Test-fig. 4. 



Ft- 



O 



o 

 "o" 



6 



o 





o 1 





D 









6 



QO .. 





a.-.. 





o \ 





o 



7 



o ! 





o = 



8 



o ] 





1 





o^ 



9 



o ^ 





..OO--..: 





3 





^ 



10 



] 





o ■ 





o--- 



= 

 ^ o 





11 



Uo. : 





,.-o ^ 



12 



;;-0 





o"o i 



mj^ 



"" "o 





o 4 



13 









■•0-0-- ■■= 





o 1 



14 



o 



o-j 



ta 



-'0' 



o 



o 



18 



o 



O o 



o = 



o 



O 



D' 



o 



18 O" 



...o- 



o 



ao 



O 



o 



21 O 



o.. 



o 

 o 



o ] 



O ] 



o 



33 o J 



o ] 



-D -;2 



64 O ] 



6 



26 



J 



26 ^o 



27 O 

 O 



■"o"' 

 o 



28 



....cP.. 



o 



29 



o 



30 



o 



O 



32 



.....Q... 



33 O 

 O- 



34 



35 



o 

 o 



9... 

 o 



o 



37 



o 



38 



o 



c- 



40 O 



1 



o 



41 O = 



o 



43 O 



.i.i. 



-•m.eps; 

 --Sid 



Diagram of kidney-system of larval Polypte'rus. 

 Projection from transverse sections of entire pronephros and mesonephros of the right side of the larva 

 of the female Polypterus, X 60. The pronephros is a dorsal view of the same reconstruction as that 

 figured in PI. XXXIV. fig. 9. 



gl. Glomus of pronephros. 

 conv.pn. Convoluted pronephric duct. 

 nsph. Nephrostome. 



v.pr. Position of ventral process marking 

 the metameres. 

 Tc.t. Kidney-tubule. 



VOL. XVI. — PART VII. No. 3. — October, 1902. 



m.cps. Glomerulus. 

 m.eps.a. Accessory glomeruli formed between 

 the original glomeruli and the seg- 

 mental duct. 

 s.d. Segmental duet. 

 M.S. Urinary sinus. 



3b 



