G50 Editorial Note. 



4. Leander longirostris (Milne-Edwards). 

 Milne-Edwards, Hist. Nat. des Crustaces, ii. 1837, p. 392. 



In some notes on tlie Crustacea of the East Norfolk rivers, 

 published in 1907 * I recorded the occurreiicG of Leander 

 squilla in one of tlie Broads over 20 miles from tiie sea, and 

 tiie same species lias from time to time been taken since then 

 at various points in these rivers, wiiile it is known to be 

 abundant at times in Biejdon Water and in Oiilton Broad. 

 Having recently had occasion to re-examine my old specimens, 

 and to compare them with a number recently taken from 

 Breydon Water, it at once became evident that m^' original 

 identification was not correct. The work of Stanley Kemp t 

 and of De Man X has now made the identification of the 

 European species of Leunder comparatively easy, and there 

 can be no doubt that this Norfolk prawn is really L. longi- 

 rostris, M.-Edvi'., a species which has not hitherto been 

 recorded as British. It is common in the rivers Bure and 

 Waveney, and probably also in the Yare, and prefers water 

 of low salinity. It is known on Breydon as the "Jack 

 {Shrimp,'^ and is regarded as a freshwater species, since it 

 is most abundant when the water is least salt. It is not 

 found in the sea nor anywhere on the coast of Norfolk, its 

 place being taken in the salt-marshes from Hunstanton to 

 Cley by Leander squilla. 



I have been able to obtain most of the stages of the larval 

 development both of L. longirostris and also oi L. squilla^ 

 but there are certain points with regard to life-history and 

 distribution which require further investigation and to 

 deserve more detailed treatment on a later occasion. 



Editorial Note. 



The Editors desire to draw the attention of Contributors to tlie 

 Ilecommendatiou of the British Association Committee ou Zoological 

 bibliography and Publication that the ordinal (or class) position of 

 a group treated in any paper should be clearly given in the title or 

 in parentheses following the title. It is felt in many quarters that 

 the value of papers appearing in these pages would be much in- 

 creased if this course were more generally followed, and an appeal 

 is therefore made to Authors to adopt the Recommendation. 



* Trans. Norf. & Nor. Nat. Soc. viii. p. 481. 



t Fisheries, Ireland, Sci. Invest. 1908, i. 1910, p. 127. 



X Tijdschr. Ned. Dierk. Vereen. xiv. 1915-16, p. 117. 



