16 DESCRIPTION OP TWO RARE CRUSTACEANS. 



posterior extremity of each of the two next succeeding percio- 

 poda. 



The posterior perciopod is considerably longer than the preced- 

 ing, and has the dactylos largely developed and terminating in a 

 strong cilia, giving to the limb the appearance of another joint. 

 This genus belongs to the sub-family PJioxides, the habits of 

 which are not much known. The present species was taken by 

 Mr. A. Hancock on the sandy shore near Sunderland, where it 

 burrows in the sand ; and I am inclined to think that the whole 

 of the sub-family will be found to be hurrowers also, for which 

 purpose the projecting head appears to be peculiarly adapted. 



SuLCATOR ARENARius, Spence Bate. (PI. II. fig. 2.) 



This species was first described under the name of Bellia, in 

 the *' Annals of Natural History for 1849." The name was after- 

 wards changed to that of Sulcatoi% in consequence of the former 

 having been applied by Mr. Milne Edwards to a genus of de- 

 capods. 



Walking, one day, along the sands of Oxwich Bay, in Gla- 

 morganshire, I noticed, every here and there, a short furrow. It 

 was, generally, about ten inches from end to end. It began and 

 terminated abruptly. Suspecting the maker to be near one of 

 the extremities, I dug and found the above crustacean. I have 

 taken it also in Eosilly Bay, in the same county. The Eev. 

 George Gordon has sent it me from the Moray Frith. A speci- 

 men is in the British Museum, which was found near Falmouth ; 

 and, recently, Mr. A. Hancock has found it burrowing in the sand 

 near Sunderland. 



This genus, like the last, belongs to the sub-family Fhoxides, 

 and possesses the broad, projecting brow. 



