a radial depression extends from the beak to the anterior ventral margin, which it slightly emarginates;

For producing this velocity of motion we have a peculiar advantage, in having a double energy always at command, as half our crew are at rest always in the ordinary course of things, which, on particular emergencies, as in the instance of being chased by an enemy, may prove the salvation of the ship, cargo, and crew: not only may the whole muscular power of the crew be employed mechanically, in waorking the wheels of hydraulic engines ; but the different sets of muscles belonging to each man may be alternately employed and relieved by working them both pedally and manually, through the means of cranks, winces, and ropes.

The study of fluid dynamics quantifies turbulent and laminar flows.

Coordinate term: open carry