DEVELOPMENT OF THE FAT-BODIES IN RANA TEMPORAPJA. 131 



DESCRIPTION OF PLATE IX. 



Illustrating Mr. A. E. Giles's Paper on " The Development of the 

 Fat-Bodies in Eana Temporaria." 



The letters have the same significance in all the figures, b. Muscles 



of body wall on the ventral aspect of the vertebral column. /. 



Fat-body. g. Genital organ (sex undifferentiated), k. Kidney. 



n. Noto chord. 



Fig. 1. Tailed frog, dissected so as to expose the urinogenital organs. 

 The kidneys are seen lying against the vertebral column, 

 and continuous anteriorly with the fat-bodies. Anterior 

 and internal to the kidneys are the genital organs (x 4). 



Fig. 2. Anterior end of the urinogenital organs of the tailed frog- 

 shown in Fig. 1, enlarged. The right half of the figure 

 shows the surface view, the left half shows the appear- 

 ance in horizontal section (x 50). 



Fig. 3. Normal pronephric tubule, from a tadpole still possessing 

 external gills (x 350). 



Fig. '4. Pronephric tubules showing fatty degeneration, from a tad- 

 pole whose hind limbs were just appearing ( x 350). 



Fig. 5. Transverse section through the lumbar region of a tailed 

 frog, showing the mode of development of the genital 

 organs and their relation to the excretory organs at this 

 stage ( x 50). 



Fig. 6. Sagittal section through the lumbar region of a tadpole that 

 had recently acquired its fore limbs, showing the anterior 

 end of the nephros partly degenerated ( X 60). 



Fig. 7. Sagittal section through the lumbar region of a tailed frog 

 whose tail had begun to be absorbed, showing the fat- 

 body connected with both kidney and genital organ 

 (x 60). 



Fig. 8. Sagittal section through the lumbar region of a young frog 

 that had just lost its tail (x 60). 



Fig. 9. A young frog at the same stage as the preceding, dissected 

 so as to expose the urinogenital organs, which present 

 the same condition as in the adult (x 4). 



