STJPEAEBNAL BODIES IN FISHES. 5T 



on the ventral surface of the kidney, and are usually closely approximated to the middle 

 line. They are only slightly imbedded in the substance of the kidney. The following 

 may be taken as the typical arrangement in the Muraenidse: — 



The suprarenals are about 1-5 mm. in diameter (of course they may be much larger 

 in Conger). They are triangular with rounded corners ; there is one on each side of 

 the middle line and they are nearly in contact. They are on the ventral surface of 

 the kidney, just behind the junction of the crura, and both are on the same level. 

 The bodies are smooth, pale pink, and only slightly imbedded in the kidney. 



Clupeid^. — In Clupea harengus (PI. X. fig. 11) I have found two unequal supra- 

 renals placed on the spinal surface of the kidney at about the mid-point of its length. 



EsociD^. — I have examined two examples of Esox Indus (PI. XI. fig. 12). The 

 first specimen was 50 cm. in length, the second 57, both being young specimens. 



In the first (PI. XI. fig. 12) the suprarenals were two in number, one on each side. 

 They were imbedded in the substance of the kidney, nearer the spinal than the ventral 

 surface, and placed distinctly in advance of the mid-point of the kidney length, so as 

 to be about in the middle point of the length of the body. The bodies are thus 

 even more anterior than in the eels. They were each about 3"25 mm. long by 2 mm. 

 broad. Their surface was distinctly lobulated (PI. XI. fig. 12, s.r.). 



In the second their arrangement appeared at first sight to be identical with that of 

 the first, but, on closer examination, the left was seen to be represented by two bodies, 

 and these were placed slightly in advance of the right one. They were, like those 

 above described, imbedded in the kidney-substance. But in this specimen there were 

 tiny " accessory " bodies, some two or three in number, in difierent parts of the kidney. 

 I have not found, however, anything approaching the condition described by Stannius, 

 in which the posterior half of the kidney is studded with suprarenal bodies. Very 

 possibly this appearance was pathological. 



Salmonid^e. — In a specimen of Salmo salar, 83 cm. long, I found five suprarenals 

 (PI. XL fig. 13, s.r.). There were three on the left side and two on the right. None 

 of them were visible on the ventral surface of the kidney, as they were placed on the 

 lateral or spinal surfaces. The bodies belonging to the right side were situated 

 respectively 20-5 and 20 cm. from the hinder end of the kidney, being placed almost 

 in the middle point of its length. Those of the left side were placed at unequal 

 intervals opposite them. The right suprarenals are respectively 5 mm. and 3 mm. in 

 diameter. The larger is anterior and slightly kidney-shaped. The largest on the left 

 side is directly opposite the larger on the right ; it is 7 mm. by 3-5 mm. and distinctly 

 kidney-shaped. At a short distance in front of this is a body about half its size and 

 likewise kidney-shaped. At a further interval behind it lies an elongated oval one. 

 The suprarenals are very pale pink in colour, almost white, and have a fatty 

 appearance. They do not project appreciably from the surface of the kidney. They 

 are distinctly lobulated and marbled with blood-vessels. 



VOL. XIV. — PART III. No. 3. — A^Jril, 1897. I 



