PLATE 



EXPLANATION OF FIGfRES 



36 Section pronephros of Myxine no. 15 which shows a broad band of connec- 

 tive tissue extending from the base of the tubules into the pronephric vein. 

 Camera, X 50. 



37 Transverse section through a degenerated Malpighian body immediately 

 posterior to the left pronephros Myxine no. 15. Camera lucida, X 90. 



38 Transverse section through a degenerated Malpighian body immediately 

 posterior to the left pronephros of Myxine no. 11, with a blind tubule beside it. 

 Camera, X 90. 



39 Transverse section through pronephros of Bdellostoma no. 15, showing 

 Bowman's capsule of the Malpighian body opening into the pericardial cavity. 

 Camera lucida, X 50. 



40 Transversesection through the Malpighian body of the left pronephros of 

 Bdellostoma no. 16, showing lobulated structure of the glomerulus and the open- 

 ing of Bowman's capsule into the pericardial cavity. Camera, X 90. 



150 



