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anatomy of the mole-cricket, 
bably for this purpose, that its upper part is furnished with 
several projecting papillae, each terminating in a small horny 
particle ; which, like the sesamoid particles in the semilunar 
valves of the human aorta, may serve to complete the val- 
vular action of the papillae to which they are attached. 
The caeca which have been above described, are traversed 
longitudinally by several very broad duplicatures of their 
internal membrane ; and judging from their usual contents, 
these appendages of the intestine are destined to receive and 
to perfect the digestion of those particles of food from which 
the gizzard has pressed out the liquid contents ; and while, 
by means of the membranous folds already described, the 
expressed fluid is conveyed immediately into the mouth of 
the intestinal canal that passes from the general caecal cavity, 
the caeca themselves receive the solid compressed particles 
which are forced out laterally at the extremities of those two 
divisions of the gizzard, which, having no membranous fold 
attached to them, leaves thus a vacant interval for the pas- 
sage of the undigested mass. That this opinion is correct 
may be presumed, not only from the very mechanism of the 
parts, but from the state of the contents of the caeca, which 
are of a less crude character than the contents of the crop, 
and of a more crude character than the contents of the por- 
tion of intestine immediately beyond them. A strong con- 
firmation of the foregoing opinion is obtained from a compa- 
rison of this part of the anatomy of the mole-cricket, with 
that of the corresponding part in the ostrich ; the stomach of 
which bird, acting like a gizzard by means of numerous peb- 
bles which it takes into that organ, is aided by two enormous 
caeca, which, though they are not immediately in contact 
