243 
anatomy of the mole-cricket. 
more slender in form, also and much more convoluted, which 
apparently terminate near the points where the ducts of the 
testicles terminate. In the instances of full developement 
these bodies are enlarged to six times their usual size. 
Under the circumstances of full developement there is also 
found, though scarcely perceptible under imperfect deve- 
lopement, a large spherical mass, resembling a ball of eider 
down, situated immediately at the anterior edge of the pouch 
above described, and continued on from its substance. 
The examination of the mole-cricket has added, as appears 
from the description of the parts, another exception in the 
case of the female as well as the male to the general state- 
ment. that in insects the sexual organs pass out by the anus. 
Cuvier mentions, as the only exceptions to this law, the 
luli and libellulae.* 
Casting of the skin. The following are the only observa- 
tions I have had an opportunity of making as to this point of 
the history of the mole-cricket. In the process of moulting, 
the skin of tlie abdomen appears to split longitudinally down 
the middle of the upper part ; and the skin of the thorax 
separates in a similar direction ; but the skin of the head 
only separates partially in that direction, and then splits be- 
between the stemmata, in a direction towards each of the 
antennas ; so that the line of separation somewhat resembles 
the lambdoVdal suture of the human skull. 
The cornese of the eyes are cast with the rest of the skin, 
as in the case of the snake ; but they lose their transparency, 
and become of a greyish white colour, 
Even the covering of the claws is cast. 
MDCCCXXV. 
* Regne Animale, Tom, iii. p. 137." 
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