56 ME. SWALE VINCENT ON THE 



Many of the suprarenals are of exceeding minuteness, even less than 1 mm. in 

 diameter, and these are seen in large numbers from the interior of the posterior 

 cardinal sinus, whence they appear like " tubercles " in the wall of this vessel ; indeed 

 the appearance of these tiny bodies as seen through the lining epithelium of the vein 

 is almost identical with the caseous nodules of pathology. In the two specimens I 

 have examined the large suprarenals were arranged in two very irregularly symmetrical 

 groups just behind each " head-kidney." ^ Each group consisted of about a dozen, 

 and all of them were in close proximity to the venous sinus (PI. X. fig. 8). 



Some of the suprarenals lying on the posterior surface of the kidney were flattened, 

 almost wafer-like. 



The bodies I have seen varied in size from about 1 mm. in diameter to something 

 under 1 cm., but measurements are diiflcult as their shape is often so irregular. They 

 have a decidedly fatty appearance to the naked eye, and on being placed for a few 

 hours in a 5 per cent, solution of osmic acid they become quite black, so that the 

 presumption is that they contain some material of a fatty nature. 



I have not been able to make out any very intimate relations between the 

 suprarenals and the sympathetic nervous system in the Sturgeon, but I find that in 

 many cases the bodies are placed on blood-vessels which are running in the kidney- 

 substance. 



3. TELEOSTEI. 

 a. Plectognathi. 



In the tribe Sclerodermi I have only been able to obtain a small spirit-specimen of 

 Balistes maculatus. It was not in a good state of preservation, and the results were 

 negative. 



In the Gymnodontes I have examined the Sun-fish [Orthafforiscus mola) as a 

 representative of the Molidaj and Tetroyon nigropunctatus among the Tetrodontidse. 

 The last was an ill-preserved specimen and nothing was found. The following is the 

 arrangement in the Sun-fish : — 



MoLiD^. — In a specimen of Orthagoriscus mola (Pi. X. fig. 9, s.r.), 70 cm. in 

 length, with kidneys of 20 cm. in length, I found one suprarenal only, which appeared 

 to belong to the right side (PI. X. fig. 9, s.r.). It was kidney-shaped, whitish, and 

 fatty-looking, but of firm texture, and was about 1 cm. long by about 5 mm. broad. 



h. Phtsostomi. 

 MuE^xiD^. — In this family I have investigated both the Conger and the Silver Eel. 

 There are two suprarenals in both species; these are in Conger conger (PI. X. fig. 10, 

 s.r.) triangular with rounded corners, in Anguilla anguilla round or oval in shape. 

 Their position is peculiar in that they lie very anteriorly, being not far behind the 

 point where the two crura of the kidney unite (PI. X. fig. 10, s.r.). They are situated 



' [In some cases they extend into the lymphatic tissue. — S. V., 10. 1. 97.] 



