174 HISTORY OP BRITISH CRUSTACEA. 



Gen. 72. SULCATOR * Spence Bate. 



Upper antennse half as long as the lower, forked with 

 two filaments. Lower antennse 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 Bhosilly Bay, near 

 Swansea (Spence Bate) ; Moray Firth (Rev. Mr. Gordon) . 



Mr. Bates says of this species, that, " unlike the Talitri, 



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. aud Mag. Nat. Hist., 1851, p. 318. Originally de- 

 scribed under the name of Bellia, a name preoccupied by Milne-Edwards in 

 Crustacea. 



