116 A HISTORY OF RECENT CRUSTACEA 



character. Considering the tolerably ruthless manner in 

 which the crab gathers the constituents of its costume, 

 one need not wonder at their needing a little emollient 

 ointment. Under the circumstances their natural ten- 

 dency to adhere might otherwise remain for some time 

 dormant. 



Ghorinus aculeatus, Milne-Edwards, as depicted on the 

 preceding page, is suggestive of a wardrobe provided with 

 a truly enviable number of pegs. In regard to a closely 

 related species, Chorinus longisplna, de Haan remarks that 

 to the hooked setas of the thorax and legs marine odds and 

 ends adhere so closely that they can scarcely be removed 

 without damaging the setae. He is thinking only of man's 

 rude handling, for, however remorseless such a crab may 

 be towards its surroundings, we may feel assured that its 

 deft fingevs will do no violence to the well-appointed furni- 

 ture of its own carapace. 



Pisa, Leach, 1813, is open to the suspicion of being a 

 synonym of Arctopsis, Lamarck, 1801. There are several 

 species of this genus in various parts of the world. The 

 two known in English and Irish waters occur also in the 

 Mediterranean and have a considerable range north and 

 south. These are Pisa tetraodon (Pennant) and the species 

 which Bell calls Pisa Gilbsii, Leach, a name which must 

 be wrong, whatever other is right. Miers with some hesi- 

 tation adopts for it the name Pisa (Arctopsis) tribulus 

 (Linn.). 



Naxia, Milne-Edwards, 1834, is narrowly distinguished 

 from Pisa by the accessory spinules of the two-horned 

 rostrum. Naxia hystrix, Miers (see Plate IV.), was ob- 

 tained by the Challenger at Amboina. 



Lissa : Leach, 1815, is a genus apparently near to Pisa, 

 but with a rostrum consisting of two truncate laminar 

 horns side by side, which are somewhat wider at the ex- 

 tremity than at the base. It was formed for the Mediter- 

 ranean species Lissa chirac/ra (Fabricius), which is deep 

 red in colour, and has the legs so covered with protuber- 

 ances that its specific name, meaning ' gout in the hand,' is 

 not inappropriate, although it so happens that the hands 



