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. 



