434 MR. ROBERT GURNEY ON THE CRUSTACEA 
Idotea viridis, Slabber. 
This species appears to be not uncommon in brackish 
water, but does not occur in company with fresh-water species. 
In a collection taken by Mr. R. A. Todd in Ploughman’s Ham 
by Lake Lothing, in 1903, there were a few specimens of 
Daphnia magna, but all the other species were of a marine 
type. The furthest point up-river at which it has been found 
is Seven-Mile House on the Bure. 
J Hera marina (Fabr.). 
Under stones in the Yare at Berney Arms, and on weed in 
a marsh pool at Burgh Castle. 
Ligia oceanica (Linn.). 
Is a terrestrial rather than an aquatic species, and occurs 
commonly along the banks of the Yare, under stones, as far 
as Reedham. Also found at Oulton Broad, but not met with 
elsewhere. 
Talitrus locusta (Pallas). 
Orchestia littorea (Mont.). 
These are both semi- terrestrial species. The former I have 
only found at Oulton Broad ; the latter is probably abundant 
under stones and flotsam along the rivers, as far as the water 
is decidedly salt. I have found it at Berney Arms, St. Olaves 
and Oulton Broad. 
Melita pellucida, Sars. 
This and the following species were most kindly named for 
me by Mr. A. O. Walker, who informs me that, so far as he is 
aware, M. pellucida has not previously been found in the 
British Area. It is a species which burrows in the soft mud 
under stones and the bark of submerged wood, and has 
occurred in the Bure, by the Muckfleet in fresh water, and at 
Oulton Broad in nearly salt water. 
COREMAPUS VERSICULATUS (Bate). 
— Microdeudopus versiculatus, Bate. See Norman, Ann. 
Mag. Nat. Hist. (7), vol. xvi., 1905, p. 78. 
This species is also a very adaptable one. It was first found 
in company with the preceding one at Muckfleet, but it has 
occurred since at several points on the Waveney and in Oulton 
Broad, and seems not uncommon in rather salt water. 
