KROYERA ARENARIA. 
175 
with hair ; the fingers are short, stout, and directed for- 
wards. The last pair of legs are very long,* having the 
thigh oblong, the metacarpal joint posteriorly dilated 
and inferiorly produced, but not so largely as in the 
preceding pair ; the hand is long and straight ; and the 
finger is very long, straight, styliform. The caudal 
appendages are double-branched, the posterior pair hav- 
ing the peduncle much shorter than that of the others. 
The terminal plate is single, scale-like, dorsally cupped, 
and tipped with a few hairs. 
The first specimen which we received of this species 
was sent to us by Mr. Albany Hancock, who took it on 
the beach near Sunderland, near the spot given in the 
vignette (p. 176), which was kindly drawn for this work 
by Miss M. Hancock. 
This crustacean formed the subject of observation by 
Mr. Hancock, on account of the tracks which it makes 
in the sand, described in his “ Memoir on Vermiform 
Fossils,” read at the Meeting of the British Association 
at Leeds, September 22nd, 1858, and published in the 
“ Annals of Natural History,” ser. 3, vol. ii., as well as 
in the “ Transactions of the Tyneside Field Naturalists’ 
Club,” vol. iv. pt. 1, for 1858. 
Mr. Hancock says that the track of this species “ is 
in the form of a narrow wedge-shaped furrow, about 
two-tenths of an inch wide, with margins occasionally 
a little elevated. Its windings are very capricious, 
irregularly rounded, frequently abruptly angulated, and 
sometimes, for a considerable distance, finely and regu- 
larly zig-zagged. This species (of tract) is often 
* By an oversight, it has been figured with a joint too much, the hand 
being repeated ; the space, in fact, between the extremity of the metacarpus 
and the base of the finger, should have been divided into two, instead of 
three portions. 
