I 5 8 ANNALS OF SCOTTISH NATURAL HISTORY 



of the Golf Course, and between that and the mouth of the 

 Don. As these pools are not much above the level of the 

 sea, their situation is in marked contrast to that of the lochs 

 and tarns examined by Mr. Clark. A few rare species, both 

 of the Cladocera and Copepoda, were captured in these pools ; 

 but the most interesting feature of their Entomostracan 

 fauna is the comparatively large variety of the Ostracoda 

 observed in them, and which will be recorded in the sequel. 



In the present paper I do not propose to give lists of 

 the Entomostraca obtained in the gatherings from all these 

 various lochs and pools : that may be done later on in a 

 more general report on the fresh and brackish water 

 Crustacea of Aberdeenshire. All I intend to do now is 

 (i) to refer to some of the rarer species found in Mr. Clark's 

 collections, and (2) to notice a few of the forms observed 

 in the pools on the King's Links. 



(i) The Cladocera and Copepoda were well represented 

 in several of these gatherings, but the Ostracoda were very 

 scarce. These captures were made chiefly by tow-netting, and 

 of course this may account, in part at least, for the scarcity 

 of Ostracoda ; but even in the hand-net gatherings which 

 Mr. Clark collected the Ostracoda were somewhat rare, and 

 this agrees to a large extent with my own experience of the 

 distribution of this group in the lochs of Aberdeenshire. In 

 lochs which I myself have examined, where the conditions 

 appeared to be favourable for the development of the 

 Ostracoda, and where special efforts were made to capture 

 them, these organisms, though perhaps plentiful enough 

 individually, did not present the same variety of forms as 

 is to be found in many of the lochs farther south. The only 

 notable exception to this want of variety amongst the 

 Ostracod fauna of the Aberdeenshire lochs which I have 

 yet met with is the comparatively large number of species 

 recently obtained in the pools on the King's Links, and 

 which will be referred to further on. 



Amongst the Cladocera obtained I have to record Holo- 

 pediinn gibberum (Zaddach), and Bythotrephes longiinanus, 

 Leydig, which, so far as I know, have not before been 

 recorded for the county. The Holopedium occurred in 

 Loch-an-eion, but was somewhat rare; Bythotrephes^ on 



