2i8 ANNALS OF SCOTTISH NATURAL HISTORY 



The BOSMINID^E. This family contains only one genus Bos- 

 inina; specimens of the common B. longirostris (O. F. Miiller) have 

 been collected in ponds in the Duthie Park and in Loch Callater. 



The LYNCODAPHNID^E are represented in the gatherings recently 

 collected by, at least, three species, viz. Drepanothrix dentata (Euren), 

 Acantholeberis curvirostris (O. F. Miiller), and Ilyocryptus sordidus 

 (Lievin). Drepanothrix was obtained in Bishop Loch and in Loch 

 of Park : it is readily distinguished from its near allies by the hook- 

 like process on the dorsal margin of the shell. The distribution of 

 this species appears to be co-extensive with the British Islands. 

 Acantholeberis was obtained for the first time in Aberdeenshire in 

 a gathering of Entomostraca from Loch Callater, which Mrs. T. 

 Wemyss Fulton kindly presented to me. Loch Callater, which is 

 situated a few miles to the south of Braemar and near the road 

 leading over the hills to Glen Dole and Glen Clova, has an 

 elevation of considerably over a thousand feet above sea -level, 

 and Ithis adds very much to the interest of the gathering. The 

 Acantholeberis was one of the most common of the species observed 

 in the Loch Callater gathering, and many of the specimens were 

 of large size and carried pseudova ; the species has, more recently, 

 been observed also in Bishop Loch near Parkhill. Ilyocryptus, 

 the third Lyncodaphnid referred to, though not previously recorded 

 from Aberdeenshire, probably occurs in most of the lochs of 

 Scotland ; its shell is usually more or less coated with mud, which 

 prevents it from being readily noticed ; it has been observed in Loch 

 of Skene, in Corby Loch, and Bishop Loch. 



The LYNCEID^E obtained in the Aberdeenshire lochs recently 



examined comprise several comparatively rare forms, and a few of 



these will now be referred to. Alona temticaudis, G. O. Sars, which 



is considered to be a rare species in Scotland, was obtained in a 



gathering from Loch of Park ; in this species the post-abdomen is 



narrow and moderately elongate, the upper and lower margins are 



nearly parallel, and the marginal setas are comparatively small except 



at the posterior angle at the base of the claw, where there are a few 



moderately long setae. Alona rustica, T. Scott, was obtained in 



Bishop Loch. Alona intermedia, G. O. Sars, was also observed in 



this loch as well as in Corby Loch (this species is described in some 



of my previous papers as Alona neglecta, T. Scott). 1 The very 



small, but pretty, Alonella nana (Baird) and Alonella exigua (Lillje- 



borg) 2 were both obtained in Corby Loch and Bishop Loch, while 



the second was observed also in Loch of Skene. Pleuroxus 



itncinatus, Baird, Pleuroxus law's, G. O. Sars, and Pleuroxus 



trigonellus (Miiller) were obtained in a gathering from Loch of 



1 See remarks on this species in the "Seventeenth Annual Report of the 

 Fishery Board for Scotland," part iii. p. 200 (1899). 



2 See also remarks on this species, op. cit. p. 201. 



