78 JT. M. ESSENBERG. 



EXPLANATION OF PLATES. 



All the drawings have been made with the aid of an Abbe Camera. The 

 lenses used were of Zeiss make and the magnifications follows the description 

 of each figure. 



PLATE I. 



FIG. i. Transverse section of indifferent gonad of a specimen 9 mm. in 

 total length. X 1000. 



FIG. 2. Transverse section of an early normal ovary. X 1000. 



FIG. 3. Transverse section of an indifferent gonad of an embryo 3.2 mm. 

 total length. X 1000. 



Symbols : 



be Binucleated germ cell. 



ee External epithelium of gonad. 



In Labulated nucleus of germ cell. 



m Mesentery. 



mo Mesovarium. 



p Peritoneum. 



pc Peritoneal cell. 



pgc Primordial germ cell. 



re Red blood cell. 



yg Yolk globules. 



