These are the details of the exuviation of the Lobster whose cast-off shell is before the Society.
These are, I believe, the only two instances in which the exuviation of the Lobster has been actually witnessed; but there exist specimens of sloughs which are entirely in keeping with this description.
In the only examples of the exuviation of macrourous Decapod Crustaceans, there exists a singular diversity in the process itself.
The most remarkable fact concerning this part, is that the outer tunic, together with the calcareous scales with which it is covered, is moulted at each successive period of exuviation and growth.
After the exuviation of the larval integuments, and when calcification commences, the first layer of shell is deposited under, and then round these primordial valves.
This is effected in a singular manner by the exuviation of the great compound eyes, which we have seen are fastened to the outer arms of the double = deg.
I may remark that one, or more commonly two or three branched filaments stand nearly in the centre of each circular line of exuviation or splitting.
After the exuviationof the old spines, the new spines have their inverted basal portions drawn out from within the segments, and turned outside in, so as to assume their proper positions.
The little bristles above alluded to, which arise from the slips of membrane left adherent on the opercular valves, sheath, and walls, stand in rows; a row corresponding to each period of exuviation of the opercular membrane.
At the period of exuviation the opercular membrane separates just outside this modified portion, leaving the latter adherent, as a rim or slip, on the valves.
The hibernating season is spent in holes in walls or at the root of trees, often under manure-heaps, and the awakening occurs in March or April, soon to be followed by the firstexuviation and the pairing.
At eachexuviation one bell-shaped horny piece is added.
After the defective shell had subsisted eighty-six days, its tenant meantime feeding readily, the desired event took place in a new exuviation on 23d June.
One of his last communications to the public, imparted with all the modesty and simplicity of true genius, at the last meeting of the British Association in Edinburgh, was on this subject of the exuviation of the crustacea.
During every successive exuviation in this embryo state they assume more and more of their perfect and established form.
Previous to the change, the animal almost ceases to feed, and becomes rather inactive; the proper time having at length arrived, exuviation is effected in the course of a few hours, body and limbs being alike relieved from their hard covering.
I preserved this mutilated object with uncommon care, watching it almost incessantly day and night: expecting another exuviation which might be attended with interesting consequences, I felt much anxiety for its survivance.
About a month after this exuviation the animal perished accidentally, having been two years and eight months under examination.
During every successive exuviation in this embryo state, they assume more and more of their perfect and established form.
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