ON THE NOMENCLATURE OF BRITISH PLANTS 217 



D. chilenense, Plate. In the previous paper on Forth Tardigrada, 

 and in several other papers, I have in error spelt the name 

 chilense, though I now find that Dr. Plate spelt it chilenense. 



D. scoticum, Murray. In the key to the genus Diphascon, given in 



the previous paper, there is a mistake made in distinguishing 

 this species from D. spitzbergense, Richters, by the thickenings 

 in the pharynx. Dr. Richters has since sent me specimens of 

 D. spitzbergensc, and I find that the rods of the pharynx are 

 alike in the two species. D. scoticum is distinguished by the 

 much more slender gullet, oval pharynx, and lenticular bodies 

 in the cells of the stomach. The mistake arose through Dr. 

 Richters identifying a Scottish species, not yet described, as 

 D. spitzbergeiise. 



Additional localities : Winchburgh, Thornton, Davidson's 

 Mains, and Bavelaw. 



These additions bring the list of Tardigrada known to occur in 

 the Forth area up to 18, but two of these are not yet named. The 

 complete list of the species identified is here appended : 



Echiniscus arctomys, Ehr. M. ornatus, Richters. 



E. mutabilis, Murray. M. macronyx, Doy. 



E. wendti, Richters. Milnesium tardigraduin, Doy. 



E. granulatus, Doy. Diphascon chilenense, Plate. 



E. spitzbergensis, Scourfield. D. scoticnvi, Murray. 



Macrobiotus hufdandi, Schultze. D. biillatnm, Murray. 



M. inter medius, Plate ?. D. angustatum, Murray. 



M. echinogenitus, Richters. D. oculatum, n.sp. 



EDINBURGH. 



ON THE NOMENCLATURE OF BRITISH PLANTS 

 AS AFFECTED BY THE LAW ADOPTED BY 

 THE BOTANICAL CONGRESS AT VIENNA. 



By G. CLARIDGE DRUCE, Hon. M.A., F.L.S. 

 Secretary of the Botanical Exchange Club of the British Isles. 



THE rule which was passed by a majority of botanists 

 attending the Vienna Congress in 1905, which insists on 

 the earliest specific name being retained in the valid name, 

 except in such instances where the original specific name 

 is now employed in a generic sense, or where the specific 

 name has already been used to designate a plant in the 

 same genus, leads if adopted to a considerable change in 



