77 
where the latter vessel leaves the kidney. ‘They are 
yellow or pink in colour, and contrast strongly with the 
pigmented kidney. In a specimen of about 22 inches in 
total body length, the largest measured 5°5mm. in longest 
diameter. They le in little cavities in the kidney tissue, 
but project slightly above the surface of the latter, in the 
capsule of which they are enclosed. Their blood supply 
is from a twig of the common genital artery, and their 
minute structure is somewhat similar to that of a 
lymphatic gland. The capsule is continuous with a system 
of fibrous trabeculee traversing the whole organ. ‘These 
trabeculze form the coarser bars of a reticulum the meshes 
of which are crowded with small cells which may be 
described as lymphoid in appearance. According to 
Vincent they are secreting glands affecting the composi- 
tion of the blood by furnishing an internal secretion. 
Until comparatively recent times it was supposed that 
the suprarenal bodies were absent in Teleostean fishes.t 
It has, however, been shewn by Vincent* that they are 
probably universally present. As is well known, the 
suprarenals of mammalia consist of two morphologically 
distinct portions—the cortex and medulla. The latter has 
been stated to have been derived from certain of the sym- 
pathetic ganglia, and concerning the former an interesting 
suggestion has been made by Weldon and Grosglik. It is 
certain, however, that the most important relations of the 
suprarenal bodies are with the vascular, not the nervous 
system. 
4.—Tnr Renat Oreans. 
The Kidney (figs. 20 and 21) lies along the whole 
dorsal, and part of the posterior wall of the body cavity, 
+ Cp. Weldon—Head Kidney in Bdellostoma—Studies Morph. Lab. 
Cambridge, vol. ii., pt. 1, 1884. 
* Contributions to Anatomy and Histology of the Suprarenal Capsules. 
Trans. Zool. Soc., London, vol. xiyv., pp, 41-84, 1896-8, 
