rt 
branched cells with very large nuclei, containing a nuclear network 
and nucleoli. The second kind of cell is usually irregularly triangular 
with a small dark nucleus. These two kinds of cell are both usually 
present, but in very varying proportions; at present I can form no 
opinion as to their significance. 
In the Dipnoi nothing is known of the suprarenals. In Proto- 
pterus annectens, NEWTON PARKER describes certain masses 
of brown cells around the kidney, which, he says, remind one of 
the adrenal bodies of Amphibia. I have examined this point with 
some care both in Protopterus and Lepidosiren. I have 
carefully compared both these with the pigment patches in other 
parts, and find that they are quite comparable to these, so that, 
on the whole, I am inclined to the view that they have nothing 
to do with the adrenals. Besides, there is really very little 
resemblance in these pigment masses to the cell-columns and 
masses of the Amphibian suprarenal. But there is a very striking 
resemblance between the large-celled adenoid tissue which surrounds 
the kidney, and the suprarenals of a frog. In some parts of this 
tissue the masses of cells seem to be arranged in a columnar manner, 
and darkly-stained masses are seen here and there which remind one 
forcibly of the medullary substance in the suprarenals of Amphibians. 
But although I am convinced that somewhere in the neighbourhood of 
the kidney suprarenals will be discovered, my specimens were not 
sufficiently fresh to warrant me in deciding that they are constituted 
by the above tissue *). 
Relations of the suprarenals to the head-kidney in 
Teleosts and Ganoids. 
1) All Teleosts and Ganoids, as far as is known at 
present [except Lophius, Dactylopterus, Fierasfer, 
Orthagoriscus mola, Mora mediterranea?), and the Ma- 
cruridae?)| have a “lymphatic head-kidney”. 
2) This head-kidney is a lymphoid organ with a probable blood- 
destroying function. 
1) See footnote, P. Prrsır does not give any histological details. 
Thus, he does not state whether the suprarenals of Protopterus con- 
sist of cortex and medulla. This is to be regretted as it is a matter of 
much interest. 
2) Hort and CatpErwoop, “Survey of Fishing-grounds, ete.”. Scientif. 
Trans. Roy. Dub. Soc., Vol. V (Ser. 11), IX, 1885. 
