NORTHERN STONE-CRAB. 167 



third and fifth by much smaller marginal pieces between 

 the second and fonrth, and the fourth and sixth respective- 

 ly ; the terminal joint is also nearly oval and entirely 

 crustaceous. 



The colour is yellowish red ; the spines darker, the 

 under surface paler. 



In. Lines. 

 Length of carapace ....... 5 



Breadth of carapace ...... 4 



Length of larger anterior leg . . . . .55 



Length of leg of the third pair .... 8 



This remarkable species must be considered as one of the 

 rarer of our British Crustacea. It is, strictly speaking, a 

 northern species, not having yet been found farther south 

 than the Isle of Man ; with the exception of a specimen in 

 the Museum of Trinity College, Dublin, recorded to have 

 been taken on the coast of the County Wexford. I pos- 

 sess, through the kindness of my friend Mr. M'^Andrew, 

 several specimens, of various size, taken by him in dredging 

 in Loch Fyne ; they have also been dredged between the 

 Isle of Man and the Mull of Galloway. The Frith of 

 Forth (Goodwin), the Coast of Ayrshire (Thompson), of 

 Aberdeen and of Yorkshire (Leach), are localities where 

 this crab has at different times been obtained ; and I have 

 a specimen which was taken from the stomach of a cod on 

 the coast of Orkney. I am uncertain at what period they 

 cast their spawn. One of Mr. M'^Andrew's specimens, 

 taken in the month of June, was carrying spawn. 



The synonymy of this species has become not a little 

 involved from some slight resemblance which it bears in its 

 external characters to the Maia Squinado, and from a very 

 obvious mistake into which Pennant has fallen in consider- 

 ing it identical with the Cancer Jiorridus of Linnaeus, the 

 Parthenope liorrtda of subsequent naturalists. It is un- 



