150 



fORYSTlDyE. 



it occurs in Mr. Bean's collection at Scarborough. In the 

 Frith of Forth it is mentioned by Mr. Goodsir as being 

 very rare. Mr. Thompson records its occurrence as an 

 Irish species in Roundstone Bay, Connemara ; Mr. Ball 

 found several on the beach at Portmarnoch after a storm ; 

 and Captain Portlock obtained it " by deep dredging in 

 Belfast Bay, in the course of the Ordnance Survey.' 11 * 



The vignette is an illustration of the sign Cancer, from 

 a thirteenth century drawing, contained in the Prayer- 

 book of Queen Mary in the British Museum. 



6 Thompson, Ann. and Mag. Nat. Hist. vol. x. p. 285. 



