Susanna Phelps Gage 



431 



TABLE IL 



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 15 -^ 



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Notes on the Total Folds. 



Albicantial. — In early stages of the chick and amblystoma, the first 

 folds to form in the cephalic region before the neural plates close, is this 

 pair lying at either side of a middle piece which is molded over the 

 cephalic tip of the blind cephalic end of the enteron. This connection 

 is soon lost, a great mass of mesoderm filling the cephalic bend, and 

 intervening between the albicans and the pharynx (Fig. 3, 4). The 

 prominence of these folds in this specimen (Figs. 9, 16) is especially 

 marked. In mammals, they seem to decrease in relative prominence as 

 the gill region begins to transform. 



In many studies which have been made of the brain, a fold from the 

 infundibular region is shown to extend entirely across the brain tube to 



