642 MR. R. GURNEY ON FRESH- AND BRACKISH-WATER CRUSTACEA. 
Ceriodaphnia quadrangula (0. F. Muller). Widely distributed, 
but nowhere common. The variety S. hamata , Sars, 
seems to be of more frequent occurrence than the 
type form. 
,, pulchella, Sars. 
,, affinis, Lilljeborg. This is the rarest species 
of the genus. Recorded from Sutton, Martham, 
Barton Broads, Candle Dike, Buckenham, and a 
ditch at Ludham Bridge. 
„ laticaudata, P. E. Muller. Rare ; generally in 
small waters, but sometimes also in the open Broad, 
as, for instance, at Hickling. 
Moina rectirostris (Leydig). The only localities known to me 
at present are ponds at Thorpe, Herringfleet and 
Hopton. 
Bosminida. 
Bosmina longirostris (0. F. Muller). 
L Y NCODAPIINID.E. 
Ilyocryptus sordidus (Lievin). Curiously enough, this species 
is capable of withstanding a very high salinity ; for 
it lives in Ileigham Sounds, and has been found 
nowhere more common than in a creek running off 
from Oulton Broad. 
,, agilis, Kurz. Barton, Sutton, Ranworth, Wroxham 
and Rollesby Broads. 
,, acutifrons, Sars. Only recently added to the 
British list, having been discovered by Mr. James 
Murray in Sutherland. In Norfolk it occurs in 
Wroxham Broad, and I have also found it at Sutton. 
Macrothrix laticornis (Jurine). Only recorded at present 
from a pond at Thorpe and in the Waxham Cut 
at Lound Bridge. 
Lathonura rectirostris (0. F. Muller). A common species at 
Sutton and Catfield Fen, but otherwise rather rare. 
Other localities are : Barton, Calthorpo and Irstead. 
LYNCEIDiE. 
Eurycercus lamellatus (0. F. Muller). 
Camptocercus rectirostris, Schoedler. Sutton, Barton, Rollesby, 
Ranworth and Wroxham. A decidedly rare species. 
