214 Proceedings of the Royal Physical Society. 



is 1 inch long, and has ten fin rays ; the right or under fin 



about f of an inch long, with eight fin rays. 



Dorsal fin, . . 90 fin rays 



Ventral, . . 6 ,, 



Anal, . . . 70 



Caudal, . . 14 „ 



I have been thus particular in details, as there appear 



still to be doubts about the distinction of the species of this 



genus. (See Proc, Vol. II. , p. 139 and note, and p. 258.) 



(2.) Note of the Atelecyclus heterodon (Leach), the Circular Crab, 

 from the Firth of Forth. By John Alex. Smith, M.D. 



The fine specimen now exhibited was sent to me as a 

 rarity by Mr Charles Muirhead, Queen Street. It was taken 

 on the 14th of July from the stomach of a codfish caught 

 off the Berwickshire coast, near the mouth of the Firth of 

 Forth. 



The crab is a full-grown female. It measures 1J inch 

 in length by 1J- in width. The abdomen consists of seven 

 joints or segments, and is slender in shape, being three times 

 as long as broad. 



Mr Bell, in his " British Stalk-Eyed Crustacea" states 

 that the male is much more abundant than the female. He 

 gives the size of the male as 1J inch, and says the female 

 is much smaller. The female specimen exhibited measures, 

 however, fully 1J inch in length. 



The carapace is granular and rough ; the lateral margins 

 have nine teeth, alternately large and small. It is fringed 

 with hair ; thorax smooth below, the legs all fringed with 

 long hair. 



Only one or two instances of its occurrence in the Firth of 

 Forth have been recorded. It is therefore considered rare, 

 and an inhabitant of deep water, which is borne out by its 

 being found in the stomach of the cod taken in deep water. 



I have much pleasure in presenting the specimens of 

 the Rhombus hirtus just described, and this Circular Crab, 

 to the Natural History Museum of the University, through 

 our Assistant-Secretary, Mr J. B. Davies. - 



