MR. R. GURNEY ON FRESH- AND BRACKISH- WATER CRUSTACEA. 647 
Cyclops macrurus, Sars. The only place in which C. maci'urvs 
is at all common is Barton Broad. 
„ prasinus, Fischer. Very rare. Sutton, Calthorpe and 
Wroxham Broads, and a pond at Dilham. 
„ affinis, Sars. 
,, fimbriatus, Fischer. Like the preceding species, rare 
in individuals but widely distributed. 
,, phaleratus, Koch. Sutton, Catfield Fen, South Walsham 
and in a brick pit at Bound Bridge (near Calthorpe). 
,, /EQUoreus, Fischer. A brackish-water species, only found 
within the broads district, in the Muckfteet, and in 
a ditch by Berney Arms on the Yare. In the 
Muckfleet it was only noticed at a time of very 
high salinity. 
Harpacticidjj. 
Ectinosoma curticorne, Boeck. Fairly common in Breydon Water, 
this species runs a short distance up the Yare, and 
I have found it also in Oulton Broad. 
Tachidius brevicornis (O. F. Muller). In the Yare at Cantley, 
and in the Bure at Six-mile House. At Cantley 
the water was at the time, and I believe nearly 
always is, practically fresb. 
„ littoralis, Poppe. This species, which has been 
described by Mr. Scott under the name of T. cra&ri- 
romis, has, so far as I know, only been recorded 
in Britain from shore pools in Scotland. In Norfolk 
it is common in the rivers Bure, Yare, and Waveney, 
as far up as the salt-water reaches ; but it also ranges 
beyond this limit into fresh water, and has even 
occurred in South Walsham and Ranworth Broads. 
It abounds in Heigham Sounds, and is found in the 
Mucktleet and in Oulton Broad. 
Canthocamptus staphylinus (Jurine). Common everywhere in 
winter, but decidedly rare during the past summer. 
„ palustris, Brady. In Oulton Broad only, where 
it was also found by Mr. Brady. 
„ mixutus, Claus. 
