— 267 — 



fo a Iess extent, in Hickling Broad. A certain amounl is 

 probably due to sali carried as spray from Lhe sea, whiclj is 

 110 more llian two miles :i\v;i> (1). 



The îrsuli of the higli salinitv is seen in the rather soanty 

 Crustacean l'anna and in the présence of such brackish-water 

 species as Neomysis rulgaris, Gammarus Duebeni and Cor- 

 dylophora lacustris, while Palaenom squilla and < orophium 

 grossipeshaxe been taken in Heigham Sounds. 



The range of salinitv in the river is not co-extensive with 

 llie range of iidal oscillation. Whereas the «Chemical tide» 

 ceases al Acle, the tidal wave is felt distinctly as far as 

 Horning of the Bure, Ludham Bridge on the Ani and 

 Potter Heigham on the Thurne. But beyond (hese points 

 iliere is a distinct rise and l'ail of the water level. tKough il 

 becomes more and more irregular and difflcult to bring info 

 relation with iidal periodicity. 



The range of what mav be called brackish-water Crustacea 

 does not agrée with eitlier eonstilueiil of the Tide. Certain 

 l'omis, such as Palàemonetes, rang» 1 as far as Ant Mouth in the 

 Bure, Co?'ophium grossipes lias been l'onnd in Barton Broad 

 and Heigham Sounds and seems to correspond in range 

 with Cordylophora, in the colonies of which if so ol'ten lives. 

 Besides thèse, Eurytemora affînis and Tachidius littoralis 

 are l'onnd as far as Ranworth, and the former lias even been 

 found in Sutton Broad. Eurytemora lacinulata lias esta- 

 blished itself ail over the whole Bure System. 



THE WORK OF THE LABORATORY. 



In view of the i'act tliat the Laboratory is situated in the 

 centre of the fi rsl two groups of Broads in which there is no 

 irue pelagic l'auna, it lias been thought best to make noattempt 

 ai quantitative work of the kind which figures so largely in 

 the reports of fresh- water biological stations on the Continent 

 and in America. It is onr first business to investigate the 

 nature of the fauna from (lie spécifie and distributional point of 

 view, a large work which can onlv lie doue efficiently by the 

 co-operation of several persons specialising on differenl groups. 



(1) An analysis ofsoil from Sutton, made by Dr. Playfair, showed the 

 présence of 2 " ,, of Sodium Chloride, attributed to proximity to the sea. 



