DESCRIPTION OF TWO RARE CRUSTACEANS. 15 



Committee. 



Rev. Geo. C. Abbes, B.A. 

 Albany Hancock. 

 Thomas J. Bold. 

 John Thompson. 

 George Wailes. 

 Thomas Austen. 



Eichard Howse. 

 Jos. Blacklock. 

 Frederick J. Peck. 

 St. J. Crooks. 

 Alex. S. Stevenson. 

 W. H. Brown. 



I. — Description of Two Rare Crustaceans from the Coast of Durham, 

 one of them a New Species. By C. Spence Bate, Esq. 



Kroyera arenaria, Spence Bate. (PL II. fig. 1.) 



Antennce inferiores quam superiores sunt longiores. Gnathopoda 

 secunda sunt cheliformes; carpi producuntur ultra dactylorum extre- 

 mitates. Super regiones dorsales posteriores, nuUcedentes. 



The inferior antennse are longer than the superior. The second 

 gnathojwda are cheliform, and have the caipi inferiorly produced, 

 so as to extend beyond the fingers of the claw. There are no 

 teeth xipon the median dorsal line. 



This species differs from the one on which the genus was 

 founded, chiefly in the absence of the carinated dorsal ridge, and 

 in the peculiar form of the second gnathopoda. In K. Carinata 

 they are sub-cheliform, but the carpi are produced so that they 

 reach beyond the extremity of the fingers — a peculiarity I never 

 saw in any other crustacean. 



The head is produced and curved downwards, more like a pro- 

 jecting hood than a rostrum. The eye is not visible in the only 

 specimen that I have seen. The upper antenn£e reach beyond 

 the extremity of the peduncle of the lower. The first gnathopod 

 is sub-cheliform, the carpus being produced so as to antagonise 

 with the extremity of the dactylos. The two pair of anterior per- 

 ciopoda are furnished each with a brush of cilia, upon the anterior 

 extremity of the propodos ; a similar brush is also placed on the 



