No. 641] TRANSFORMATION OF SEX 



characters become reduced and mostly disappear com- 

 pletely. In Fig. 6 we have a transverse section through 

 a larval hermaphroditic gland. As in the young ovary 

 (Fig. 3) the distal part contains ovocysts with ovocytes 

 in the synizesis stage, and in the sex cord is found the 

 second gonad cavity or ovarial sac. But the transforma- 



epitheliuni. These germ cells after their entrance into 

 the sex cords are to be called spermatogonia. 



After the metamorphosis the whole female germinal 

 epithelium undergoes degeneration (only the peritoneum 

 is preserved) wiiile the central testis anlage develops into 

 a normal male gonad. 



Sometimes great irregularities are ol)served. Tt occurs 

 occasionally that one gonad undergoes the traii<fonna- 

 tion of sex earlier than the other in conscMiuctice oi' wliich 

 such animals pass through a stage of lateral lierinnphro- 

 dism. Such cases have often been described and are, I 

 believe, of the greatest interest with regard to the devel- 

 opment of somatic sex characters. But even within the 

 same gonad differences can be found. Sometimes the 



