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different form, applied on the mouth, and divided into two 
branches, the exterior of which has the form of a little an- 
tenna, composed of a peduncle, and a setaceous, and many- 
articulated stem. It has been compared to a whip, (palpus 
fiagelliformis ) . The two anterior feet, sometimes even the 
two or four following ones, are in the form of talons. The 
last articulation but one is dilated, compressed, and in the 
form of a hand. Its inferior extremity is prolonged into a 
conical point, representing a sort of finger, opposed to another, 
formed by the last articulation, or the tarsus proper. This 
last is mobile, and has received the name of thumb ( pollex ) 
the other, or the one which is fixed, is thought to be the 
index . These two toes are also called mordentes . The last 
is sometimes very short, in the form of a simple tooth, 
and the other folds underneath. The hand, as well as the 
fingers, will form for us the forceps, properly so called. The 
preceding, or antepenultimate articulation is denominated 
carpus . 
The respective proportions, and the direction of the loco- 
motive organs are such as to enable these animals to walk 
sideways or backwards. 
Except the rectum, which opens at the end of the tail, all 
the viscera are enclosed in the thorax, so that this portion of 
the body represents the thorax and abdomen of the insects. 
The stomach, supported by a cartilaginous skeleton, is armed 
internally with five osseous, and denticulated pieces, which 
complete the mastication of the aliments. We may see there, 
at the time of moulting, which occurs towards the end of 
spring, two calcareous round bodies, convex on one side, and 
plane on the other, which are vulgarly called crab's eyes , 
which, as they disappear after the moulting, give grounds to 
presume, that they furnish the matter for the renovation of the 
testa. The liver consists of two large clusters of vessels, 
closed at one end, and filled with a bilious humour, which they 
