Explanation of the Plates. 



Reference-Letters common to all the figures. 



ad., adenoid tissue of kidney between the tubules; al.TV., walls of alveoli; 

 bid. c, blood-corpuscles; ca., capsule; c. sp., central space in alveoli; d. c, cells 

 resembling "demilune" cells; co., cortex; e.c, elongated cells; n. , nuclei; n.c., 

 nerve-cells; n.net., nuclear network; nl., nucleoli; k.t., kidney tubules; p.c., bran- 

 ched pigment cells; pr., granular protoplasm; me., medulla; s., septa; str., fibrous 

 stroma. 



PI. XVL 



Fig. 1. Portion of central part of paired suprarenal body from the middle region 

 of the animal (Raja clavata), shewing branched chromogenic cells, as 

 seen under a magnifying power of 480 diameters. 



Fig. 2. Part of peripheral zone of paired suprarenal body from the middle region 

 of the animal fScyllinm canicula) shewing columnar cells. Same magni- 

 fication as preceding fig. 



Fig. 4. Section through a small portion of the interrenal body of Raja clavata. 

 As seen under a magnifying power of 480 diameters. Outlines drawn 

 with the camera lucida. 



Fig. 5. Section taken through portions of kidney and suprarenal body of Conger 

 conger, shewing the intertubular adenoid tissue of the kidney with tubules 

 here and there, and the general structure of the suprarenal body as seen 

 under a low power. 



Fig. 6. From same slide as preceding, shewing the detailed structure of the 

 suprarenal vesicles. Outlines drawn wdth camera lucida. 



Fig. 7. Section of small portion of suprarenal body of Salmo trutta. Seen 

 magnified 480 diameters. Compare with fig. 4. 



Fig. 12. From same slide as preceding. To shew cortical cell columns and 

 medullary masses of cells. Higher power. 



PI. XVII. 



Fig. 8. Section of external portion of the suprarenal body of Orthagoriscus 



mola. Low power. 

 Fig. 9. From same slide as preceding. Higher power. 



