bulletin: museum of comparative zoology. 



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FiGORKS I-N. 



Six diat;rammatic figures to show the relation, at various stages, of the Miillerian evagi- 

 nations, epithelial bands, and nephrostomes to the divisions of the body cavity in Am- 

 blystoma. A parasagittal cut, to the right of the stomach, exposes the body-wall. 

 The head is to the left. 



In Figure / the epithelial band from the first nephrostome is being deflected caudad by 

 the growth of the shelf {tab.), which is destined to divide the upper portion of the body 

 cavity into a glomerular and sub-glomerular cavity. (See opposite pnge.) 



