Hall. — Mesonephros in Amphibia. 



PLATE 5. 



All figures are of cross-sections, 64-64 of Amblystoma ; 65-67 of Rana. 



Figs. 54-64. Larva X. Eleven figures showing the relation between the Miillerian 

 and Wolffian ducts. Figures 64 to 03 represent consecutive sections, 

 of which 54 is the most anterior; Figure 64 a section considerably 

 posterior to that of Figure 63. X 420. 



Fio. 65. Through the common nephrostome of the right side of a larva 25 mm. 

 long. X 56. 



Fig. 66. Through the common opening of the first and second nephrostomes of 

 the right side of a larva 87 mm. long, showing the first (first -f 

 second?) Miillerian evaginations. X 105. Note. — By an oversight 

 the nuclei of the tubules in Figs. 66, 67, are left unshaded. 



Fig. 67. A section immediately anterior to the third nephrostome of the right 

 side of the larva of Figure 66, showing the fundament of the second 

 (third'? ) Miillerian evagination. X 195. 



