the preparation of a Catalogue of the Fresh and 

 Brackish-water Ostracoda, chiefly of the West of Scotland, I have 

 had great misgivings whether at the present time it could be 

 brought to a satisfactory issue. I have to express my thanks to 

 Dr. G. S. Brady for his valuable assistance in all cases of doubtful 

 species. I may mention that the new species in this Catalogue 

 will be described and figured in a joint Paper by Dr. G. S. Brady 

 and myself. 



To approach exhaustiveness, even in the most distant way, the 

 various localities would not only have to be visited once, but several 

 times in the year, as different species appear at different seasons. 

 My opportunities have not allowed rne to visit as many localities, 

 nor these so frequently, as I could have wished, in the West of 

 Scotland, and still fewer in the East ; the list can therefore only be 

 regarded as a record chiefly of characteristic species of the localities 

 which have come under my observation. 



The Fresh and Brackish- water Ostracoda, it is to be remembered, 

 form but a small section of the Entomostraca, and the species will 

 necessarily be fewer when confined to a limited area. The catalogue 

 was at first intended to comprise gatherings only from the West of 

 Scotland, but, on further consideration, it was thought advisable 

 not to limit the boundary strictly to any one part of the country, 

 as the more widely apart they are, the better will the districts show 

 the various aspects of distribution. 



One point in regard to distribution may be noticed, viz., there 

 appears to be a greater dissimilarity of species between the east and 

 west coasts of Scotland than between England and Scotland, In 



A 



Fauna of Scot. — Crustacea I.. Ostrac-uda. 



