On certain British Freshwater Eutomostraca. 351 



to five each with a similar mark occupying tlie apical two- 

 thirds of the scgmeut ; segments six to eight with a con- 

 spicuous black ring as iu N. unicinguluta, tliis including all 

 of segments six to eight exce|)ting the basal half of the sixth 

 sternite, which is orange ; sternites unmarked. llypo- 

 pygium reddish orange; ninth tergite witii a broad, rounded 

 posterior notch; outer pleural appendage tapering to a long 

 point. 



The female is generally similar to the male, but the 

 occipital mark is less distinct, the prsescutal stripes con- 

 fluent, the scutellum and posterior margin of the postuotuui 

 darker brown, the pleural markings darker. The tergal 

 valves of the ovipositor are long and straight. 



Hub. Rhodesia (Melsetter District). 



Holuiype, S, Chiriuda Forest, October 1905 {G. A. K. 

 Marshall). 



A llutupoti/pe, ? . 



Type iu the collection of the British Museum. 



Nejihrotoma mossambica is closely related to N. uni- 

 cingulata, Alexander (Transvaal to Cape Colony), iu the 

 cingulated abdomen and the apically pubescent wings. It 

 is rtadilv told bv the much more extensive black areas on 

 the mesouotum, the darker legs, the darker wings with the 

 sector short and straight, and by the narrow black markings 

 on abdominal tergiles one to six. 



XLVIII. — Notes on certain British Freshwater Entumostruca. 

 By Robert Gurney, M.A. 



The following notes refer to a few species taken during the 

 past summer, mainly iu Norfolk, some of which have i\"t 

 previously been found in Britain : — 



1. Chirocephalus diaphanus (Prevost)'^. 



On Sept. 12, 1919, I found a number of specimens of 

 the Fairy Shrimp in a small pool on Bratlty Heath by the 



* Dnday, in his " Monograph of the rhyllopoda Anostraca " (Ann. Sci. 

 Nat. xi. I'JlO, p. 200), adouls t)io epecitic uaaie siuyiiulis, Shaw. As n 

 mattor of fact, Shaw is antedated by King (1767), but iu either case the 

 name ia iuadnnseihlo for this Bpecies under Article 31 of the Rules of 

 Nomenclature (see Int. Kev. llvdrnb., Siippl. vi. r.tl4, Ileft '2). Had it 

 not been so, there would be three species in clo?ely-nlHed genera to all of 

 which the name .specific name ^li^:ht be attached, rcirtuiintcly, only one 

 of them {Timymastix stagnaliif, Linn.) can properly claim that uauie. 



