8 4 



.MARY |. ROSS. 



yolk disappears from them first, hence there is little space left for 

 the formation of excretory ducts. The glands, then, are shorter 

 and more flask-shaped than in the Desmognathus, though here 

 too are found simple tubular glands. 



Bensley ('oo) describes the gastric glands of Amblystoma as 

 "tubular downgrowths " of entoderm. "The anterior glands," 

 he says, " are of a flask like shape and have a distinct lumen." 



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lr^?, : Wrn^^Jawj 

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FIG. 21. a., the gland fundament has increased in size very rapidly and now has 

 a central lumen ; d. , the duct has not developed to a corresponding extent, being as 

 yet only a shallow pit ; ep. , the epithelial cells are becoming radially arranged around 

 the gland fundament as an axis ; /. , central lumen ; y., the yolk is still present in the 

 epithelial cells of the surface, though it has almost disappeared from the gland cells. 

 Obj. T ' s , Oc. 2. 



" The posterior glands are simple tubes, composed of a simple 

 layer of yolk-filled cells surrounding a cleft like lumen." From 

 the glands described and figured by Bensley it seems probable 

 that the "cleft like lumen," with the nuclei arranged as if sur- 



