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 directed sterno-coxal or maxillary process, the coxæ of the second leg meeting each other in the middle line in front of the prosomatic sternum, and sending forwards these processes, which are in contact throughout their length, to

underlie the mouth. The coxæ of the third and fourth legs, on the contrary, are devoid of sterno-coxal processes, and are separated from each other in the middle line by the sternal plate, against the sides of which they abut.