HENSLOw's SWIMMING-CRAB. 117 



The first pair of legs are nearly equal : the wrist has 

 two sharp teeth on the anterior margin, of which the 

 inner is much the more prominent, and a third tooth is 

 found at the outer and anterior angle, which forms the 

 commencement of a carina, which extends the whole length 

 of the wrist. The hand is compressed, and has three low 

 but sharp longitudinal carinee, the spaces between them 

 being slightly hollowed : the fingers are much compressed, 

 somewhat incurved, as long as the hand. The three fol- 

 lowing pairs are much compressed, particularly the last 

 two joints ; the terminal one being very thin and lan- 

 ceolate. The last four joints are ciliated on the inferior 

 margin. The fifth pair have the last two joints very broad 

 and flat ; the penultimate being irregularly quadrate, and 

 the terminal one broadly oval, slightly acuminated at 

 the apex. The abdomen in the male consists of five joints, 

 of which the first, second, and the base of the third are 

 transversely carinated ; the third joint is broadest at the 

 base, and becomes moderately contracted with a slight 

 notch ; the fifth is rather acutely triangular. In the fe- 

 male, the abdomen is seven-jointed ; the first three joints 

 transversely carinated; the fifth joint suddenly smaller than 

 the preceding one, and obtusely triangular. 



The colour is a rich reddish-brown, which becomes a 

 pale salmon-colour in drying. The under parts are pale. 



Of this species, which is very local in its distribution, and 

 probably nowhere existing in great numbers, there is a 

 specimen in the Banksian collection in the Linnean Society, 

 which was taken on the coast of Spain. It was first disco- 

 vered on our shores by Professor Henslow in a herring-net, 

 on the north coast of Devon, in 1817, and by him com- 

 municated to Dr. Leach, who named the species after its 

 discoverer, assigning to it also a new generic appellation. 

 It was afterwards found by Mr. Prideaux on the south- 



