Plate LXXIII 



Fig. III. Camera lucida drawing of a frontal section passing through the attach- 

 ment of the third orbital gland near its cranial extremity, in the 51 milli- 

 meter embryo. Columbia Collection, No. 104, X 85, reduced to 5. 



Fig. 112. The same. Section passes through the caudal extremity of the attach- 

 ment of the third orbital gland, X 85, reduced to 5. 



Fig. 113. The same. .\ more caudal section through the body of the second orbital 

 gland, X 85, reduced to j. 



