Plate XVII.— Histology of the earthworm. 



3 first hank of the nephridium (Fig. 142); A' t part o 

 t of a transverse section of the body. 



i.v,, Blood vessel ; gl.c, gland cell in the epidermis. Other letters as in Fig. 142 (A and 

 A') and Fig. 136 (B). B 



A, The end of the first hank of the nephridium (Fig. 142); A', part of a section of the 

 same ; B, part of a transverse section of the body. 



