338 
Fig. 2. Charon grayi from Palau. Male, above; 
female with egg-sac, below. Photo by the author. 
particular specimen has only seven eggs in a 
single layer in the sac, which measures 7 mm. 
across. A Javanese specimen 25.5 mm. long, 
in my possession, has more than 80 eggs in 
several layers in a sac 14 mm. long. An egg 
of the Javanese specimen is larger than one 
PACIFIC SCIENCE, Vol. IV, October, 1950 
of the small Micronesian adults which I have 
just mentioned. I consider that the diminu- 
tive adult 7 mm. long, which looks like a 
juvenile at first glance, is already matured, 
and that the animal grows to a larger size, 
even to the size of the Javanese specimen, as 
it lives and reproduces. One other specimen 
from Koror measured only 6 mm. long but, 
inasmuch as it shows the secondary sexual 
characters stated above, it must be concluded 
that it is a female. 
In this present contribution I have not 
mentioned the body length, width of cara- 
pace, and second abdominal sternum, which 
also contribute to determining the secondary 
sexual characters of this species, but the de- 
scription I have given suffices to distinguish 
the sexes. 
REFERENCES 
Esaki, T. 1936. Das Vorkommen der cha- 
rontiden Amplypygi auf den Palau-Inseln. 
Lansania [Tokyo] 8(75): 79-80, 1 pi. 
Kano, T. 1937. On the cave fauna of Botel 
Tobago, Formosa. [In Japanese.] Zool. 
Mag. {Tokyo} 49(3/4): 90. 
