214 Proceedings of the Royal Physical Society. 
is 1 inch long, and has ten fin rays ; the right or under fin 
about J 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 IJ inch 
in length by IJ 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 IJ inch, and says the female 
is much smaller. The female specimen exhibited measures, 
however, fully IJ 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 Ehomhus hirtus just described, and this Circular Crab, 
to the Natural History Museum of the University, through 
our Assistant-Secretary, Mr J. B. Davies. 
