Note 1 — Chapter I · THE NATURAL HISTORY OF THE COMMON CRAYFISH (Astacus fluviatilis.)
Reading edition
If crayfish are not to be had, a lobster will be found to answer to the description of the former, in almost all points; but the gills and the abdominal appendages present differences; and the last thoracic somite is united with the rest in the lobster. (See Chap. V.)