238 
Dr. Kidd on the 
legs are remarkable for their size, and apparently fill nearly 
the whole of the interior of the thorax. Some muscles, as 
is the case with two belonging to each mandible, and with 
some of those that are situated within the thigh of the hind 
leg, have tendons attached to them of considerable extent 
and strength. I must not omit to mention several parallel 
muscular bands, which run in a longitudinal direction along 
the outer coat of the extremity of the great intestine, and are 
inserted into what may be called the sphincter of the rectum : 
these muscular bands may evidently assist, by their previ- 
ous contraction and subsequent relaxation in discharging 
that foetid matter, which as has been already said, the animal 
usually emits when irritated. For the discovery of these 
muscles I am indebted to Mr. Whessell, whose name I have 
before mentioned on a similar occasion. 
The nerves.* In removing the integuments throughout the 
whole length of the lower surface of the body, we discover 
a series of nine ganglions, of a pale cream colour, distributed 
at unequal intervals from the commencement of the esophagus 
to the termination of the rectum ; a double medullary cord 
being continued from one ganglion to another throughout the 
whole series. The ganglions and their connecting cords lie 
so nearly in contact with the common integuments, that 
great care is requisite, lest, in removing these integuments, 
the nerves themselves should be removed, or at least injured. 
The first of these ganglions, reckoning from the anal extre- 
mity of the abdomen, is globular in its form ; and is situated 
between the intestine and the sexual organs, the latter being 
placed immediately under the ventral integuments. This 
* Vide fig. 1 1 and 12 , 
