INFLUENCE OF ENVIRONMENT ON SEX 



235 



TABLE 6 



Neuter Crepidulas returned to hermit's shells similar to those ivhich they formerly 

 occupied, i.e., without large female individuals. Sectioned after thirty-four 

 days. Specimens from, each colony listed together. Suminary of results: with 

 adult testis, 3; testis to spermatids, 2; testis to sperm,atocytes , 1; with spermato- 

 gonia only, 11; sexually inactive, 5; with oogonia, 2. Total 24 



Hermit 1 



None 

 None 

 None 

 None 



None 



None 

 Short 



Many primordial egg cells 

 Many primordial egg cells 

 Small; few spermatogonia 

 Spermatogonia, degener- 

 ating 

 Spermatogonia, degener- 

 ating 



Spermatogonia 

 Small adult testis 



Undifferentiated 

 Undifferentiated 

 Undifferentiated 

 Undifferentiated 



Proximal part somewhat 

 wider and slightly 

 twisted 



Undifferentiated 



Small seminal vesicle with 

 a few sperm 



Hermit 2 



Hermit 3 



216 



217 



None 

 None 



Inactive 

 Inactive 



Slightly widened proxi- 



mally 

 Undifferentiated 



