HALL: MESONEPHROS AND MULLERIAN DUCT IN AMPHIBIA. 125 



toe. eUh. a 



tae. e'th. 



tae. e'th. y 

 tae. e'th. y' 



Thickened epithelial 

 band from the an- 

 terior evagination. 

 Tliickened epitlielial 

 band from the pos- 

 terior evagination. 

 I'The band posterior to 

 the fusion of por- 

 tions a and ;8. That 

 which is dorsal to 

 the shelf is desig- 

 nated by y, that 

 ventral by y'. 



tbl. ms'nph. . 

 thl. nph'stm. . 

 tbl. pr'nph. 1, 2, 



trn. clg. 

 trt. in. . 

 va. sng. 

 vst. nph. 



. Mesonephric (inner) 

 tubule. 



. Nephrostomal (outer) 

 tubule. 



3 First, second, and 

 third pronephric 

 tubules. 



. Collecting trunk. 



. Alimentary tract. 



. Blood-vessel. 



. Nephrostomal vesti- 

 bule or common 

 nephrostome. 



NO. 2 



