266 C. L. TURNER. 



almost as large as those of a male but were lacking the charac- 

 teristic, recurved hooks. 



The fourth specimen, a female of Cambarus pro pin guns, 72 mm. 

 long, was normal wi t h the exception of the first abdominal append- 

 ages. These were modified so as to be almost identical with but 

 slightly smaller than those of the male. 



Hay (1905) in examining the collection of crayfishes in the 

 U. S. National Museum which had been made by the U. S. Fish 

 Commission and by himself found four additional specimens 

 which showed evidence of hermaphroditism. 



In the first specimen, Cambarns spinosns, the organs internally 

 and externally were those of a female with the exception of the 

 annulus ventralis which was rather small. In addition there 

 were the following male secondary sexual characters: hooks on 

 the base of the third walking legs, abdominal appendages 

 modified as in the male but slightly undersized, genital papilla at 

 the base of the fifth walking legs, but no genital pores. 



The second specimen, also Cambarns spinosus, was identical 

 with the first with the exception of the first abdominal appendages 

 which w r ere shorter. 



The third case, a specimen of Cambarns propinquus, 53 mm. 

 long, displayed a preponderance of male secondary sexual charac- 

 ters on the left side and of female characters on the right side. 

 The right side had the usual genital pore of the female at the base 

 of the third walking leg, a small abnormal appendage on the first 

 abdominal segment and the usual second abdominal appendage 

 of the female. The annulus ventralis was also well developed. 

 On the left side there was no female genital opening at the base 

 of the third walking leg but on this third leg there was the copu- 

 latory hook normally found in the male. The first and second 

 abdominal appendages of the left side were those of a normal male 

 and at the base of the fifth walking leg there was the genital pore 

 of the normal male. Nothing of the internal structure could be 

 made out. 



The fourth case appeared in a specimen of Cambarns affinis, 

 1 06 mm. long. Externally it had all the characters of a male 

 except that it had no opening for the sperm duct at the base of the 

 left fifth walking leg. It did have, li"\vrvrr, the genital openings 



