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I.When one of the supra-œsophageal commissures is divided , the whole body of the crayfish on the injured side is more or less enfeebled, with he exception of the swimmerets and possibly the gnathites. The change is most marked in the antennæ and eye-stalks, which barely respond to considerable excitation; and after these perhaps in the abdomen, the power of swimming or turning over being generally entirely lost. The muscles connecting the abdominal segments on the injured side are relaxed, and the tail-fin appendages on that side are no longer spread out in the normal manner, but remain more or less overlapping and hang down like broken limbs.

I. Observations on the physiology of the nervous system of the crayfish (Astacus fluviatilis)