OF THE EAST NORFOLK RIVERS. 
435 
Leptocheirus sp. 
Several specimens of a small Amphipod were taken on piles 
by the Muckfleet, and also near Stokesby during a high salt 
tide last year (1905). They were sent to Canon Norman who 
tells me that they belong to the genus Leptocheirus but do not 
agree with any of the known European species. They resemble 
in the characters of the gnathopods, the American L. pinguis, 
Stimps — but “ as a dwarf to a giant.” 
Corophium grossipes (Linn.). 
In the Victoria County History — Norfolk, Mr. Stebbing 
records C. crassicorne, Bruzcl, from the Thurne River. I have 
searched for this species up and down the rivers for four years 
but have failed to find any trace of it. C. grossipes is a species 
of a very wide range, being found abundantly at Berney Arms, 
and I expect on Breydon, but extends also far up the rivers. 
It is fairly common as far up as Acle and I have found it at 
Ant Mouth, Ludham Bridge and Heigham Sounds. It seems 
to be especially fond of living in colonies of Cordylophora 
and very probably its range is coextensive with the latter. 
It seems to thrive well in fresh water, in which respect it 
approaches Paracorophium excavatum, Thomson, which lives 
in the lakes of New Zealand. 
COPEPODA. 
Cextropages typicus, Kroyer. 
,, HAMATUS (Lillj.) 
Temora longicornis (Muller). 
Acartia discagdata, Giesb. 
„ LOXGIREMIS, Lillj. 
These five species of Calanoida are all strictly marine, 
and have only been met with occasionally in the rivers in 
practically salt water. The highest point at which any of 
them have been taken is in the Bure at Thurne Mouth. 
Euterpixa acutifroxs (Dana). 
(For Euterpina in place of Euterpe, Claus, see Norman, 
Ann. Mag. Nat. Hist. (7), vol. xi., 1903.) 
