174 
HISTORY OR BRITISH CRUSTACEA. 
Gen. 72. SULCATOR,^ Spence Bate . 
Upper antennae half as long as the lower, forked with 
two filaments. Lower antennae with the second joint flat- 
tened. Second and third pairs of legs two-clawed. Telson 
double. 
So called by Mr. Bate, from the furrow which the species 
make in the wet sand when crawling. 
Sulcator arenarius. Sand-ploughing Screw . — Ante- 
rior coxae largely developed. Basis of three hind legs de- 
veloped in the form of scales, claws of these legs obsolete. 
Colour of a pale muddy grey. 
Falmouth (Dr. Leach) ; Oxwich and Rhosilly Bay, near 
Swansea (Spence Bate); Moray Firth (Rev. Mr. Gordon). 
Mr. Bates says of this species, that, “ unlike the Tallin, 
Gammarus, and other allied genera, it is remarkably sluggish 
in its habits, and lives almost wholly beneath the sand, into 
which it burrows, and from which it appears only to come 
out just after the receding of the tide, when it gropes to 
the distance of about a foot, and again burrows beneath its 
surface. The legs, which by their formation are all lessened 
* Spence Bate, Ann. and Mag. Nat. Hist., 1851, p. 818. Originally de- 
scribed under the name of Bellia , a name preoccupied by Milne-Edwards in 
Crustacea. 
