of the Fishery Board for Scotland. 



255 



practically identical. I have not yet been able to ascertain satisfactorily 

 which name was first published, and am therefore unable to say which 

 has precedence of the other ; in any case, the difference in the time of 

 publication is not more than two or three months. Meantime, I have 

 adopted Mrazek's Ophiocamptus, — leaving the question of priority to be 

 settled afterwards. 



Ostracoda. 



Comparatively few Ostracoda were obtained in the lochs referred to in 

 this paper. A few of them, however, may be noted here. Cycloeypris 

 globosa (G. 0. Sars) was obtained in St German's Loch, but in none of 

 the others. Candona rostrata, Brady and Norman, and Candona fabai- 

 formis (Fischer), were both found in Possil Marsh, which appears to be a 

 new station for them. Candona Kingsleii, B. and E., were obtained in 

 Loch Cadha M6r, in Barra, and in Loch Skealtar, North Uist, and both 

 are new stations for this species. Darwinula Stevensoni, B. and R,, this 

 interesting species was obtained in three lochs, — in Loch Doirlinn, Barra, 

 Loch Skealtar, North Uist, and in Loch Lubnaig, Perthshire, which are 

 all new stations for Darwinula, 



Cladocera. 



Several interesting species of Cladocera have been obtained in the 

 lochs described in the preceding pages. Sida crystallina (Muller) was 

 obtained in six of the lochs. Bosmina longirodris (Muller) was a com- 

 paratively common species, and the specimens varied greatly in size. 

 In Plate II. figs. 22-25, I have shown figures of two specimens from 

 two different localities : the larger measured -84 mm. of an inch), but 

 the size of the smaller was only -43 mm. of an inch), yet the difference 

 between them otherwise is very little, as shown by the drawings. 



Latona setifera (Muller) was obtained in two of the Perthshire lochs — 

 Lochan Lairig Eala and Loch Lubnaig, but in none of the others. 



Holopidium gibberum, Zaddach, was only observed in one of the lochs 

 — viz., Lochan a Chaite on Ben Lawers. 



Drepanothrix dentata (Euren), was obtained in six of the lochs — in 

 Lochan nam Faoileann (North and South), Barra ; in the three lochs of 

 North Uist ; and in Loch Lubnaig, Perthshire. 



Acantholeberis curvirostris (Muller). This fine species was obtained in 

 seven localities — three in Barra, three in North Uist, and in Lochan 

 Lairig Eala, Perthshire. 



Leydigia quadrangidaris (Ley dig). This rare species was obtained in 

 St German's Loch, which is the third station for it in Scotland ; it 

 appears to be quite distinct from its near ally, Leydigia acantho- 

 cercoides, Fischer, which I have not yet observed in any of the Scotch lochs. 



Alona neglecta, n. sp., and Alona rustica, n. sp., are two species that 

 are apparently undescribed. Descriptions and figures of them will be 

 found at the end of the Report on the lochs of Shetland prepared by 

 Robert Duthie, Fishery Officer, and myself. They are small species, and 

 this may account for their apparent rarity in the gatherings from the 

 lochs described in this paper. Alona negleeta was obtained in Loch 

 Scadowa and Loch Skealtar in North Uist, and in Loch Lubnaig, Perth- 

 shire. Alona rustica was obtained in Loch Cadha M6r, Barra^ and in 

 Loch Scadowa, North Uist. 



Geriodaphnia reticulata (Jurine) is not unfrequent in Possil Marsh, but 



