Plate VI.
CRUSTACEA
| 1. Gonoplax angulata | 3. Portunus puber |
| 2. Xantho florida | 4. Polybius Henslowii |
| 5. Porcellana platycheles | |
The remaining division of the crabs—the Cyclometopa or Round-fronted Crabs, contains the larger number of species that may truly be described as common objects of the shore, for while some of them are well adapted for swimming, and live in the open water, the majority inhabit the shore, either between or just beyond the tide-marks, roaming about more or less freely when in the water, but usually hiding under stones or weeds, or burrowing into the sand, when left behind by the receding tide.
Fig. 218.—The Common Shore Crab (Carcinus mænas)
The members of this tribe may be known at sight by the form of the carapace, which is wide and rounded in front, and narrowed behind.