CRUSTACEA FROM EAST COAST OF SCOTLAND 155 
Thysanoessa borealis G O. Sars). 
meeucc2, TL, hysanoessa borealis, “Oversigt over Norges 
Crustaceer,” Bd. I. pp. 52, 53. 
This Schizopod has been obtained in various parts of 
the Firth of Forth, but never in quantity—one, or at most 
only a few specimens being taken at a time. TZhysanoessa 
has the first pair of legs long, but not so long or so slender as 
those of Wematocelis, which it somewhat resembles. It is 
further distinguished from Mematocelis by the penultimate joint 
of the first pair of legs being provided throughout its length 
with stout ciliated sete, the last joint—which is very small 
—hbeing also furnished with a number of hairs. On the other 
hand, the first pair of legs in Wematocelzs have both the pen- 
ultimate and antipenultimate joints (which are long and 
slender) naked, but there is a bunch of spiniform setz at the 
apex of the legs. The first legs are very easily broken, so 
that in handling specimens, or in collecting them, great care 
is required to keep the legs intact. We are indebted to the 
Rev. A. M. Norman for the name of the 7hysanoessa here 
recorded. 
Among a few specimens of Forth Schizopoda forwarded 
to Dr. Norman for identification, and which included the 
Thysanoessa referred to above, he observed what he considers 
to beaspecimen of JVematocelis megalops (G. O. Sars); but the 
specimen he examined, and one or two others that seem to 
belong to the same species, having lost their first legs, and 
thus wanting the character which chiefly distinguishes them, 
immpiepoernaps: better tor the present to leave the claim of 
Nematocelts megalops for a place in the Forth fauna in abey- 
ance till more satisfactory specimens turn up. Dr. Norman 
informs us that WVematocelts megalops was sent to him from 
Banff by Thomas Edward twenty or thirty years ago ; from 
ppedeenm by Mir. Sim in 1872; and that it has quite 
recently been obtained at Redcar. 
The eyes of 7hysanoessa and Nematocelis have a marked 
constriction near the middle, which divides the eye into what 
appears to be a lower and upper eye, and thus imparts to 
them a peculiar and rather striking appearance, and which 
