108 J ROCEEDIXGS OF THE ACADEMY OF [Feb., 



nearly ready to imdergo transformation, though several well pre- 

 served and stained series were examined, it seemed possible that this 

 gland might have been developed from the anterior part of the 

 larval thyi-oid, or from the pair of deep ciliated grooves which run 

 forward from the opening of the thyroid and which are not present, 

 as such, in the adult condition. 



The similarity in the secretion and function of the larval thyroid 

 to the secretion and function of a salivary gland seems to support 

 this view. 



The author hopes, with the aid of proper material, to be able to 

 prove definitely whether or not there is any relation between the 

 larval thyroid and the salivary gland of the adult Petromyzon. 



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