76 ° 
the pylorus, the lower surface of the stomach and the 
distended gall bladder. The bile duct (Zd.) lies imme- 
diately underneath it. It is covered over or attached by 
the mesenteric sheet connecting the duodenum and suc- 
ceeding portion of the intestine to the liver. A prominent 
branch of the cceliaco-mesenteric artery (A.sp. fig. 22) 
supplies it with blood. It is oval in shape, and in a large 
fish is about 1 to 2cm. in longest diameter. It is black in 
colour, and is very soft and easily torn. Its structure is 
the characteristic splenic one. ‘There is a strong fibrous 
investment which is continuous with strong trabeculee 
passing inwards: and dividing the whole gland up into 
lobules. The reticular formation within the lobules is 
filled with the characteristic splenic pulp, and in the 
centre of each lobule is a mass of densely aggregated 
lymphoid cells round which the texture of the pulp is 
looser. A prominent vessel passes to each of these 
nodules. ‘This structure is best seen in the organ of quite 
small fish, as in larger specimens it is much more obscure, 
and granular masses of black pigment are abundantly 
present. These pigment masses are composed of rounded 
granules of variable diameter. 
The Supra-renal Bodies are situated on the morpho- 
logical dorsal (spinal) surface of the kidney on the perpen- 
dicular surface which is apposed to the Ist haemal spine 
at about 4 of the length of this surface from the extreme 
tip of the kidney. To display them the kidney must be 
removed from the body, and since this is difficult on 
account of the soft pulpy nature of the organ in the fresh 
condition, the dissection is most conveniently carried out 
on preserved specimens. ‘The structures in question are 
then seen as two oval or rounded bodies lying close 
together, one on each side of the middle line to right and 
left of the common genital artery (A.gen.) at the point 
