Fig. 5. Section through the ureters, the WolflBan duct and the oviduct 

 of a female embryo of Scy. canicula belonging to stage P. Zeiss B, ocul. 2. 



Fig. 6. Section of part of the Wolffian body of a male embryo of Soy Ilium 

 canicula belonging to stage O. Zeiss B, ocul. 2. 



The section illustrates (1) the formation of a Malpighian body {mg) from 

 the dilatation at the end of a segmental tube, (2) the appearance of the 

 rudiment of the Miillcrian duct in the male {od'). 



Figs. 7 a, 7 b. Two longitudinal and vertical sections through part of 

 the kidney of an embryo between stages L and M. Zeiss B, ocul. 2. 



7 a illustrates the parts of a single segment of the Wolffian body at this 

 Ktage, vide p. 261. The segmental tube and opening are not in the plane of 

 the section, but the dilated vesicle is shewn into which the segmental tube 

 opens. 



7 & is taken from the region of the kidney proper. To the right is seen 

 the opening of a segmental tube into the body-cavity, and in the segment to 

 the left the commencing formation of a ureter, vide p. 272. 



Fig. 8. Longitudinal and vertical section through the posterior part of 

 the kidney proper of an embryo of Scyllium canicula at a stage between 

 N and O. Zeiss A, ocul. 2. 



The section shews the nearly completed ureters, developing Malpighian 

 bodies, &c. 



Fig. 9. Longitudinal and vertical section through the anterior part of 

 the kidney proper of the same embryo as Fig. 8. Zeiss A, ocul. 2. 

 The figure illustrates the mode of growth of the developing ureters. 

 9 A. More highly magnified portion of the same section as Fig. 9. 

 Compare with transverse section Fig. 4. 



Fig. 10. Longitudinal and vertical section through part of the Wolffian 

 body of an embryo of Scyllium canicula at a stage between O and P. 



The section contains two examples of the budding out of the vesicle of 

 a segmental tube to form a Malpighian body in its own segment and to 

 imite with the tubulus of the preceding segment close to its opening into 

 the Wolffian duct. 



