EXPLANATION OF PLATE VI, 



Illustrating Mr. K. Mitsukuri^s Paper on the '' Develop- 

 ment of the Suprarenal Bodies in Mammalia." 



Explanation of Figures. 



The outlines of all the figures, except Fig. 10, are drawn with Zeiss's 

 obj. A and camera lucida with eye-piece 4, and then reduced one-third, 

 except Fig. 1. Fig .10 is drawn with Zeiss's obj. a and the same camera 

 lucida. 



General Letters of Reference. 



Ao. Aorta, c. Cortical part of the suprarenal bodies, ch. Notochord. 

 m. Medullary part of the suprarenal, n. Peripheral sympathetic part with 

 ganglion cells, p. Peripheral sympathetic part without ganglion cells. 

 p.p. Body cavity, s.r. Suprarenal bodies, si/mp. Sympathetic cords, 

 t? .Viens. v.c. Cardinal veins, v.c.i. Vena cava inferior. W.b. Wolffian 

 body. 



Fig. 1. — A part of the transverse section of the adult suprarenal body ot 

 the rabbit. 



d. Capsule, a. The outermost zone of the cortex, b. Zona fasci- 

 culata. c. Zona reticulatis. w. w. Blood-cavities. 

 Fig. 2. — A longitudinal section of the posterior end of the adult supra- 

 renal body of the rabbit. The upper end of the figure is posterior. 



a. Cells like ganglion cells, b. A place where one of the irregular 

 cords of cells taper and seem to pass off into nerve fibres, d. Blood- 

 capillaries, g. Ganglion-like mass. i. Blood-vessel. y. Nerve- 

 bundle. 

 Fig. 3. — Section from a rabbit embryo twelve days old. 

 Fig. 4. — Section from a rabbit embryo fourteen days old. 



g. Germinal band. 

 Fig. 5. — Section from a rabbit embryo sixteen days old. 



a. Nervous fibres given off from the mass n. 



Fig. 6. — Section immediately behind that represented in Fig. 5 from the 



same embryo. 

 Fig. 7. — Section of the right suprarenal from a rat embryo 23 mm. long. 



b. Nervous bundles entering the suprarenal. 



Fig. 8. — Section of the suprarenal from an embryo rabbit twenty-six days 

 old, near the middle of the organ. 



Fig. 9. — Ditto, near the posterior end. The outer part of the suprarenal 

 is torn away. 



a. Nervous bundle. 



Fig. 10. — Series of diagrammatic longitudinal sections of the suprarenal 

 from an embryo rabbit twenty-four days old. 



A is the furthest from and D the nearest to the median axis of the 

 body of the embryo. Between A and B there is one section. B and 

 C are consecutive. Between C and D there are two sections. In 

 each figure the upper end is anterior and the right side dorsal. 



