ADDITIONS TO THE FLORA OF ORKNEY 173 



serrnlatus, Fischer ; they are all free-swimming species, which, 

 as I have already pointed out, are more liable to be affected 

 by changes of temperature than those that lodge among the 

 aquatic plants or in the mud at the bottom and sides of the 

 loch. 



I may also mention, in concluding these remarks, that a 

 short time ago, when examining a small gathering of ento- 

 mostraca collected in Loch Leven in June 1890, but some- 

 how overlooked till now, two rare species of Copepoda were 

 obtained. One of these, called Canthocamptus ScJnneilii, and 

 which is frequent in the gathering, was described by Mrazek 

 in 1893, and is new to Britain ; the other is Canthocamptus 

 minutus, Claus, and is also an addition to the British fauna. 

 My friend D. J. Scourfield of Leytonstone, Essex, tells me 

 in a letter recently received from him that he obtained 

 Canthocamptus minutus, Claus, last year in two different 

 localities, viz. one at Wanstead Park, and another in the Isle 

 of Wight ; and though no record of its occurrence has yet 

 been published, to him belongs the credit of its discovery in 

 the British Islands. The fact of its occurrence in such widely 

 distant localities as Loch Leven and the Isle of Wight is an 

 indication, I think, that its distribution in our islands may 

 be really more general than at present it seems to be. 

 Descriptions and drawings of the two species are being pre- 

 pared for publication. 



ADDITIONS TO THE FLORA OF ORKNEY, AS 

 RECORDED IN WATSON'S "TOPOGRAPHI- 

 CAL BOTANY," 2nd Ed. 



By Surgeon-Major H. H. JOHNSTON, D.Sc., F.R.S.E., F.L.S. 1 



BEFORE and since the publication of the second edition of 

 Watson's "Topographical Botany," in 1883, many of the 

 plants named in the following list have been recorded from 

 Orkney by me and others ; but, as the value of botanical 

 records is greatly enhanced by the possession of authentic 



1 Read before the Scottish Natural History Society, on 4th April 1895. 



