76 MEMOIRS OF THE CARNEGIE MUSEUM 
(Xs) 
Neville Island, (collected by D. A. Atkinson, May 14, 1899, Cat. No. 74. 36). The 
claws are intermediate between male and female, but inclining toward the male 
form. ‘The third pereiopods have strong and well developed hooks on the ischio- 
podites of the type of the first form male. The first pleopods are very peculiar, 
(Plate XXXIX, Figs. 7d and 7e), and unlike those of C. obscwrus; they rather 
resemble those of C. limosus. Their length and strength are normal, but there is no 
shoulder, and the two parts are separated only for a short distance at the tips, similar 
to C. limosus, but the tips are not twisted. The outer tip is horny and pointed, the 
inner soft, thicker, and tapers to a blunt point. The second pleopods are of the 
normal male type. In addition this individual possesses a well developed annulus 
ventralis, and sexual orifices only on the third pereiopods. Thus it appears to be a 
female, with the secondary sexual characters of the male well, but not specifically, 
developed. 
None of the two cases of apparent hermaphroditism just described (Nos. 3 and 4) 
agrees with any of the four cases mentioned by Faxon, (1885a p. 13, 14), or the four 
described by Hay, (1905, p. 226 and 227). Additional cases will be described below 
under C. bartoni. There is in the Carnegie Museum a further individual of herma- 
phroditic character, namely a specimen of Cambarus rusticus Girard, from the 
Wabash River, Bluffton, Indiana, collected by Mr. E. B. Williamson, June 1, 1905, 
Cat. No. 74. 578. I append a description of it. 
The specimen is externally a female, possessing the female type of claws, a well- 
developed annulus, female sexual openings, and no hooks on the third pereiopods. 
But the first pleopods are peculiar; they are short and stout; the bases are iden- 
tical with those of the male pleopods; the distal parts, however, reach only to 
about the middle of the coxopodites of the fourth pereiopods; their tips are soft, 
blunt, and slightly curved inward, and possess the furrow which divides them into 
an outer and inner part, but these parts are not separated at the tips. The second 
pleopods are of the female type. This case corresponds in a certain degree to the 
second, third, and fourth, mentioned by Faxon, chiefly so to the third (in C. diog- 
enes). The specimen is apparently a normal female, only the first pleopods are 
transformed in a peculiar way, resembling the male type generally, but differing 
from the specific shape. In the present case the first pleopod is different from 
Faxon’s case in detail. 
